期刊
PHYSICAL REVIEW B
卷 81, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.020405
关键词
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资金
- Deutsche Forschungsgemeinschaft [HE3439/7]
- Forschergruppe FOR912 [HE3439/8]
- European Commission [FP6-032980]
Fundamental conservation laws predict ballistic, i.e., dissipationless transport behavior in one-dimensional quantum magnets. Experimental evidence, however, for such anomalous transport has been lacking ever since. Here we provide experimental evidence for ballistic heat transport in a S=1/2 Heisenberg chain. In particular, we investigate high purity samples of the chain cuprate SrCuO2 and observe a huge magnetic heat conductivity kappa(mag). An extremely large spinon mean-free path of more than a micrometer demonstrates that kappa(mag) is only limited by extrinsic scattering processes which is a clear signature of ballistic transport in the underlying spin model.
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