Magnetothermal Transport in the Spin-12 Chains of Copper Pyrazine Dinitrate

A. V. Sologubenko, K. Berggold, T. Lorenz, A. Rosch, E. Shimshoni, M. D. Phillips, and M. M. Turnbull
Phys. Rev. Lett. 98, 107201 – Published 5 March 2007

Abstract

We present experiments on the thermal transport in the spin-12 chain compound copper pyrazine dinitrate Cu(C4H4N2)(NO3)2. The heat conductivity shows a surprisingly strong dependence on the applied magnetic field B, characterized at low temperatures by two main features. The first one appearing at low B is a characteristic dip located at μBBkBT, that may arise from umklapp scattering. The second one is a plateaulike feature in the quantum critical regime, μB|BBc|<kBT, where Bc is the saturation field at T=0. The latter feature clearly points towards a momentum and field-independent mean free path of the spin excitations, contrary to theoretical expectations.

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  • Received 19 December 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.107201

©2007 American Physical Society

Authors & Affiliations

A. V. Sologubenko1, K. Berggold1, T. Lorenz1, A. Rosch2, E. Shimshoni3, M. D. Phillips4, and M. M. Turnbull4

  • 1II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
  • 2Institut für Theoretische Physik, Universität zu Köln, 50937 Köln, Germany
  • 3Department of Mathematics-Physics, University of Haifa at Oranim, Tivon 36006, Israel
  • 4Carlson School of Chemistry and Department of Physics, Clark University, Worcester, Massachusetts 01610, USA

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Vol. 98, Iss. 10 — 9 March 2007

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