Multicaloric response tuned by electric field in cylindrical MnAs/PZT magnetoelectric composite Abdulkarim A. Amirov, Maksim A. Koliushenkov, Abdula A. Mukhuchev, Dibir M. Yusupov, Valeriya V. Govorina, Dmitriy S. Neznakhin, Gennady A. Govor, Akhmed M. Aliev Journal of Applied Physics, 2024 The possibility observation of the electric field controlled multicaloric response through quasi-isostatic compression as a result of the converse piezoelectric effect was demonstrated on the cylindrical type magnetoelectric composite MnAs/PZT. It was shown that an electric voltage of 100 V corresponding to an electric field of E ∼0.3 kV/mm applied to the walls of the piezoelectric component PZT of the MnAs/PZT composite contributes to an increase in the maximum adiabatic temperature change by 0.2 K in the temperature range of the magnetostructural phase transition of MnAs ∼317 K at a magnetic field change of 1.8 T. Numerical analysis using the finite element method has shown that an electric field voltage of 100 V is capable of creating a quasi-isostatic mechanical stress in the region inside a cylindrical PZT tube of ∼3 MPa. Moreover, in the region of weak pressures up to 10 MPa, the contribution to the total adiabatic temperature change from piezo-mechanical compression linearly depends on the electrical voltage that can be used for control by magnetic and caloric properties of multicaloric materials.
Thermal physical properties of the La0.825Sr0.175MnO3 single crystals A. B. Batdalov, A. G. Gamzatov, A. M. Aliev, L. N. Khanov, A. A. Mukhuchev, Kh. E. Kamaludinova Physics of the Solid State, 2017 The heat capacity (C P), the thermal diffusion (η), the thermal conductivity (κ), and the electrical resistance of the La0.825Sr0.175MnO3 single crystal have been measured in the temperature range 80–350 K in magnetic fields to 40 kOe. Dependences C P(T), κ(T), and η(T) have anomalies near T C, which are suppressed in magnetic field. The minima in dependences κ(T) and η(T) near T C are explained by the phonon scattering on fluctuations of the magnetic order parameter. Dependences κ(T) and η(T) have anomalies near T S = 200 K related to the structural transition from the rhombohedral (R) to the orthorhombic (O*) phase.
Resistivity and magnetocaloric effect in manganites La0.75Ag0.125MnO2.85 and La0.7Ag0.15MnO2.80 A. G. Gamzatov, I. K. Kamilov, M. N. Markelova, A. A. Mukhuchev, A. Sh. Asvarov Low Temperature Physics, 2013 We studied structural and thermophysical properties of lanthanum-deficient manganites La0.75Ag0.125MnO2.85 and La0.7Ag0.15MnO2.80. In particular, we report the experimental results on electrical resistance, magnetoresistance, and magnetocaloric effect measured in the temperature range 80 K to 350 K. The magnetocaloric effect is measured using a direct method in a magnetic field of 20 kOe.
The resistivity and magnetocaloric effect in manganites La 0.75Ag0.125MnO2.85 and La0.7Ag 0.15MnO2.80 Fizika Nizkikh Temperatur, 2013
