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J. Phys. Soc. Jpn. 77 (2008) 034607 (6 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Evidence for Ballistic Thermal Conduction in the One-Dimensional S=1/2 Heisenberg Antiferromagnetic Spin System Sr2CuO3

Takayuki Kawamata1,2, Nobuo Takahashi1, Tadashi Adachi1,2, Takashi Noji1,2, Kazutaka Kudo3, Norio Kobayashi3, and Yoji Koike1,2

1Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Aramaki, Aoba-ku, Sendai 980-8579
2CREST, Japan Science and Technology Agency (JST)
3Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577

(Received July 16, 2007; Accepted January 18, 2008; Published March 10, 2008)

We have measured the thermal conductivity of the one-dimensional (1D) S=1/2 Heisenberg antiferromagnetic spin system of Sr2Cu1-xPdxO3 single crystals including nonmagnetic impurities of Pd2+. It has been found that the mean free path of spinons along the 1D spin chain at low temperatures is very close to the average length of finite spin chains between spin defects estimated from the magnetic susceptibility measurements. This proves that the thermal conduction due to spinons at low temperatures in Sr2CuO3 is ballistic as theoretically expected [Zotos et al.: Phys. Rev. Lett. 55 (1997) 11029]. ©2008 The Physical Society of Japan

KEYWORDS: ballistic thermal conduction, thermal conductivity, one-dimensional quantum spin system, Sr2CuO3
URL: http://jpsj.ipap.jp/link?JPSJ/77/034607/
DOI: 10.1143/JPSJ.77.034607


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