Heat capacity uncovers physics of a frustrated spin tube

Details Heat capacity uncovers physics of a frustrated spin tube Heat capacity uncovers physics of a frustrated spin tube

2010-04-14

arxiv.org/abs/1004.2373v1

Phys. Rev. Lett. 105 (2010) 037206

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 6 figures

Scientific paper

10.1103/PhysRevLett.105.037206

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.

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