Multiferroic Bi 0.65 La 0.35 Fe 0.5 Sc 0.5 O 3 perovskite: magnetic and thermodynamic properties

Magnetic and thermodynamic properties of polycrystalline multiferroic Bi0.65La0.35Fe0.5Sc0.5O3 synthesized under high-pressure and high-temperature conditions are reported. Magnetic properties were studied using a SQUID magnetometer technique over the temperature range of 5−300 K in magnetic fields...

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Bibliographic Details
Main Author: Fertman, E.L. (author)
Other Authors: Fedorchenko, A. V. (author), Khalyavin, D. D. (author), Salak, A. N. (author), Baran, A. (author), Desnenko, V. A. (author), Kotlyar, O. V. (author), Čižmár, E. (author), Feher, A. (author), Syrkin, E. S. (author), Vaisburd, A. I. (author), Olekhnovich, N. M. (author), Pushkarev, A. V. (author), Radyush, Yu. V. (author), Stanulis, A. (author), Kareiva, A. (author)
Format: article
Language:eng
Published: 2019
Subjects:
Multiferroic perovskites
Magnetization
Heat capacity
Online Access:http://hdl.handle.net/10773/25402
Country:Portugal
Oai:oai:ria.ua.pt:10773/25402
Description
Summary:Magnetic and thermodynamic properties of polycrystalline multiferroic Bi0.65La0.35Fe0.5Sc0.5O3 synthesized under high-pressure and high-temperature conditions are reported. Magnetic properties were studied using a SQUID magnetometer technique over the temperature range of 5−300 K in magnetic fields up to H=10 kOe. The field dependent magnetization M(H) was measured in magnetic fields up to 50 kOe at different temperatures up to 230 K after zero-field cooling procedure. A long-range magnetic ordering of the AFM type with a weak FM contribution occurs below the Néel temperature TN ~237 K. Magnetic hysteresis loops taken below TN show a huge coercive field up to Hc ~10 kOe. A strong effect of magnetic field on the magnetic properties of the compound has been found. Derivative of the initial magnetization curves demonstrates a temperature-dependent anomaly in fields of H=15−25 kOe. Besides, an anomaly of the temperature dependent zero-field cooled magnetization measured in magnetic fields of 6−7 kOe has been found. Origin of both anomalies is associated with inhomogeneous magnetic state of the compound. The heat capacity has been measured from 2 K up to room temperature and a significant contribution from the magnon excitations at low temperatures has been detected. From the low-temperature heat capacity, an anisotropy gap of the magnon modes of the order 3.7 meV and Debye temperature TD=189 K have been determined.

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