Gaussian superconducting fluctuations, thermal transport, and the Nernst effect
(2002)
Liquid-gas and other unusual thermal phase transitions in some large-N magnets
(2002)
Order by distortion and string modes in pyrochlore antiferromagnets.
Physical review letters 88:6 (2002) 067203
Abstract:
We study the effects of magnetoelastic couplings on pyrochlore antiferromagnets. We employ Landau theory, extending an investigation begun by Yamashita and Ueda for the case of S = 1, and classical analyses to argue that such couplings generate bond order via a spin-Peierls transition. This is followed by, or concurrent with, a transition into one of several possible low-temperature Néel phases, with most simply collinear, but also coplanar or mixed spin patterns. In a collinear Néel phase, a dispersionless stringlike magnon mode dominates the resulting excitation spectrum, providing a distinctive signature of the parent geometrically frustrated state. We comment on the experimental situation.Short-ranged resonating valence bond physics, quantum dimer models, and Ising gauge theories
Physical Review B American Physical Society (APS) 65:2 (2002) 024504