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On the Ordering of Na Ions in NaCoO
M. Roger, D. J. P. Morris, D. A. Tennant +8
The influence of electrostatic interactions on the ordering of sodium ions in NaCoO is studied theoretically through Monte-Carlo simulations. For large small di- or tri…
Spin gaps and magnetic structure of NaxCoO2
L. M. Helme, A. T. Boothroyd, R. Coldea +4
We present two experiments that provide information on spin anisotropy and the magnetic structure of NaxCoO2. First, we report low-energy neutron inelastic scattering measurements…
Where is the spectral weight in magnetic neutron scattering in the cuprates?
J. Lorenzana, G. Seibold, R. Coldea
We present estimates in the Hubbard and Heisenberg models for the spectral weight in magnetic neutron scattering experiments on the cuprates. With the aid of spin-wave theory and t…
Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets
Weihong Zheng, John O. Fjaerestad, Rajiv R. P. Singh +2
We use series expansions to study the excitation spectra of spin-1/2 antiferromagnets on anisotropic triangular lattices. For the isotropic triangular lattice model (TLM) the high-…
Bose-Einstein Condensation of Magnons in Cs2CuCl4
T. Radu, H. Wilhelm, V. Yushankhai +5
We report on results of specific heat measurements on single crystals of the frustrated quasi-2D spin-1/2 antiferromagnet Cs_2CuCl_4 (T_N=0.595 K) in external magnetic fields B<12…
Two-magnon excitations observed by neutron scattering in the two-dimensional spin-5/2 Heisenberg antiferromagnet Rb2MnF4
T. Huberman, R. Coldea, R. A. Cowley +4
The low-temperature magnetic excitations of the two-dimensional spin-5/2 square-lattice Heisenberg antiferromagnet Rb2MnF4 have been probed using pulsed inelastic neutron scatterin…