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

• Authors: V. Tkáč , A. Orendáčová , M. Orendáč , D. Legut , K. Tibenská , A. Feher , M. Poirier , M. Meisel
• Languages of publication: 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

EN

75.30.Et; 75.40.Cx; 66.70.Lm; 75.30.Ds

Discipline

• 75.30.Et: Exchange and superexchange interactions(see also 71.70.Gm Exchange interactions)
• 75.30.Ds: Spin waves(for spin-wave resonance, see 76.50.+g)
• 66.70.Lm: Other systems such as ionic crystals, molecular crystals, nanotubes, etc.
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1098-1101

Dates

published

2012-05

Contributors

author

V. Tkáč

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

A. Orendáčová

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

M. Orendáč

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

D. Legut

• Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, CZ-616 62 Brno, Czech Republic

author

K. Tibenská

• Faculty of Aeronautics, Technical University, Rampová 7, 041 21 Košice, Slovakia

author

A. Feher

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

M. Poirier

• Regroupement Québécois sur les Matériaux de Pointe, Département de Physique, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada

author

M. Meisel

• Department of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, USA

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Identifiers

DOI

10.12693/APhysPolA.121.1098