Field induced magnetic order in the frustrated magnet Gadolinium Gallium Garnet (2008)
Petrenko, O. A., Balakrishnan, G., Paul, D. McK, Yethiraj, M., McIntyre, G. J., Wills, A. S.
Gd3Ga5O12, (GGG), has an extraordinary magnetic phase diagram, where no long range order is found down to 25 mK despite \Theta_CW \approx 2 K. However, long range order is induced by an applied field...
Low-temperature magnetic ordering in SrEr$_2$O$_4$ (2008)
Petrenko, O. A., Balakrishnan, G., Wilson, N. R., De Brion, S., Suard, E., Chapon, L. C.
SrEr$_2$O$_4$ has been characterised by low-temperature powder neutron diffraction, as well as single crystal specific heat and magnetisation measurements. Magnetisation measurements show that the...
The nature of the magnetic order in Ca3Co2O6 (2008)
Agrestini, S., Chapon, L. C., Daoud-Aladine, A., Schefer, J., Gukasov, A., Mazzoli, C., ...
We present a detailed powder and single crystal neutron diffraction study of the spin chain compound Ca3Co2O6. Below 25 K, the system orders magnetically with a modulated partially disordered...
Co-existing chiral and collinear phases in a distorted triangular antiferromagnet (2008)
Smirnov, A. I., Svistov, L. E., Prozorova, L. A., Zheludev, A., Lumsden, M. D., Ressouche, E., ...
The entire magnetic phase diagram of the quasi two dimensional (2D) magnet on a distorted triangular lattice KFe(MoO4)2 is outlined by means of magnetization, specific heat, and neutron diffraction...
Spin-liquid dynamics of pyrochlore magnets Gd2Ti2O7 and Gd2Sn2O7 (2007)
Sosin, S. S., Prozorova, L. A., Smirnov, A. I., Bonville, P., Bras, G. Jasmin - Le, Petrenko, O. A.
The spin-liquid phase of two highly frustrated pyrochlore magnets Gd2Ti2O7 and Gd2Sn2O7 is probed using electron spin resonance in the temperature range 1.3 - 30 K. The deviation of the absorption...
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...
Magnetic excitations in the Kagome staircase compounds (2006)
Wilson, N. R., Petrenko, O. A., Balakrishnan, G., Manuel, P., Fak, B.
Inelastic neutron scattering measurements have been performed on single crystal samples of Co3V2O8 and Ni3V2O8. The magnetic system in these compounds is believed to be frustrated, as the magnetic...
Magnetic phases in the Kagome staircase compound Co3V2O8 (2006)
Wilson, N. R., Petrenko, O. A., Chapon, L. C.
The low temperature properties of the Kagome-type system Co3V2O8 have been studied by powder neutron diffraction both in zero field and in applied magnetic field of up to 8 T. Below 6 K, the...
Magnetic phase diagrams of the Kagome staircase compounds Co3V2O8 and Ni3V2O8 (2006)
Wilson, N. R., Petrenko, O. A., Balakrishnan, G.
An extensive low temperature magnetisation study of high quality single crystals of the Kagome staircase compounds Ni3V2O8 and Co3V2O8 has been performed, and the H-T phase diagrams have been...
Svistov, L. E., Smirnov, A. I., Prozorova, L. A., Petrenko, O. A., Micheler, A., Buttgen, N., ...
We have studied the magnetic and thermodynamic properties as well as the NMR spectra of the Heisenberg antiferromagnet RbFe(MoO4)2. The observed temperature dependence of the order parameter, the...
Neutron scattering studies of the spin ices Ho2Ti2O7 and Dy2Ti2O7 in applied magnetic field (2005)
Fennell, T., Petrenko, O. A., Fak, B., Gardner, J. S., Bramwell, S. T., Ouladdiaf, B.
Neutron diffraction has been used to investigate the magnetic correlations in single crystals of the spin ice materials Ho2Ti2O7 and Dy2Ti2O7 in an external magnetic field applied along either the...
Neutron scattering studies of the spin ices Ho2Ti2O7 and Dy2Ti2O7 in applied magnetic field (2005)
Fennell, T, Petrenko, O A, Fak, B, Gardner, JS, Bramwell, S T, Ouladdiaf, B
Neutron diffraction has been used to investigate the magnetic correlations in single crystals of the spin ice materials Ho2Ti2O7 and Dy2Ti2O7 in an external magnetic field applied along either the...
Revised magnetic properties of CuFeO2 - a case of mistaken identity (2005)
Petrenko, O. A., Lees, M. R., Balakrishnan, G., De Brion, S., Chouteau, G.
Single crystals of the anisotropic Kagome staircase compounds Ni3V2O8 and Co3V2O8 (2004)
Balakrishnan, G., Petrenko, O. A., Lees, M. R., Paul, D. McK.
Compounds with a Kagome type lattice are known to exhibit magnetic frustration. Large single crystals of two compounds Ni3V2O8 and Co3V2O8, which are variants of a Kagome net lattice, have been grown...
Neutron Scattering Investigation of the Spin Ice State in Dy2Ti2O7 (2004)
Fennell, T., Petrenko, O. A., Fak, B., Bramwell, S. T., Enjalran, M., Yavors'kii, T., ...
Dy2Ti2O7 has been advanced as an ideal spin ice. We present a neutron scattering investigation of a sample of 162Dy2Ti2O7. The scattering intensity has been mapped in zero applied field in the hhl...
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...
Neutron scattering investigation of the spin ice state in Dy2Ti2O7 (2004)
Fennell, T, Petrenko, O A, Fak, B, Bramwell, S T, Enjalran, M, Yavors'kii, T, ...
Dy2Ti2O7 has been advanced as an ideal spin ice material. We present a neutron scattering investigation of a single-crystal sample of (Dy2Ti2O7)-Dy-162. The scattering intensity has been mapped in...
Magnetic phase diagram of the antiferromagnetic pyrochlore Gd2Ti2O7 (2003)
Petrenko, O. A., Lees, M. R., Balakrishnan, G., Paul, D. McK.
Gd2Ti2O7 is a highly frustrated antiferromagnet on a pyrochlore lattice, where apart from the Heisenberg exchange the spins also interact via dipole-dipole forces. We report on low-temperature...
Comment on "Short-range magnetic interactions in the spin-ice compound Ho2Ti2O7" (2002)
Petrenko, O. A., Lees, M. R., Balakrishnan, G.
In their recent communication (Phys. Rev. B 64, 060406(R) (2001)) Cornelius and Gardner have reported the results of magnetization and susceptibility studies on single crystals of the pyrochlore...
Quasi two-dimensional antiferromagnet on a triangular lattice RbFe(MoO4)2 (2002)
Svistov, L. E., Smirnov, A. I., Prozorova, L. A., Petrenko, O. A., Demianets, L. N., Shapiro, A. Ya.
RbFe(MoO4)2 is a rare example of a nearly two-dimensional Heisenberg antiferromagnet on a triangular lattice. Magnetic resonance spectra and magnetization curves reveal that the system has a layered...
Field-induced partial order in the spin ice dysprosium titanate (2002)
Fennell, T, Petrenko, O A, Balakrishnan, G, Bramwell, S T, Champion, J D M, Fak, B, ...
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 Partial Order in the Spin-Ice Dysprosium Titanate (2001)
Fennell, T., Petrenko, O. A., Balakrishnan, G., Bramwell, S. T., Champion, J. D. M., Fak, B., ...
Neutron scattering has been used to investigate the magnetic correlations in the the spin ice material dysprosium titanate, Dy2Ti2O7. An isotopically enriched sample was used to minimise neutron...
Classical Heisenberg antiferromagnet on a garnet lattice: a Monte Carlo simulation (2000)
We have studied a classical antiferromagnet on a garnet lattice by means of Monte Carlo simulations in an attempt to examine the role of geometrical frustration in Gadolinium Gallium Garnet,...
High Magnetic Field Behaviour of the Triangular Lattice Antiferromagnet, CuFeO_2 (2000)
Petrenko, O. A., Balakrishnan, G., Lees, M. R., Paul, D. McK, Hoser, A.
The high magnetic field behaviour of the triangular lattice antiferromagnet CuFeO_2 is studied using single crystal neutron diffraction measurements in a field of up to 14.5 T and also by...
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-spin-resonance in the doped spin-Peierls compound Cu(1-x)Ni(x)GeO3 (1998)
Glazkov, V. N., Smirnov, A. I., Petrenko, O. A., Paul, D. Mck., Vetkin, A. G., Eremina, R. M.
ESR-study of the Ni-doped spin-Peierls compound CuGeO3 has been performed in the frequency range 9-75 GHz. At low temperatures the g-factor is smaller than the value expected for Cu- and Ni-ions....
Triangular Antiferromagnets (1997)
Collins, M. F., Petrenko, O. A.
In this article we review the effects of magnetic frustation in the stacked triangular lattice. Frustration increases the degeneracy of the ground state, giving rise to different physics. In...
Enhancement of Anisotropy due to Fluctuations in Quasi-One-Dimensional Antiferromagnets (1994)
Abanov, A. G., Petrenko, O. A.
It is shown that the observed anisotropy of magnetization at high magnetic fields in RbMnBr3 , a quasi-one-dimensional antiferromagnet on a distorted stacked triangular lattice, is due to quantum and...