Field-Dependent Thermal Transport in the Haldane Chain Compound NENP

A. V. Sologubenko, T. Lorenz, J. A. Mydosh, A. Rosch, K. C. Shortsleeves, and M. M. Turnbull
Phys. Rev. Lett. 100, 137202 – Published 2 April 2008

Abstract

We present a study of the magnetic field-dependent thermal transport in the spin S=1 chain material Ni(C2H8N2)2NO2(ClO4) (NENP). The measured thermal conductivity is found to be very sensitive to the field-induced changes in the spin excitation spectrum. The magnetic contribution to the total heat conductivity is analyzed in terms of a quasiparticle model, and we obtain a temperature and momentum independent mean free path. This implies that the motion of quasiparticles is effectively three dimensional despite the tiny interchain coupling.

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  • Received 24 December 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.137202

©2008 American Physical Society

Authors & Affiliations

A. V. Sologubenko1, T. Lorenz1, J. A. Mydosh1, A. Rosch2, K. C. Shortsleeves3, and M. M. Turnbull3

  • 1II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
  • 2Institut für Theoretische Physik, Universität zu Köln, 50937 Köln, Germany
  • 3Carlson School of Chemistry and Biochemistry, Clark University, Worcester, Massachusetts 01610, USA

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Vol. 100, Iss. 13 — 4 April 2008

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