Heat Capacity Reveals the Physics of a Frustrated Spin Tube
Authors:
- Nedko B. IvanovNINedko B. Ivanov
- Jürgen SchnackJSJürgen Schnack
- Roman SchnalleRSRoman Schnalle
- Johannes RichterJRJohannes Richter
- Paul KögerlerPKPaul Kögerler
- Graham N. NewtonGNGraham N. Newton
- Leroy CroninLCLeroy Cronin
- Yugo OshimaYOYugo Oshima
- Hiroyuki NojiriHNHiroyuki Nojiri
- 16 July 2010
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 105 (3) , 037206
Abstract
We report on theoretical and experimental results concerning the low-temperature specific heat of the frustrated spin-tube material [(CuCl2tachH)3Cl]Cl2 (tach denotes 1,3,5-triaminocyclohexane). 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, around 2~K the composite spin structure of the chain is revealed through a Schottky-type peak in the specific heat. 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
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