212 citations · 1.5k across the 41 of their papers we have counts for
17 papers · 1 filter
Origin and dynamics of umbrella states in rare-earth iron garnets
Bruno Tomasello, Dan Mannix, Stephan Geprägs +1
Rare-earth iron garnets FeO are fascinating insulators with very diverse magnetic phases. Their strong potential in spintronic devices has encouraged a renewal…
Ground state selection by magnon interactions in the fcc antiferromagnet
R. Schick, O. Götze, T. Ziman +3
We study the nearest-neighbor Heisenberg antiferromagnet on a face-centered cubic lattice with arbitrary spin S. The model exhibits degenerate classical ground states including two…
Noncoplanar multi-k states in frustrated spinel and kagome magnets
M. E. Zhitomirsky, M. V. Gvozdikova, T. Ziman
We investigate analytically and numerically the classical ground states of frustrated Heisenberg models on pyrochlore and kagome lattices in zero and finite magnetic fields. Each m…
Quantum versus thermal fluctuations in the fcc antiferromagnet: alternative routes to order by disorder
R. Schick, T. Ziman, M. E. Zhitomirsky
In frustrated magnetic systems with competing interactions fluctuations can lift the residual accidental degeneracy. We argue that the state selection may have different outcomes f…
Magnetic order and single-ion anisotropy in TbGaO
R. Wawrzyńczak, B. Tomasello, P. Manuel +8
Terbium gallium garnet (TGG), TbGaO, is well known for its applications in laser optics, but also exhibits complex low-temperature magnetism that is not yet fully un…
Magnetic oscillations measure interlayer coupling in cuprate superconductors
Pavel D. Grigoriev, Timothy Ziman
The magnetic oscillations in YBCO high-temperature superconductors have been widely studied over the last decade and consist of three equidistant low frequencies with a central fre…
Linarite - a quasi-critical J-J chain
Eron Cemal, Mechthild Enderle, Reinhard K. Kremer +5
The mineral linarite, PbCuSO(OH), is a spin 1/2 chain with frustrating nearest neighbor ferromagnetic and next-nearest neighbor antiferromagnetic exchange interactions. Our…
Spin waves in the AF state of the - Hubbard model on the fcc lattice: competing interactions, frustration, and instabilities
Avinash Singh, Shubhajyoti Mohapatra, Timothy Ziman +1
Spin waves in the type-III ordered antiferromagnetic state of the frustrated - Hubbard model on the fcc lattice are calculated to investigate finite--induced competing in…
Analysis of the spin Hall effect in CuIr alloys: Combined approach of density functional theory and Hartree-Fock approximation
Zhuo Xu, Bo Gu, Michiyasu Mori +2
We analyze the spin Hall effect in CuIr alloys in theory by the combined approach of the density functional theory (DFT) and Hartree-Fock (HF) approximation. The SHA is obtained to…
Glassy Spin Freezing and Gapless Spin Dynamics in a Spatially Anisotropic Triangular Antiferromagnet Ag2MnO2
S. Ji, J. -H. Kim, Y. Qiu +6
Using elastic and inelastic neutron scattering techniques, we show that upon cooling a spatially anisotropic triangular antiferromagnet AgMnO freezes below K…
Comment on "Magnetic Percolation and the Phase Diagram of the disordered RKKY model"
Richard Bouzerar, Georges Bouzerar, Timothy Ziman
We comment on the recent paper "Magnetic Percolation and the Phase Diagram of the disordered RKKY model." D.J. Priour and S. Das Sarma, Phys Rev. Lett.{\bf 97}, 127201 (2006); cond…
Model for vacancy-induced d ferromagnetism in oxide compounds
Georges Bouzerar, Timothy Ziman
We propose a model with few parameters, for vacancy-induced ferromagnetism based on a correlated model for anions (oxygen orbitals) with random potentials that represent cation vac…
Why RKKY exchange integrals are inappropriate to describe ferromagnetism in diluted magnetic semiconductors
Richard Bouzerar, Georges Bouzerar, Timothy Ziman
We calculate Curie temperatures and study the stability of ferromagnetism in diluted magnetic materials, taking as a model for the exchange between magnetic impurities a damped Rud…
Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems
Olivier Cepas, Timothy Ziman
We consider the absorption of light with emission of one S(tot)=1 magnetic excitation in systems with a spin gap induced by quantum fluctuations. We argue that an electric dipole t…
Dzyaloshinski-Moriya Interaction in the 2D Spin Gap System SrCu2(BO3)2
O. Cepas, K. Kakurai, L. P. Regnault +6
The Dzyaloshinski-Moriya interaction partially lifts the magnetic frustration of the spin-1/2 oxide SrCu2(BO3)2. It explains the fine structure of the excited triplet state and its…
An Electron Spin Resonance Selection Rule for Spin-Gapped Systems
Toru Sakai, Olivier Cepas, Timothy Ziman
The direct electron spin resonance (ESR) absorption between a singlet ground state and the triplet excited states of spin gap systems is investigated. Such an absorption, which is…
Minimal model to describe the magnetism of
G. Bouzerar, O. Legeza, T. Ziman
We show that to describe properly the low energy excitations of one must include the effects of a transverse antiferromagnetic coupling, which is estimated to be $J_{\p…