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APS » Journals » Phys. Rev. B » Volume 62 » Issue 10
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Phys. Rev. B 62, R6108–R6111 (2000)

Thermal conductivity and specific heat of the linear chain cuprate Sr2CuO3: Evidence for thermal transport via spinons

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A. V. Sologubenko, E. Felder, K. Giannò, and H. R. Ott
Laboratorium für Festkörperphysik, ETH Hönggerberg, CH-8093 Zürich, Switzerland

A. Vietkine and A. Revcolevschi
Laboratoire de Physico-Chimie des Solides, Université Paris-Sud, 91405 Orsay, France

Received 5 May 2000; published in the issue dated 1 September 2000

We report measurements of the specific heat and the thermal conductivity of the model Heisenberg spin-1/2 chain cuprate Sr2CuO3 at low temperatures. In addition to a nearly isotropic phonon heat transport, we find a quasi-one-dimensional excess thermal conductivity along the chain direction, most likely associated with spin excitations (spinons). The spinon energy current is limited mainly by scattering on defects and phonons. Analyzing the specific heat data, the intrachain magnetic exchange J/kB is estimated to be ≃2650 K.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.62.R6108
DOI:
10.1103/PhysRevB.62.R6108
PACS:
75.40.Gb, 66.70.+f, 74.72.Jt
 
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