Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 77, Issue 3, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.034607
Keywords
ballistic thermal conduction; thermal conductivity; one-dimensional quantum spin system; Sr2CuO3
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We have measured the thermal conductivity of the one-dimensional (ID) 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 ID 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.
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