paper

Halperin-Saslow modes as the origin of the low temperature anomaly in $N i G a_{2} S_{4}$

arXiv:0805.3347 · doi:10.1103/PhysRevB.79.140402

Abstract

The absence of magnetic long range order in the triangular lattice spin-1 antiferromagnet $N i G a$ _2 $S$ _4 $ha s p r o m pt e d t h ese a r c h f or an o v e l q u an t u m g r o u n d s t a t e . I n p a r t i c u l a r, se v er a l e x p er im e n t ss ug g es tt h e p r ese n ceo f a l in e a r l y d i s p er s in g m o d e d es p i t e n o l o n g - r an g e ma g n e t i cor d er . W es h o w t ha tt h e an o ma l o u s l o w t e m p er a t u r e p r o p er t i eso f N i G a$ _2 $S$ _4$ can naturally be explained by the formulation developed by Halperin and Saslow where the linearly dispersing Halperin-Saslow mode may exist in the background of frozen spin moments and zero net magnetization. We provide highly non-trivial consistency checks on the existing experimental data and suggest future experiments that can further confirm the existence of the Halperin-Saslow mode. Our results place strong constraints on any microscopic theory of this material.

5 pages, 1 figure

Halperin-Saslow modes as the origin of the low temperature anomaly in NiGa2​S4​

Abstract

Halperin-Saslow modes as the origin of the low temperature anomaly in $N i G a_{2} S_{4}$