Novikov, V. V. and Matovnikov, A. V. and Mitroshenkov, N. V. and Morozov, A. V. and Pilipenko, K. S. and Plokhikh, I. V. and Pfitzner, A. and Shevelkov, A. V. (2020) Ferromagnetic phase transition and anomalies of thermodynamic characteristics of copper-deficient EuCu2P2 at low temperatures. JOURNAL OF ALLOYS AND COMPOUNDS, 844: 156150. ISSN 0925-8388, 1873-4669
Full text not available from this repository. (Request a copy)Abstract
A homogeneous powder sample of EuCu2P2 was synthesized from the elements by a two-step high-temperature ampule technique. X-ray powder diffraction analysis have shown that the compound belongs to the ThCr2Si2 structure type and features copper deficiency. The study of temperature changes of heat capacity, Cp(T) (2-300 K), and unit cell parameters, a(T) and c(T) and volume V-u(T) (5-300 K), revealed a pronounced anomaly at about T-Cmax = 44 K evidencing the phase transition to the ferromagnetic state. Detailed analyses of the extracted excess (magnetic) components of EuCu2P2 thermodynamic characteristics, C-m(T) and Delta(Vm)(T), have been performed using the Debye-Einstein and mean field theory approaches. We have found that the anomalous nature of C-m(T) and Delta(Vm)(T) at T < T-Cmax. is caused by the effect of the internal magnetic field on the magnetic moments of Eu2+ ions, and, to a lesser extent, by the splitting of the ground state of Eu2+ ions. Noticeable anisotropy of the EuCu2P2 thermal expansion at temperatures below TCmax as well as a significant effect of the anharmonicity of lattice vibrations on the thermal properties of EuCu2P2 at elevated temperatures have been documented. (c) 2020 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | THERMAL-EXPANSION; MAGNETIC ORDER; HEAT-CAPACITY; VALENCE; Europium; Low temperatures; Heat capacity; Thermal expansion; Debye-Einstein model; Mean field theory; Gruneisen parameter |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Arno Pfitzner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Mar 2021 08:50 |
| Last Modified: | 05 Mar 2021 08:50 |
| URI: | https://pred.uni-regensburg.de/id/eprint/43171 |
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