Heat capacity reveals the physics of a frustrated spin tube

Ivanov, N.B., Schnack, J., Schnalle, R., Richter, J., Kogerler, P., Newton, G., Cronin, L. , Oshima, Y. and Nojiri, H. (2010) Heat capacity reveals the physics of a frustrated spin tube. Physical Review Letters, 105(3), 037206. (doi:10.1103/PhysRevLett.105.037206)

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Abstract

We report on theoretical and experimental results concerning the low-temperature specific heat of the frustrated spin-tube material [(CuCl(2)tachH)(3)Cl]Cl-2 (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 quasione- 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.

Item Type:Articles
Keywords:ANTIFERROMAGNETIC UNIFORM BEHAVIOR HEISENBERG CHAIN LOW-TEMPERATURE NANOTUBES STATE SYSTEMS THERMODYNAMICS
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cronin, Professor Leroy
Authors: Ivanov, N.B., Schnack, J., Schnalle, R., Richter, J., Kogerler, P., Newton, G., Cronin, L., Oshima, Y., and Nojiri, H.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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