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

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Tkáč V., Orendáčová A., Orendáč M., Legut D., Tibenská K., Feher A., Poirier M., Meisel M.

Acta Physica Polonica A

2012

vol. 121

issue 5-6

1098-1101

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.

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1 Acta Physica Polonica A

1 2012

1 Feher A.

1 Legut D.

1 Meisel M.

1 Orendáč M.

1 Orendáčová A.

1 Poirier M.

1 Tibenská K.

1 Tkáč V.

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