Ballistic heat transport of quantum spin excitations as seen in SrCuO2

Details Ballistic heat transport of quantum spin excitations as seen in SrCuO2 Ballistic heat transport of quantum spin excitations as seen in SrCuO2

2009-08-12

arxiv.org/abs/0908.1681v2

Phys. Rev. B 81, 020405(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.81.020405

Fundamental conservation laws predict ballistic, i.e., dissipationless transport behaviour 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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