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2012 | 121 | 5-6 | 1098-1101
Article title

Experimental Study of the Thermal Transport in CsNiF_3 - An S = 1 Quantum Chain

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EN
Abstracts
EN
The heat transport in a single-crystal of CsNiF_3 has been performed in the temperature range from 2 K to 7 K in a zero magnetic field, B = 0, as well as in sufficiently large magnetic fields, B = 6 T and 9 T, inducing the ferromagnetic ground state along the hard c-axis. CsNiF_3 represents an S = 1 quasi-one-dimensional XY ferromagnet with the intra-chain exchange coupling J/k_{B} ≈ 24 K, single-ion anisotropy D/k_{B} ≈ 8 K, and ordering temperature T_{N} = 2.7 K. Comparison of the phonon and magnon velocities suggests that phonons are the main heat carriers in this magnetic insulator. The thermal conductivity in B = 0 was analysed in the frame of a standard Debye model. The temperature dependence of the effective phonon mean free path was calculated from the experimental data, and the enhancement of the phonon mean free path in B ≠ 0 was obtained, indicating that magnons act as scattering centers for phonons.
Keywords
Year
Volume
121
Issue
5-6
Pages
1098-1101
Physical description
Dates
published
2012-05
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv121n5-6p32kz
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