Study of diffuse scattering under hydrostatic pressure in PbMg1/3Nb2/3O3 (2009)
Padmanabhan, B, Gvasaliya, S N, Roessli, B, Strassle, Th, Cowley, R A, ...
We report measurements of the evolution of the diffuse scattering in a single crystal PbMg1/3Nb2/3O3 as a function of hydrostatic pressure. Upon applying pressure the diffuse scattering intensity...
Excitations from a chiral magnetized state of a frustrated quantum spin liquid (2009)
Zheludev, A., Garlea, V. O., Tsvelik, A., Habicht, K., Kiefer, K., ...
We study excitations in weakly interacting pairs of quantum spin ladders coupled through geometrically frustrated bonds. The ground state is a disordered spin liquid, that at high fields is replaced...
Diffuse scattering from the lead-based relaxor ferroelectric PbMg_1/3Ta_2/3O_3 (2009)
Cervellino, A., Gvasaliya, S. N., Zaharko, O., Roessli, B., Rotaru, G. M., Cowley, R. A., ...
The relaxor ferroelectric PbMg_1/3Ta_2/3O_3 was studied by single-crystal neutron and synchrotron x-ray diffraction and its detailed atomic structure has been modeled in terms of static...
Helimagnon Bands as Universal Spin Excitations (2009)
Janoschek, M., Bernlochner, F., Dunsiger, S., Pfleiderer, C., Böni, P., Roessli, B., ...
Nearly 80 years of research have established the universal nature of the low-energy spin wave dispersion of ferromagnets and commensurate antiferromagnets as a cornerstone of our understanding of...
Hong, Tao, Custelcean, R., Sales, B. C., Roessli, B., Singh, D. K., Zheludev, A.
A novel organometallic compound 2Dioxane.CuCl2.2H2O has been synthesized and structurally characterized by X-ray crystallography. Magnetic susceptibility and zero-field inelastic neutron scattering...
Coexistence of incommensurate magnetism and superconductivity in Fe_{1+y}Se_xTe_{1-x} (2009)
Khasanov, R., Bendele, M., Amato, A., Babkevich, P., Boothroyd, A. T., Cervellino, A., ...
We report an investigation into the superconducting and magnetic properties of Fe_{1+y}Se_{x}Te_{1-x} single crystals by magnetic susceptibility, muon spin rotation, and neutron diffraction. We find...
Spin-glass state and long-range magnetic order in Pb(Fe1/2Nb1/2)O3 (2009)
Roessli, B., Amato, A., Gvasaliya, S. N., Lushnikov, S. G., Shaplygina, T. A.
We have investigated the magnetic ground-state of the multiferroic relaxor ferroelectric Pb(Fe$_{1/2}$Nb$_{1/2}$)O$_{3}$ with $\mu$SR spectroscopy and neutron scattering. We find that a transition to...
Noncentrosymmetric Commensurate Magnetic Ordering of Multiferroic ErMn2O5 (2008)
Roessli, B., Fischer, P., Brown, P. J., Janoschek, M., Sheptyakov, D., Gvasaliya, S. N., ...
The non-centrosymmetric magnetic structure of ErMn$_2$O$_5$ has been shown to be very similar to that of HoMn$_2$O$_5$ (Vecchini {\it et al.}, 2008 Phys. Rev. B {\bf 77} 134434). The magnetic...
Soft Modes and Relaxor Ferroelectrics (2008)
Cowley, R. A., Gvasaliya, S. N., Roessli, B.
Relaxor ferroelectrics are difficult to study and understand. The experiment shows that at low energy scattering there is an acoustic mode, an optic mode, dynamic quasi-elastic scattering and...
Gvasaliya, S. N., Roessli, B., Kojima, S., Lushnikov, S. G., ...
We show that the neutron diffuse scattering in relaxor ferroelectric (1-x)PbZn$_{1/3}$Nb$_{2/3}$O$_{3}$ - x PbTiO$_{3}$ (x=0.07) consists of two components. The first component is strictly elastic...
Magnetic and orbital ordering in the spinel MnV2O4 (2007)
Garlea, V. O., Jin, R., Mandrus, D., Roessli, B., Huang, Q., Miller, M., ...
Neutron inelastic scattering and diffraction techniques have been used to study the MnV2O4 spinel system. Our measurements show the existence of two transitions to long-range ordered ferrimagnetic...
Anisotropy and the critical behaviour of the quasi-2D antiferromagnet, MnPS3 (2007)
Wildes, A. R., Ronnow, H. M., Roessli, B., Harris, Mt, Godfrey, K. W.
Neutron scattering has been used to measure the critical behaviour of the sublattice magnetization, M, and the gap in the spin wave energies at the Brillouin zone centre, E-0, for a single crystal of...
Lancaster, T., Blundell, S. J., Andreica, D., Janoschek, M., Roessli, B., Gvasaliya, S. N., ...
The rare-earth ferroelectromagnet YMnO3 consists of weakly coupled triangular layers of S=2 spins. Below T_N ~ 70 K muon-spin relaxation data show two oscillatory relaxing signals due to magnetic...
Simultaneous Antiferromagnetic Fe3+ and Nd3+ Ordering in NdFe3(11BO3)4 (2006)
Fischer, P., Pomjakushin, V., Sheptyakov, D., Keller, L., Janoschek, M., Roessli, B., ...
By means of magnetic susceptibility and specific heat measurements, x-ray and unpolarised neutron diffraction investigations on powder and single-crystal samples, simultaneous long-range...
The Structural Phase Transition of the Relaxor Ferroelectric 68%PbMg1/3Nb2/3O3-32%PbTiO3 (2006)
Gvasaliya, S. N., Roessli, B., Cowley, R. A., Kojima, S., Lushnikov, S. G.
Neutron scattering techniques have been used to study the relaxor ferroelectric 0.68PbMg1/3Nb2/3O3-0.32PbTiO3 denoted in this paper as 0.68PMN-0.32PT. On cooling, these relaxor ferroelectrics have a...
Pressure Induced Changes in the Antiferromagnetic Superconductor YbPd2Sn (2006)
Cumberlidge, A-M., Alireza, P. L., Kusmartseva, A. F., Pearson, E. E., Lonzarich, G. G., Bernhoeft, N. R., ...
Low temperature ac magnetic susceptibility measurements of the coexistent antiferromagnetic superconductor YbPd2Sn have been made in hydrostatic pressures < 74 kbar in moissanite anvil cells. The...
Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7 (2006)
De Reotier, P. Dalmas, Yaouanc, A., Keller, L., Cervellino, A., Roessli, B., Baines, C., ...
We report a study of the geometrically frustrated magnetic material Tb2Sn2O7 by the positive muon spin relaxation technique. No signature of a static magnetically ordered state is detected while...
Gvasaliya, S. N., Pomjakushin, V., Roessli, B., Straessle, Th., Klotz, S., Lushnikov, S. G.
The crystal structure of the PbMg$_{1/3}$Ta$_{2/3}$O$_3$ (PMT) relaxor ferroelectric was studied under hydrostatic pressure up to $\sim 7$ GPa by means of powder neutron diffraction. We find a...
Spin dynamics and magnetic order in magnetically frustrated Tb$_2$Sn$_2$O$_7$ (2006)
Réotier, P Dalmas De, Yaouanc, A, Keller, L, Cervellino, A, Roessli, B, Baines, C, ...
Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7 (2006)
Yaouanc, A., Keller, L., Cervellino, A., Roessli, B., Baines, C., ...
Static and dynamic critical properties of the quasi-two-dimensional antiferromagnet MnPS3 (2006)
Wildes, A. R., Ronnow, H. M., Roessli, B., Harris, M. J., Godfrey, K. W.
A comprehensive study of the static and dynamic critical properties of the quasi-two-dimensional antiferromagnet MnPS3 is presented. The relatively large spin S=5/2 of the Mn ions ensure...
Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7 (2006)
De Reotier, PD, Yaouanc, A, Keller, L, Cervellino, A, Roessli, B, Baines, C, ...
Vecchini, C., Moze, O., Hoser, A., Prager, M., Argyriou, D., Michels, A., ...
Journal of Applied Physics, 99(2006) S.08F502/1-3
Reduction of the ordered magnetic moment in YMnO3 with hydrostatic pressure (2005)
Janoschek, M., Roessli, B., Keller, L., Gvasaliya, S. N., Conder, K., Pomjakushina, E.
YMnO3 exhibits a ferroelectric transition at high temperature (~ 900 K) and magnetic ordering at T_N ~ 70 K where the dielectric constant shows an anomaly indicative of the magneto-dielectric effect....
Quasi-Elastic Scattering, Random Fields and phonon-coupling effects in PbMg1/3Nb2/3O3 (2005)
Gvasaliya, S N, Roessli, B, Cowley, R A, Hubert, P, Lushnikov, S G
The low-energy part of the vibration spectrum in PbMg$_{1/3}$Nb$_{2/3}$O$_3$ (PMN) relaxor ferroelectric has been studied by neutron scattering above and below the Burns temperature, T$_d$. The...
Spin fluctuations in the stacked-triangular antiferromagnet YMnO3 (2005)
Roessli, B., Gvasaliya, S. N., Pomjakushina, E., Conder, K.
The spectrum of spin fluctuations in the stacked-triangular antiferromagnet YMnO3 was studied above the Neel temperature using both unpolarized and polarized inelastic neutron scattering. We find an...
Vecchini, C., Moze, O., Hoser, A., Prager, M., Argyriou, D., Michels, A., ...
50th Conf.on Magnetism and Magnetic Materials, San Jose Calif., October 30 - November 3, 2005
Spin waves and magnetic interactions in LiCu2O2 (2004)
Masuda, T., Zheludev, A., Roessli, B., Bush, A., Vasiliev, M. Markina A.
The quasi-one-dimensional helimagnet LiCu2O2 was studied by single crystal inelastic neutron scattering. The dispersion relation of spin wave excitations was measured in the vicinity of the principal...
Hiess, A., Bernhoeft, N., Metoki, N., Lander, G. H., Roessli, B., Sato, N. K., ...
This paper, I, presents new results from neutron inelastic scattering experiments on single crystals of UPd2Al3. The focus is on the experimental position whilst the sequel, II, advances theoretical...
Bernhoeft, N., Hiess, A., Metoki, N., Lander, G. H., Roessli, B.
This paper provides an analysis of neutron inelastic scattering experiments on single crystals of UPd2Al3. The emphasis is on establishing robust, general, inferences on the joint...
Dynamics of cubic-tetragonal phase transition in KNbO$_3$ perovskite (2004)
Gvasaliya, S. N., Roessli, B., Cowley, R. A., Lushnikov, S. G., Choubey, A., Gunter, P.
The low-energy part of the vibration spectrum in KNbO$_3$ was studied by cold neutron inelastic scattering in the cubic phase. In addition to acoustic phonons, we observe strong diffuse scattering,...
Gvasaliya, S. N., Roessli, B., Sheptyakov, D., Lushnikov, S. G., Shaplygina, T. A.
Neutron scattering investigations were carried out in PbMg$_{1/3}$Ta$_{2/3}$O$_3$ and BaMg$_{1/3}$Ta$_{2/3}$O$_3$ complex perovskites. The crystal structure of both compounds does not show any phase...
Gvasaliya, S. N., Lushnikov, S. G., Roessli, B.
The low-energy part of vibration spectrum in PbMg$_{1/3}$Nb$_{2/3}$O$_3$ relaxor ferroelectric was studied by inelastic neutron scattering. We observed the coexistence of a resolution-limited central...
Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7 (2003)
Zheludev, A., Sato, T., Masuda, T., Uchinokura, K., Shirane, G., Roessli, B.
The square-lattice antiferromagnet Ba2CoGe2O7 is studied by means of neutron diffraction and inelastic scattering. This material is isostructural to the well-known Dzyaloshinskii-Moriya helimagnet...
Roessli, B., Böni, P., Fischer, W. E., Endoh, Y.
Using polarized inelastic neutron scattering the antisymmetric part of the dynamical susceptibility in non-centrosymmetric MnSi is determined. The paramagnetic fluctuations are found to be...
Magnetic fluctuations and superconductivity in YbPd$_2$Sn (2002)
Amato, A., Roessli, B., Fischer, P., Bernhoeft, N., Stunault, A., Baines, C., ...
We report muon spin relaxation and inelastic neutron measurements on the Heusler system YbPd$_2$Sn. Localised anisotropic and quasi-elastic Yb magnetic fluctuations are observed below $T = 150$K....
Spin-wave spectrum of copper metaborate in the commensurate phase 10K (2002)
Boehm, M., Martynov, S., Roessli, B., Petrakovskii, G., Kulda, J.
We have investigated the spin-wave spectrum of copper metaborate, CuB$_2$O$_4$, by means of inelastic neutron scattering in the commensurate magnetic phase. We have found two branches of spin-wave...
Chiral fluctuations in MnSi above Tc (2002)
Roessli, B., Boeni, P., Fischer, W. E., Endoh, Y.
Polarized neutrons are used to determine the antisymmetric part of the magnetic susceptibility in non-centrosymmetric MnSi. The paramagnetic fluctuations are found to be incommensurate with the...
Boeni, P., Roessli, B., Goerlitz, D., Koetzler, J.
By inelastic scattering of polarized neutrons near the (200)-Bragg reflection, the susceptibilities and linewidths of the spin waves and the longitudinal spin fluctuations were determined separately....
Formation of a Magnetic Soliton Lattice in Copper Metaborate (2001)
Bezmaternikh, L., Boehm, M., Ouladdiaf, B., Petrakovskii, G. A., Roessli, B., Schefer, J., ...
Polarized Neutron Scattering (2000)
The technique of polarized neutron scattering is reviewed with emphasis on applications. Many examples of the usefulness of the method in various fields of physics are given like the determination of...
Spin Excitations in Localized and Itinerant Magnets (2000)
Collective excitations in magnetic materials can be investigated by means of inelastic neutron scattering. We show that this experimental method gives access to the complete spectrum of magnetic...
Spin-Glass State in $\rm CuGa_2O_4$ (2000)
Petrakovskii, G. A., Aleksandrov, K. S., Bezmaternikh, L. N., Aplesnin, S. S., Roessli, B., Semadeni, F., ...
Magnetic susceptibility, magnetization, specific heat and positive muon spin relaxation (\musr) measurements have been used to characterize the magnetic ground-state of the spinel compound $\rm...
Magnetic Phase Transitions in the double spin-chains compound $\rm LiCu_2O_2$ (2000)
Roessli, B., Staub, U., Amato, A., Herlach, D., Pattison, P., Sablina, K., ...
We report high-resolution x-ray diffraction, muon-spin-rotation spectroscopic and specific heat measurements in the double spin-chains compound $\rm LiCu_2O_2$. The x-ray diffraction results show...
Macroscopic and Local Magnetic Moments in Si-doped CuGeO$_3$ with Neutron and $\mu$SR Studies (2000)
Semadeni, F., Amato, A., Roessli, B., Böni, P., Baines, C., Masuda, T., ...
The temperature-concentration phase diagram of the Si-doped spin-Peierls compound CuGeO$_{3}$ is investigated by means of neutron scattering and muon spin rotation spectroscopy in order to determine...
Formation of a magnetic soliton lattice in copper metaborate (2000)
Roessli, B., Schefer, J., Petrakovskii, G., Ouladdiaf, B., Boehm, M., Staub, U., ...
The magnetic ground-state of copper metaborate is investigated by means of elastic neutron scattering.The magnetic structure of CuB2O4 is incommensurate with respect to the chemical lattice at T=1.8K...
Critical scattering of RbMnF3 revisited (1998)
Coldea, R, Cowley, R A, Perring, T G, McMorrow, D F, Roessli, B
Critical behaviour of the three-dimensional Heisenberg antiferromagnet RbMnF3 (1998)
Coldea, R, Cowley, R A, Perring, T G, McMorrow, D F, Roessli, B
Collective ionic dynamics in a molten binary alloy (1998)
Fernandez-Perea, R., Alvarez, M., Bermejo, F.J., Verkerk,P., Roessli, B., Enciso, E.