Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-03-20
Phys. Rev. B 64, 054412 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages (RevTeX), 8 figures
Scientific paper
10.1103/PhysRevB.64.054412
We present the results of measurements of the thermal conductivity of the quasi one-dimensional spin S=1/2 chain compound SrCuO_2 in the temperature range between 0.4 and 300 K along the directions parallel and perpendicular to the chains. An anomalously enhanced thermal conductivity is observed along the chains. The analysis of the present data and a comparison with analogous recent results for Sr_2CuO_3 and other similar materials demonstrates that this behavior is generic for cuprates with copper-oxygen chains and strong intrachain interactions. The observed anomalies are attributed to the one-dimensional energy transport by spin excitations (spinons), limited by the interaction between spin and lattice excitations. The energy transport along the spin chains has a non-diffusive character, in agreement with theoretical predictions for integrable models.
Gianno K.
Ott Hans-Rudolf
Revcolevschi Alexandre
Sologubenko A. V.
Vietkine A.
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