Large magnetothermal conductivity in GdBaCo_{2}O_{5+x} single crystals

Details Large magnetothermal conductivity in GdBaCo_{2}O_{5+x} single crystals Large magnetothermal conductivity in GdBaCo_{2}O_{5+x} single crystals

2008-01-05

arxiv.org/abs/0801.0779v1

Phys. Rev. B 77, 054436 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.77.054436

To study the effects of paramagnetic spins on phonons, both the in-plane and the c-axis heat transport of GdBaCo_{2}O_{5+x} (GBCO) single crystals are measured at low temperature down to 0.36 K and in magnetic field up to 16 T. It is found that the phonon heat transport is very strongly affected by the magnetic field and nearly 5 times increase of the thermal conductivity in several Tesla field is observed at 0.36 K. It appears that phonons are resonantly scattered by paramagnetic spins in zero field and the application of magnetic field removes such strong scattering, but the detailed mechanism is to be elucidated.

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