Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-08-18
Phys. Rev. B 82, 094405 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.82.094405
We study the low-temperature heat transport of HoMnO_3 single crystals to probe the magnetic structures and their transitions induced by magnetic field. It is found that the low-T thermal conductivity (\kappa) shows very strong magnetic-field dependence, with the strongest suppression of nearly 90% and the biggest increase of 20 times of \kappa compared to its zero-field value. In particular, some ``dip"-like features show up in \kappa(H) isotherms for field along both the ab plane and the c axis. These behaviors are found to shed new light on the complex H-T phase diagram and the field-induced re-orientations of Mn^{3+} and Ho^{3+} spin structures. The results also demonstrate a significant spin-phonon coupling in this multiferroic compound.
Fan Chang
Ke W. P.
Liu X. G.
Sun X. F.
Tao Wang
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