Magnetic Specific Heat of Pb_{1-x}Eu_xTe

• Authors: M. Górska , A. Łusakowski , A. Jędrzejczak , Z. Gołacki , J. Anderson , H. Balci
• Languages of publication: EN

Abstracts

EN

The temperature dependence of the magnetic specific heat was studied experimentally and theoretically in the semimagnetic semiconductor Pb_{1-x}Eu_xTe for x=0.027 and x=0.073, over the temperature range from 0.5 K to 15 K, in magnetic fields up to 2 T. In zero magnetic field at about 2 K there was a broad maximum in the magnetic specific heat, which was much higher than that predicted by the model of superexchange interaction between nearest neighbors; the maximum values increased with magnetic field. The experimental data were analyzed in the framework of a model which takes into account the spin splitting of the ground state of a single Eu2+ ion in the presence of local lattice distortions in the Pb_{1-x}Eu_xTe mixed crystal. The model describes well the experimental data, especially for lower x-values, where the contribution from singlets dominates.

Keywords

EN

71.70.-d; 75.40.Cx

Discipline

• 71.70.-d: Level splitting and interactions(see also 73.20.-r Surface and interface electron states; 75.30.Et Exchange and superexchange interactions)
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 105
• Issue: 6
• Pages: 631-636

Dates

published

2004-06

received

2004-05-28

Contributors

author

M. Górska

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

A. Łusakowski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

A. Jędrzejczak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

Z. Gołacki

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland

author

J. Anderson

• Department of Physics, University of Maryland, College Park, MD 20742, USA

author

H. Balci

• Department of Physics, University of Maryland, College Park, MD 20742, USA

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Identifiers

DOI

10.12693/APhysPolA.105.631