Low-temperature heat transport of the layered spin-dimer compound Ba_3Mn_2O_8

W. P. Ke; X. M. Wang; C. Fan; Z. Y. Zhao; X. G. Liu; L. M. Chen; Q. J. Li; X. Zhao; X. F. Sun

doi:10.1103/PhysRevB.84.094440

Low-temperature heat transport of the layered spin-dimer compound Ba_3Mn_2O_8

Strongly Correlated Electrons 2011-10-20 v1

Authors: W. P. Ke , X. M. Wang , C. Fan , Z. Y. Zhao , X. G. Liu , L. M. Chen , Q. J. Li , X. Zhao , X. F. Sun

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Abstract

We report the study on the low-temperature heat transport of Ba_3Mn_2O_8 single crystal, a layered spin-dimer compound exhibiting the magnetic-field-induced magnetic order or the magnon Bose-Einstein condensation. The thermal conductivities (\kappa) along both the ab plane and the c axis show nearly isotropic dependence on magnetic field, that is, \kappa is strongly suppressed with increasing field, particularly at the critical fields of magnetic phase transitions. These results indicate that the magnetic excitations play a role of scattering phonons and the scattering effect is enhanced when the magnetic field closes the gap in the spin spectrum. In addition, the magnons in the BEC state of this materials do not show notable ability of carrying heat.

Keywords

low-temperature heat transport spin-dimer compound Ba3Mn2O8 magnon Bose-Einstein condensation thermal conductivity magnetic phase transition phonon scattering

Cite

@article{arxiv.1109.0587,
  title  = {Low-temperature heat transport of the layered spin-dimer compound Ba_3Mn_2O_8},
  author = {W. P. Ke and X. M. Wang and C. Fan and Z. Y. Zhao and X. G. Liu and L. M. Chen and Q. J. Li and X. Zhao and X. F. Sun},
  journal= {arXiv preprint arXiv:1109.0587},
  year   = {2011}
}

Comments

6 pages, 6 figures, accepted for publication in Phys. Rev. B

Low-temperature heat transport of the layered spin-dimer compound Ba_3Mn_2O_8

Abstract

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