Thermal Hall Effect in a Phonon-Glass Ba sub(3) CuSb sub(2) O sub(9)

A distinct thermal Hall signal is observed in a quantum spin liquid candidate Ba sub(3) CuSb sub(2) O sub(9). The transverse thermal conductivity shows a power-law temperature dependence below 50 K, where a spin gap opens. We suggest that because of the very low longitudinal thermal conductivity and...

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Bibliographic Details
Published in:Physical review letters 2017-04, Vol.118 (14)
Main Authors: Sugii, K, Shimozawa, M, Watanabe, D, Suzuki, Y, Halim, M, Kimata, M, Matsumoto, Y, Nakatsuji, S, Yamashita, M
Format: Article
Language:English
Subjects:
Copper
Hall effect
Heat transfer
Phonons
Scattering
Spin liquid
Temperature dependence
Thermal conductivity
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Summary:A distinct thermal Hall signal is observed in a quantum spin liquid candidate Ba sub(3) CuSb sub(2) O sub(9). The transverse thermal conductivity shows a power-law temperature dependence below 50 K, where a spin gap opens. We suggest that because of the very low longitudinal thermal conductivity and the thermal Hall signals, a phonon Hall effect is induced by strong phonon scattering of orphan Cu super(2+) spins formed in the random domains of the Cu super(2+)-Sb super(5+) dumbbells in Ba sub(3) CuSb sub(2) O sub(9).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.118.145902