Hydrodynamic relation in 2D Heisenberg antiferromagnet in a field (2009)
Chernyshev, A. L., Zhitomirsky, M. E.
The spin-stiffness \rho_s of a 2D Heisenberg antiferromagnet depends non-analytically on external magnetic field. We demonstrate that the hydrodynamic relation between \rho_s, the uniform...
Chernyshev, A. L., Zhitomirsky, M. E.
We present a comprehensive study of the dynamical properties of the quantum Heisenberg antiferromagnet on a triangular lattice within the framework of spin-wave theory. The distinct features of...
Melchy, P. -É., Zhitomirsky, M. E.
The classical Heisenberg antiferromagnet on a triangular lattice with the single-ion anisotropy of the easy-axis type is theoretically investigated. The mean-field phase diagram in an external...
Magneto-thermal properties of the spin-s Heisenberg antiferromagnet on the cuboctahedron (2008)
Honecker, A., Zhitomirsky, M. E.
We use the example of the cuboctahedron, a highly frustrated molecule with 12 sites, to study the approach to the classical limit. We compute magnetic susceptibility, specific heat, and magnetic...
Magnetic excitations in dipolar pyrochlore antiferromagnet Gd$_2$Sn$_2$O$_7$ (2008)
Sosin, S. S., Prozorova, L. A., Bonville, P., Zhitomirsky, M. E.
The spin dynamics in the geometrically frustrated pyrochlore antiferromagnet $\rm Gd_2Sn_2O_7$ is studied by means of the electron spin resonance. In the ordered phase ($T_N = 1$ K), we have detected...
Octupolar ordering of classical kagome antiferromagnets in two and three dimensions (2008)
Classical Heisenberg antiferromagnets on two-dimensional kagome and three-dimensional hyperkagome lattices are investigated by Monte Carlo simulations. For both models the symmetry-breaking states at...
Quantum fluctuations in high field magnetization of 2D square lattice J1-J2 antiferromagnets (2007)
Thalmeier, P., Zhitomirsky, M. E., Schmidt, B., Shannon, N.
The J1-J2 square lattice Heisenberg model with spin S=1/2 has three phases with long-range magnetic order and two unconventionally ordered phases depending on the ratio of exchange constants. It...
XY checkerboard antiferromagnet in external field (2006)
Canals, B., Zhitomirsky, M. E.
Ordering by thermal fluctuations is studied for the classical XY antiferromagnet on a checkerboard lattice in zero and finite magnetic fields by means of analytical and Monte Carlo methods. The model...
Zhitomirsky, M. E., Tsunetsugu, H.
Quantum Heisenberg antiferromagnets on pyrochlore and checkerboard lattices in a strong external magnetic field are mapped onto hard-core lattice gases with an extended exclusion region. The...
Magnetocaloric effect in pyrochlore antiferromagnet Gd2Ti2O7 (2006)
Sosin, S. S., Prozorova, L. A., Smirnov, A. I., Golov, A. I., Berkutov, I. B., Petrenko, O. A., ...
An adiabatic demagnetization process is studied in Gd2Ti2O7, a geometrically frustrated antiferromagnet on a pyrochlore lattice. In contrast to conventional paramagnetic salts, this compound can...
Magnon Decay in Noncollinear Quantum Antiferromagnets (2006)
Chernyshev, A. L., Zhitomirsky, M. E.
Instability of the excitation spectrum of an ordered noncollinear Heisenberg antiferromagnet (AF) with respect to spontaneous two-magnon decays is investigated. We use a spin-1/2 AF on a triangular...
Magnetic resonance in a pyrochlore antiferromagnet Gd2Ti2O7 (2006)
Sosin, S. S., Smirnov, A. I., Prozorova, L. A., Balakrishnan, G., Zhitomirsky, M. E.
Electron spin resonance study of frustrated pyrochlore Gd2Ti2O7 is performed in a wide frequency band for a temperature range 0.4-30 K, which covers paramagnetic and magnetically ordered phases. The...
Distorted vortex lattice in a tetrahedral superconductor (2006)
Dao, V. H., Zhitomirsky, M. E.
Equilibrium shape and orientation of vortex lattice are studied for an s-wave tetrahedral superconductor in the vicinity of the upper critical field. The phase diagram, which includes transitions...
Magnetic ordering in Gd2Sn2O7: the archetypal Heisenberg pyrochlore antiferromagnet (2006)
Wills, A. S., Zhitomirsky, M. E., Canals, B., Sanchez, J. P., Bonville, P., De Reotier, P. Dalmas, ...
Low-temperature powder neutron diffraction measurements are performed in the ordered magnetic state of the pyrochlore antiferromagnet Gd2Sn2O7. Symmetry analysis of the diffraction data indicates...
Magnetic ordering in Gd2Sn2O7 the archetypal Heisenberg pyrochlore antiferromagnet (2006)
Wills, A.S., Zhitomirsky, M.E., Canals, B., Sanchez, J.P., Bonville, P., De Reotier, P.D., ...
Low-temperature powder neutron diffraction measurements are performed in the ordered magnetic state of the pyrochlore antiferromagnet Gd2Sn2O7. Symmetry analysis of the diffraction data indicates...
Decay of quasiparticles in quantum spin liquids (2006)
Magnetic excitations are studied in gapped quantum spin systems, for which spontaneous two-magnon decays are allowed by symmetry. Interaction between one- and two-particle states acquires nonanalytic...
Effective quantum dimer model for trimerized kagome antiferromagnet (2005)
An effective spin-orbit Hamiltonian is derived for a spin-1/2 trimerized kagome antiferromagnet in the second-order of perturbation theory in the ratio of two coupling constants. Low-energy singlet...
Exact low-temperature behavior of kagome antiferromagnet at high fields (2005)
Zhitomirsky, M. E., Tsunetsugu, Hirokazu
Low-energy degrees of freedom of a spin-1/2 kagome antiferromagnet in the vicinity of the saturation field are mapped to a hard-hexagon model on a triangular lattice. The latter model is exactly...
Magnetocaloric effect in one-dimensional antiferromagnets (2005)
Zhitomirsky, M. E., Honecker, A.
An external magnetic field induces large relative changes in the entropy of one-dimensional quantum spin systems at finite temperatures. This leads to a magnetocaloric effect, i.e. a change in...
Ginzburg-Landau theory of vortices in a multi-gap superconductor (2005)
The Ginzburg-Landau functional for a two-gap superconductor is derived within the weak-coupling BCS model. The two-gap Ginzburg-Landau theory is, then, applied to investigate various magnetic...
Enhanced magnetocaloric effect in frustrated magnets (2005)
The magnetothermodynamics of strongly frustrated classical Heisenberg antiferromagnets on kagome, garnet, and pyrochlore lattices is examined. The field induced adiabatic temperature change (dT/dH)_S...
Field induced transitions in a kagome antiferromagnet (2005)
The thermal order by disorder effect in magnetic field is studied for a classical Heisenberg antiferromagnet on the kagome lattice. Using analytical arguments we predict a unique H-T phase diagram...
Interband proximity effect and nodes of superconducting gap in Sr2RuO4 (2005)
Zhitomirsky, M. E., Rice, T. M.
The power-law temperature dependences of the specific heat, the nuclear relaxation rate, and the thermal conductivity suggest the presence of line nodes in the superconducting gap of Sr2RuO4. These...
Glazkov, V. N., Zhitomirsky, M. E., Smirnov, A. I., Loidl, A., Marin, C., ...
The electron paramagnetic resonance is used to measure the single-ion anisotropy of Gd3+ ions in the pyrochlore structure of (Y{1-x}Gdx)2Ti2O7. A rather strong easy-plane type anisotropy is found....
High field properties of geometrically frustrated magnets (2005)
Zhitomirsky, M. E., Tsunetsugu, H.
Above the saturation field, geometrically frustrated quantum antiferromagnets have dispersionless low-energy branches of excitations corresponding to localized spin-flip modes. Transition into a...
Anisotropy of the upper critical field in MgB2: the two-gap Ginzburg-Landau theory (2005)
Dao, V. H., Zhitomirsky, M. E.
The upper critical field in MgB2 is investigated in the framework of the two-gap Ginzburg-Landau theory. A variational solution of linearized Ginzburg-Landau equations agrees well with the Landau...
Comment on "Order parameter of A-like 3He phase in aerogel" (2005)
Mineev, V. P., Zhitomirsky, M. E.
We argue that the inhomogeneous A-phase in aerogel is energetically more preferable than the "robust" phase suggested by I. A. Fomin, JETP Lett. 77, 240 (2003); cond-mat/0302117 and cond-mat/0401639.
Monte Carlo study of first-order transition in Heisenberg fcc antiferromagnet (2005)
Gvozdikova, M. V., Zhitomirsky, M. E.
Nearest-neighbor Heisenberg antiferromagnet on a face-centered cubic lattice is studied by extensive Monte Carlo simulations in zero magnetic field. The parallel tempering algorithm is utilized,...
Effective quantum dimer model for trimerized kagome antiferromagnet (2005)
An effective spin-orbit Hamiltonian is derived for a spin-1/2 trimerized kagome antiferromagnet in the second-order of perturbation theory in the ratio of two coupling constants. Low-energy singlet...
Effective quantum dimer model for trimerized kagome antiferromagnet (2005)
An effective spin-orbit Hamiltonian is derived for a spin-1/2 trimerized kagome antiferromagnet in the second-order of perturbation theory in the ratio of two coupling constants. Low-energy singlet...
Effective quantum dimer model for trimerized kagome antiferromagnet (2005)
An effective spin-orbit Hamiltonian is derived for a spin-1/2 trimerized kagome antiferromagnet in the second-order of perturbation theory in the ratio of two coupling constants. Low-energy singlet...
Interplay between SDW and induced local moments in URu2Si2 (2004)
Mineev, V. P., Zhitomirsky, M. E.
Theoretical model for magnetic ordering in the heavy-fermion metal URu2Si2 is suggested. The 17.5K transition in this material is ascribed to formation of a spin-density wave, which develops due to a...
Exact low-temperature behavior of kagome antiferromagnet at high fields (2004)
Zhitomirsky, M. E., Tsunetsugu, Hirokazu
Low-energy degrees of freedom of a spin-1/2 kagome antiferromagnet in the vicinity of the saturation field are mapped to a hard-hexagon model on a triangular lattice. The latter model is exactly...
Magnetocaloric effect in one-dimensional antiferromagnets (2004)
Zhitomirsky, M. E., Honecker, A.
An external magnetic field induces large relative changes in the entropy of one-dimensional quantum spin systems at finite temperatures. This leads to a magnetocaloric effect, i.e. a change in...
Magnetocaloric effect in pyrochlore antiferromagnet Gd2Ti2O7 (2004)
Sosin, S. S., Prozorova, L. A., Smirnov, A. I., Golov, A. I., Berkutov, I. B., Petrenko, O. A., ...
An adiabatic demagnetization process is studied in Gd2Ti2O7, a geometrically frustrated antiferromagnet on a pyrochlore lattice. In contrast to conventional paramagnetic salts, this compound can...
Exact low-temperature behavior of kagome antiferromagnet at high fields (2004)
Zhitomirsky, M. E., Tsunetsugu, Hirokazu
Low-energy degrees of freedom of a spin-1/2 kagome antiferromagnet in the vicinity of the saturation field are mapped to a hard-hexagon model on a triangular lattice. The latter model is exactly...
Magnetocaloric effect in one-dimensional antiferromagnets (2004)
Zhitomirsky, M. E., Honecker, A.
An external magnetic field induces large relative changes in the entropy of one-dimensional quantum spin systems at finite temperatures. This leads to a magnetocaloric effect, i.e. a change in...
Exact low-temperature behavior of kagome antiferromagnet at high fields (2004)
Zhitomirsky, M. E., Tsunetsugu, Hirokazu
Low-energy degrees of freedom of a spin-1/2 kagome antiferromagnet in the vicinity of the saturation field are mapped to a hard-hexagon model on a triangular lattice. The latter model is exactly...
Magnetocaloric effect in one-dimensional antiferromagnets (2004)
Zhitomirsky, M. E., Honecker, A.
An external magnetic field induces large relative changes in the entropy of one-dimensional quantum spin systems at finite temperatures. This leads to a magnetocaloric effect, i.e. a change in...
Pressure dependence of magnetism in URu2Si2 (2003)
Bourdarot, F., Fak, B., Mineev, V. P., Zhitomirsky, M. E., Kernavanois, N., Raymond, S., ...
Neutron-scattering and specific-heat measurements of the heavy-fermion superconductor URu2Si2 under hydrostatic pressure and with Rh-doping [U(Ru{0.98}Rh{0.02})2Si2] show the existence of two...
Jackeli, G., Zhitomirsky, M. E.
Quantum phase transition at the saturation field is studied for a class of frustrated quantum antiferromagnets. The considered models include (i) the $J_1$-$J_2$ frustrated square-lattice...
XY checkerboard antiferromagnet in external field (2003)
Canals, B., Zhitomirsky, M. E.
Ordering by thermal fluctuations is studied for the classical XY antiferromagnet on a checkerboard lattice in zero and finite magnetic fields by means of analytical and Monte Carlo methods. The model...
Ginzburg-Landau theory of vortices in a multi-gap superconductor (2003)
The Ginzburg-Landau functional for a two-gap superconductor is derived within the weak-coupling BCS model. The two-gap Ginzburg-Landau theory is, then, applied to investigate various magnetic...
Zaliznyak, I. A., Zhitomirsky, M. E.
Classical ground state of the isotropic Heisenberg spin Hamiltonian on a primitive Bravais lattice is known to be a single-Q planar spin spiral. A uniaxial anisotropy and external magnetic field...
Ginzburg-Landau theory of vortices in a multi-gap superconductor (2003)
The Ginzburg-Landau functional for a two-gap superconductor is derived within the weak-coupling BCS model. The two-gap Ginzburg-Landau theory is, then, applied to investigate various magnetic...
Ginzburg-Landau theory of vortices in a multi-gap superconductor (2003)
The Ginzburg-Landau functional for a two-gap superconductor is derived within the weak-coupling BCS model. The two-gap Ginzburg-Landau theory is, then, applied to investigate various magnetic...
Enhanced magnetocaloric effect in frustrated magnets (2002)
The magnetothermodynamics of strongly frustrated classical Heisenberg antiferromagnets on kagome, garnet, and pyrochlore lattices is examined. The field induced adiabatic temperature change (dT/dH)_S...
Enhanced magnetocaloric effect in frustrated magnets (2002)
The magnetothermodynamics of strongly frustrated classical Heisenberg antiferromagnets on kagome, garnet, and pyrochlore lattices is examined. The field induced adiabatic temperature change (dT/dH)_S...
Field induced transitions in a kagome antiferromagnet (2002)
The thermal order by disorder effect in magnetic field is studied for a classical Heisenberg antiferromagnet on the kagome lattice. Using analytical arguments we predict a unique H-T phase diagram...
Enhanced magnetocaloric effect in frustrated magnets (2002)
The magnetothermodynamics of strongly frustrated classical Heisenberg antiferromagnets on kagome, garnet, and pyrochlore lattices is examined. The field induced adiabatic temperature change (dT/dH)_S...
Field induced transitions in a kagome antiferromagnet (2002)
The thermal order by disorder effect in magnetic field is studied for a classical Heisenberg antiferromagnet on the kagome lattice. Using analytical arguments we predict a unique H-T phase diagram...
Field-Induced Order and Magnetization Plateaux in Frustrated Antiferromagnets (2001)
Honecker, A., Petrenko, O. A., Zhitomirsky, M. E.
We argue that collinearly ordered states which exist in strongly frustrated spin systems for special rational values of the magnetization are stabilized by thermal as well as quantum fluctuations....
Field induced transitions in a kagome antiferromagnet (2001)
The thermal order by disorder effect in magnetic field is studied for a classical Heisenberg antiferromagnet on the kagome lattice. Using analytical arguments we predict a unique H-T phase diagram...
Interband proximity effect and nodes of superconducting gap in Sr2RuO4 (2001)
Zhitomirsky, M. E., Rice, T. M.
The power-law temperature dependences of the specific heat, the nuclear relaxation rate, and the thermal conductivity suggest the presence of line nodes in the superconducting gap of Sr2RuO4. These...
Interband proximity effect and nodes of superconducting gap in Sr2RuO4 (2001)
Zhitomirsky, M. E., Rice, T. M.
The power-law temperature dependences of the specific heat, the nuclear relaxation rate, and the thermal conductivity suggest the presence of line nodes in the superconducting gap of Sr2RuO4. These...
Interband proximity effect and nodes of superconducting gap in Sr2RuO4 (2001)
Zhitomirsky, M. E., Rice, T. M.
The power-law temperature dependences of the specific heat, the nuclear relaxation rate, and the thermal conductivity suggest the presence of line nodes in the superconducting gap of Sr2RuO4. These...
Multiexciton molecules in the hexaborides (2000)
Gloor, T. A., Zhitomirsky, M. E., Rice, T. M.
We investigate multiexciton bound states in a semiconducting phase of divalent hexaborides. Due to three degenerate valleys in both the conduction and valence bands the binding energy of a 6-exciton...
Comment on "Electronic fine structure in the electron-hole plasma of SrB6" (2000)
Zhitomirsky, M. E., Rice, T. M., Anisimov, V. I.
In this comment we point out several misleading conclusions reached by Rodriguez et al. [PRL 84, 3903 (2000) and cond-mat/0003201] about the details of the band structure in SrB_6 and their role in...
Field induced ordering in highly frustrated antiferromagnets (2000)
Zhitomirsky, M. E., Honecker, A., Petrenko, O. A.
We predict that an external field can induce a spin order in highly frustrated classical Heisenberg magnets. We find analytically stabilization of collinear states by thermal fluctuations at a...
Electron-hole liquid in the hexaborides (1999)
Zhitomirsky, M. E., Rice, T. M.
We investigate the energetics of the electron-hole liquid in stoichiometric divalent metal hexaborides. The ground state energy of an electron-hole plasma is calculated using RPA and Hubbard schemes...
Excitonic ferromagnetism in the hexaborides (1999)
Zhitomirsky, M. E., Rice, T. M., Anisimov, V. I.
A ferromagnet with a small spontaneous moment but with a high Curie temperature can be obtained by doping an excitonic insulator made from a spin triplet exciton condensate. Such a condensate can...
Phenomenology of the superconducting state in Sr2RuO4 (1999)
Sigrist, M., Agterberg, D., Furusaki, A., Honerkamp, C., Ng, K. K., Rice, T. M., ...
The symmetry of the superconducting phase of Sr2RuO4 is identified as the odd-parity pairing state d(k)=\hat{z}(k_x \pm i k_y) based on recent experiments. The experimental evidence for the so-called...
Instability of antiferromagnetic magnons in strong fields (1998)
Zhitomirsky, M. E., Chernyshev, A. L.
We predict that spin-waves in an ordered quantum antiferromagnet (AFM) in a strong magnetic field become unstable with respect to spontaneous two-magnon decays. At zero temperature, the instability...
Zhitomirsky, M. E., Walker, M. B.
We calculate correction to the critical temperature of a dirty superconductor, which results from the local variations of the gap function near impurity sites. This correction is of the order of...
Thermal conductivity across a twin boundary in d-wave superconductor (1997)
Zhitomirsky, M. E., Walker, M. B.
We consider excitation spectrum near a twin boundary in an orthorhombic $d+s$ superconductor. The low-energy spectrum is highly sensitive to the presence of the small amount of s-wave component....
Electronic states on a twin boundary of a d-wave superconductor (1997)
Zhitomirsky, M. E., Walker, M. B.
We show that an induced $s$-wave harmonic in the superconducting gap of an orthorhombic $d_{x^2-y^2}$ superconductor strongly affects the excitation spectrum near a twinning plane. In particular, it...
Nearly critical ground state of LaCuO2.5 (1996)
Troyer, Matthias, Zhitomirsky, M. E., Ueda, Kazuo
Using a combination of analytical techniques and Quantum Monte Carlo simulations we investigate the coupled spin ladder system LaCuO2.5. At a critical ratio of the interladder to intraladder coupling...
Effect of Quantum Fluctuations on Magnetic Ordering in CaV$_3$O$_7$ (1996)
Kontani, Hiroshi, Zhitomirsky, M. E., Ueda, Kazuo
We present a theoretical model for CaV$_3$O$_7$: the $1/4$-depleted square spin-$1/2$ Heisenberg model which includes both the nearest-neighbor coupling ($J$) and the next-nearest-neighbor coupling...
New valence bond crystal phase of a frustrated spin-1/2 square lattice antiferromagnet (1996)
Zhitomirsky, M. E., Ueda, Kazuo
We propose a new type of magnetically disordered ground state for a frustrated quantum antiferromagnet. This disordered state is an array of spin singlets spontaneously formed on four spin...
Origin of spin-gap in CaV$_4$O$_9$: effect of frustration and lattice distortion (1996)
Starykh, O. A., Zhitomirsky, M. E., Khomskii, D. I., Singh, R. R. P., Ueda, K.
We study the origin of spin-gap in recently discovered material CaV$_4$O$_9$. We analyze the spin-$1/2$ Heisenberg model on the $1/5$ depleted square lattice with nearest neighbor (nn) and next...
Static properties of a quasi one-dimensional antiferromagnet in magnetic field (1995)
Zhitomirsky, M. E., Zaliznyak, I. A.
We calculate the effect of zero-point fluctuations on the magnetostatic properties of a quasi one-dimensional antiferromagnetic helimagnet with and without in-plane anisotropy. We find substantial...
MAGNETIC PROPERTIES OF UNCONVENTIONAL SUPERCONDUCTORS (1995)
Luk'yanchuk, I. A., Zhitomirsky, M. E.
The article reviews recent developments on magnetic properties of superconductors with anisotropic Cooper pairing. In particular, we show how the concept of broken symmetries is applied to the...