Heat Capacity Reveals the Physics of a Frustrated Spin Tube

Nedko B. Ivanov, Jürgen Schnack, Roman Schnalle, Johannes Richter, Paul Kögerler, Graham N. Newton, Leroy Cronin, Yugo Oshima, and Hiroyuki Nojiri
Phys. Rev. Lett. 105, 037206 – Published 16 July 2010

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.

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  • Received 12 April 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.037206

©2010 American Physical Society

Authors & Affiliations

Nedko B. Ivanov1,2,*, Jürgen Schnack2,†, Roman Schnalle2, Johannes Richter3, Paul Kögerler4, Graham N. Newton5, Leroy Cronin5, Yugo Oshima6, and Hiroyuki Nojiri6,‡

  • 1Institute of Solid State Physics, Bulgarian Academy of Sciences, Tzarigradsko chaussee 72, 1784 Sofia, Bulgaria
  • 2Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany
  • 3Institut für Theoretische Physik, Universität Magdeburg, Post Office Box 4120, D-39016 Magdeburg, Germany
  • 4Institut für Anorganische Chemie, RWTH Aachen, Landoltweg 1, D-52074 Aachen, Germany
  • 5Department of Chemistry, The University of Glasgow, Glasgow, G12 8QQ, United Kingdom
  • 6Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan

  • *Nedko.Ivanov@Physik.Uni-Magdeburg.DE
  • jschnack@uni-bielefeld.de
  • nojiri@imr.tohoku.ac.jp

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Issue

Vol. 105, Iss. 3 — 16 July 2010

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