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Magnetocaloric Effect in Anisotropic Mixed Spin1/2–1 System: Pair Approximation Method

Communications in Theoretical Physics 2019年第11期71卷 1370-1378页

作者： Abderrazak Boubekri Moulay Youssef El Hafidi Mohamed El Hafidi Laboratory of Condensed Matter Physics Faculty of Sciences Ben M’sik Hassan II University of Casablanca

We use the Pair Approximation method to analyze the magnetic and magnetocaloric behaviors of diluted mixed spin SA=1 and spin SB=1/2 with the anisotropic Heisenberg model, on a cubic lattice with coordination number z=6. Our system is described in presence of an external magnetic field;the phase diagram and thermodynamic properties related to the concentration of magnetic atom(A or B) and the single ion anisotropy are constructed and *** attention is paid to magnetocaloric properties provided by isothermal entropy change as well as the cooling capacity. These cooling power keys are plotted and discussed as a function of interaction anisotropy and magnetic component concentration of two sublattices ions A and B. Numerical results show a double peak structure in the entropy change curve and the inverse magnetocaloric effect related to the presence of the negative single-ion anisotropy.

关键词： anisotropic Heisenberg model dilution entropy change mixed spin system inverse magnetocaloric effect pair approximation magnetic gruneisen ratio

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Ultrasonic Attenuation in Calcium Oxide

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Advances in Materials Physics and Chemistry 2011年第2期1卷 44-49页

作者： Jitendra Kumar Kailash R. Sanjeev Kumar Shrivastava Devraj Singh Virendra Kumar 不详

Ultrasonic attenuation studies can be used to characterize material not only after production but during processing as well. The most important causes of ultrasonic attenuation in solids are electron-phonon, phonon-phonon interaction and that due to thermo elastic relaxation. The two dominant processes that will give rise to appreciable ultrasonic attenuation at higher temperature are the phonon-phonon interaction also known as Akhiezer loss and that due to thermo elastic relaxation are observed in calcium oxide crystal. At frequencies of ultrasonic range and at higher temperatures in solids, phonon-phonon interaction mechanism is dominating cause for attenuation. Ultrasonic attenuation due to phonon-phonon interaction (α/f2)p-p and thermo elastic relaxation (α/f2)th are evaluated in Calcium Oxide crystal up to an elevated temperature from 100 K - 1500 K along , and crystallographic directions. Temperature dependence of ultrasonic attenuation along different crystallographic direction reveals some typical characteristic features.

关键词： Attenuation Thermo Elastic Relaxation Phonon-Phonon Interaction Akheiser Loss gruneisen Constants

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