Nazaretski, E., Thibodaux, J. P., Vekhter, I., Civale, L., Thompson, J. D., Movshovich, R.
We report the local measurements of the magnetic penetration depth $\lambda$ in a superconducting Nb film using magnetic force microscopy (MFM). We developed a method for quantitative extraction of...
Mishra, V., Vorontsov, A., Hirschfeld, P. J., Vekhter, I.
Within a two-band model for the recently discovered ferropnictide materials, we calculate the thermal conductivity assuming general superconducting states of $A_{1g}$ ("s-wave") symmetry, considering...
Boyd, G. R., Hirschfeld, P. J., Vekhter, I., Vorontsov, A. B.
Experiments on several novel superconducting compounds have observed oscillations of the specific heat when an applied magnetic field is rotated with respect to the crystal axes. The results are...
Pauli-limited upper critical field in dirty d-wave superconductors (2008)
Vorontsov, A. B., Vekhter, I., Graf, M. J.
We calculate the Pauli-limited upper critical field and the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) instability for {\it dirty} d-wave superconductors within the quasiclassical theory using the...
Surface bound states and spin currents in non-centrosymmetric superconductors (2008)
Vorontsov, A. B., Vekhter, I., Eschrig, M.
We investigate the influence of spin-orbit coupling in a non-centrosymmetric superconductor on its ground state properties near a surface. We determine the spectrum of Andreev bound states due to...
Searching for zeroes: unconventional superconductors in a magnetic field (2008)
We review the results of the microscopic approach to the calculation of the anisotropy in the specific heat in unconventional superconductors under rotated field. Treating vortex scattering on equal...
Kasahara, Y., Iwasawa, T., Shimizu, Y., Shishido, H., Shibauchi, T., Vekhter, I., ...
Quasi-two dimensional CeIrIn5 contains two distinct domes with different heavy fermion superconducting states in its phase diagram. Here we pinned down the superconducting gap structure of CeIrIn5 in...
I. Vekhter, P. J. Hirschfeld, J. P. Carbotte, E. J. Nicol
The density of states of a 2D d-wave superconductor in the vortex state with applied magnetic field H in the plane is shown to exhibit fourfold oscillations as a function of the angle of the field...
I. Vekhter, J. P. Carbotte, P. J. Hirschfeld, E. J. Nicol
Quasiparticle properties of d-wave superconductors in the vortex state
Fermi Surface Geometry and the Ultrasonic Attenuation of a Clean d-wave Superconductor (2007)
Abstract. The longitudinal ultrasonic attenuation coecient for a clean d-wave superconductor has been calculated for the case of a d x 2 y 2 order parameter and a simple two-dimensional tight-binding...
We develop a fully microscopic theory for the calculations of the angle-dependent properties of unconventional superconductors under a rotated magnetic field. We employ the quasiclassical Eilenberger...
Unconventional superconductors under rotating magnetic field II: thermal transport (2007)
We present a microscopic approach to the calculations of thermal conductivity in unconventional superconductors for a wide range of temperatures and magnetic fields. Our work employs the...
Interplane and intraplane heat transport in quasi two-dimensional nodal superconductors (2006)
We analyze the behavior of the thermal conductivity in quasi-two dimensional superconductors with line nodes. Motivated by measurements of the anisotropy between the interplane and intraplane thermal...
Matsuda, Y., Izawa, K., Vekhter, I.
Over the past two decades, unconventional superconductivity with gap symmetry other than s-wave has been found in several classes of materials, including heavy fermion (HF), high-T_c, and organic...
Superconducting gap nodes in PrOs_4Sb_12 (2006)
Curnoe, S. H., Alrub, T. R. Abu, Sergienko, I. A., Vekhter, I.
We examine the superconducting gap nodes in crystals with tetrahedral (T_h) symmetry. The (0,0,1) phase of the three dimensional order parameter in the triplet channel has nodes in the [001]...
Anisotropy of heat capacity in Pauli limited unconventional superconductors (2006)
Diamagnetically coupled magnetic field can be used as a probe of nodal positions in unconventional superconductors. The heat capacity depends on the angle $\phi_0$ between the magnetic field and the...
Nodal structure of quasi-2D superconductors probed by magnetic field (2006)
We consider a quasi two-dimensional superconductor with line nodes in an in-plane magnetic field, and compute the dependence of the specific heat, $C$, and the in-plane heat conductivity, $\kappa$,...
Impurity-induced states in conventional and unconventional superconductors (2004)
Balatsky, A. V., Vekhter, I., Zhu, Jian-Xin
We review recent developments in our understanding of how impurities influence the electronic states in the bulk of superconductors. Our focus is on the quasi-localized states in the vicinity of...
Non-fermi liquid behavior in itinerant antiferromagnets (2004)
We consider a two dimensional itinerant antiferromagnet near a quantum critical point. We show that, contrary to conventional wisdom, fermionic excitations in the ordered state are not the usual...
Park, Tuson, Chia, Elbert E. M., Salamon, M. B., Bauer, E. D., Vekhter, I., Thompson, J. D., ...
A study of the dependence of the heat capacity Cp(alpha) on field angle in LuNi2B2C reveals an anomalous disorder effect. For pure samples, Cp(alpha) exhibits a fourfold variation as the field H <...
Avoided Antiferromagnetic Order and Quantum Critical Point in CeCoIn$_5$ (2003)
Bianchi, A., Movshovich, R., Vekhter, I., Pagliuso, P. G., Sarrao, J. L.
We measured specific heat and resistivity of heavy fermion CeCoIn5 between the superconducting critical field $H_{c2} = 5 T$ and 9 T, with field in the [001] direction, and at temperatures down to...
A proposal to determine the spectrum of pairing-glue in high-temperature superconductors (2002)
We propose a method for an analysis of the angle-resolved photoemission data in two-dimensional anisotropic superconductors which directly yields the spectral function of the bosons mediating Cooper...
Tail states in superconductors with weak magnetic impurities (2002)
Vekhter, I., Shytov, A. V., Gruzberg, I. A., Balatsky, A. V.
We analyse the behavior of the density of states in a singlet s-wave superconductor with weak magnetic impurities in the clean limit by using the method of optimal fluctuation. We show that the...
Tail states in clean superconductors with magnetic impurities (2002)
Shytov, A. V., Vekhter, I., Gruzberg, I. A., Balatsky, A. V.
We analyse the behavior of the density of states in a singlet s-wave superconductor with weak magnetic impurities in the clean limit. By using the method of optimal fluctuation and treating the order...
Thermodynamics of d-wave superconductors in a magnetic field (2000)
Vekhter, I., Hirschfeld, P. J., Nicol, E. J.
We investigate the thermodynamic properties of a two-dimensional d-wave superconductor in the vortex state using a semiclassical approach, and argue that such an approach is valid for the analysis of...
Angle-dependent magnetothermal conductivity in d-wave superconductors (1999)
Vekhter, I., Hirschfeld, P. J.
We analyse the behavior of the thermal conductivity, $\kappa(H)$, in the vortex state of a quasi-two-dimensional d-wave superconductor when both the heat current and the applied magnetic field are in...
Thermal conductivity in the vortex state of d-wave superconductors (1999)
We present the results of a microscopic calculation of the longitudinal thermal conductivity of quasiparticles, $\kappa_{xx}$, in a 2D d-wave superconductor in the vortex state. Our approach takes...
Interlayer Quasiparticle Transport in the Vortex State of Josephson Coupled Superconductors (1999)
Vekhter, I., Bulaevskii, L. N., Koshelev, A. E., Maley, M. P.
We calculate the dependence of the interlayer quasiparticle conductivity, $\sigma_q$, in a Josephson coupled d-wave superconductor on the magnetic field B||c and the temperature T. We consider a...
Quasiparticle thermal conductivity in the vortex state of high-T$_c$ cuprates (1999)
We present the results of a microscopic calculation of the longitudinal thermal conductivity, $\kappa$, of a d-wave superconductor in the mixed state. Our results show an increase in the thermal...
Vekhter, I., Hirschfeld, P. J., Carbotte, J. P., Nicol, E. J.
The density of states of a 2D d-wave superconductor in the vortex state with applied magnetic field $\bf H$ in the plane is shown to exhibit fourfold oscillations as a function of the angle of the...
Anisotropic thermodynamics of d-wave superconductors in the vortex state (1998)
Vekhter, I., Hirschfeld, P. J., Carbotte, J. P., Nicol, E. J.
We show that the density of states and the thermodynamic properties of a 2D d-wave superconductor in the vortex state with applied magnetic field $\bf H$ in the plane depend on the angle between $\bf...
Ultrasonic attenuation in clean d-wave superconductors (1998)
Vekhter, I., Nicol, E. J., Carbotte, J. P.
We consider the attenuation of longitudinal ultrasonic waves in a clean two-dimensional d-wave superconductor. We show that the attenuation coefficient is linear in temperature at low temperatures...
Quasiparticle transport in the vortex state of d-wave superconductors (1998)
Vekhter, I., Carbotte, J. P., Nicol, E. J.
We calculate the magnetic field and temperature dependence of the Raman response, superfluid density and the NMR relaxation rate in the vortex state of a d-wave superconductor arising from the...
Quasiclassical Approach to Transport in the Vortex State and the Hall Effect (1997)
We derive generalized quasiclassical transport equations which include the terms responsible for the Hall Effect in the vortex state of a clean type-II superconductor, and calculate the conductivity...
Hall Effect in the mixed state of moderately clean superconductors (1996)
The Hall conductivity in the mixed state of a clean ($l \gg \xi_0$) type-II s-wave superconductor is determined from a microscopic calculation within a quasiclassical approximation. We find that...