Experimental Study of the Thermal Transport in CsNiF3 - An S=1 Quantum Chain

0440208 - ÚFM 2015 RIV PL eng J - Článek v odborném periodiku
Tkáč, V. - Orendáčová, A. - Orendáč, M. - Legut, Dominik - Tibenská, K. - Feher, A. - Poirier, M. - Meisel, M. W.
Experimental Study of the Thermal Transport in CsNiF3 - An S=1 Quantum Chain.
ACTA PHYSICA POLONICA A. Roč. 121, 5-6 (2012), s. 1098-1101. ISSN 0587-4246. E-ISSN 1898-794X.
[European Conference on Physics of Magnetism (PM). Poznaň, 27.06.2011-01.07.2011]
Institucionální podpora: RVO:68081723
Klíčová slova: thermal transport * lattice specif heat * phonons * ab initio * Debye model
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 0.531, rok: 2012

The heat transport in a single-crystal of CsNiF3 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. CsNiF3 represents an S = 1 quasi-one-dimensional XY ferromagnet with the intra-chain exchange coupling J/k(B) approximate to 24 K, single-ion anisotropy D/k(B) approximate to 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 not equal 0 was obtained, indicating that magnons act as scattering centers for phonons.
Trvalý link: http://hdl.handle.net/11104/0243332