Thermodynamic and Magnetotransport Properties of High Quality Na_{0.77}CoO_{2} Single Crystals

• Authors: A. Baran , A. Zorkovská , M. Kajňaková , C. Lin , A. Feher
• Languages of publication: EN

Abstracts

EN

Heat capacity and electrical resistivity of high-quality Na_{0.77}CoO_{2} single crystals was systematically studied as a function of temperature and magnetic field. Anomalies at 20 K have been observed both in the heat capacity and the electrical resistivity. The broad bump in the heat capacity indicates a smeared magnetic phase transition. Magnetic fields up to 9 T, oriented perpendicularly to the ab plane, reduce the temperature of this anomaly in accordance with the assumption of A-type antiferromagnetic ordering. The low temperature upturn observed in resistivity below 20 K for slow cooling is also suppressed by the magnetic field. This anomaly is probably the consequence of the interplay of several different mechanisms, including the Kondo effect, electron-electron interactions, and electron-phonon scattering.

Keywords

EN

75.20.Hr; 75.40.Cx; 75.47.-m

Discipline

• 75.47.-m: Magnetotransport phenomena; materials for magnetotransport(for spintronics, see 85.75.-d; see also 72.25.-b Spin polarized transport; 72.15.Gd Galvanomagnetic and other magnetotransport effects; for magnetotransport effects in thin films, see 73.50.Jt; see also 73.43.Qt Magnetoresistance)
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
• 75.20.Hr: Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions(for Kondo effect and scattering mechanisms in electronic conduction, see 72.15.Qm and 72.10.Fk)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 360-361

Dates

published

2014-07

Contributors

author

A. Baran

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

author

A. Zorkovská

• Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01 Košice, Slovakia

author

M. Kajňaková

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

author

C. Lin

• Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D- 70569 Stuttgart, Germany

author

A. Feher

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

References

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Identifiers

DOI

10.12693/APhysPolA.126.360