Heat capacity uncovers physics of a frustrated spin tube
Abstract
We report on refined experimental results concerning the low-temperature specific heat of the frustrated spin tube material [(CuCl2tachH)3Cl]Cl2. This substance turns out to be an unusually perfect spin tube system which allows to study the physics of quasi-one dimensional antiferromagnetic structures in rather general terms. An analysis of the specific heat data demonstrates that at low enough temperatures the system exhibits a Tomonaga-Luttinger liquid behavior corresponding to an effective spin-3/2 antiferromagnetic Heisenberg chain with short-range exchange interactions. On the other hand, at somewhat elevated temperatures the composite spin structure of the chain is revealed through a Schottky-type peak in the specific heat located around 2 K. We argue that the dominating contribution to the peak originates from gapped magnon-type excitations related to the internal degrees of freedom of the rung spins.
Keywords
Cite
@article{arxiv.1004.2373,
title = {Heat capacity uncovers physics of a frustrated spin tube},
author = {N. B. Ivanov and J. Schnack and R. Schnalle and J. Richter and P. Koegerler and G. N. Newton and L. Cronin and Y. Oshima and Hiroyuki Nojiri},
journal= {arXiv preprint arXiv:1004.2373},
year = {2010}
}
Comments
4+ pages, 6 figures