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

Abstract

Magnetic and thermodynamic properties of polycrystalline multiferroic Bi 0.65 La 0.35 Fe 0.5 Sc 0.5 O 3 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 T N ~237 K. Magnetic hysteresis loops taken below T N show a huge coercive field up to H c ~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 T D =189 K have been determined.

Publication DOI: https://doi.org/10.1016/j.jmmm.2017.01.037
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Aston Institute of Photonics Technology
Additional Information: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: Heat capacity,Magnetization,Multiferroic perovskites,Electronic, Optical and Magnetic Materials,Condensed Matter Physics
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.sci ... 5689?via%3Dihub (Publisher URL)
PURE Output Type: Article
Published Date: 2017-05-01
Published Online Date: 2017-01-12
Accepted Date: 2017-01-11
Authors: Fertman, E. L.
Fedorchenko, A. V.
Khalyavin, D. D.
Salak, A. N.
Baran, A.
Desnenko, V. A.
Kotlyar, O. V. (ORCID Profile 0000-0002-2744-0132)
Čižmár, E.
Feher, A.
Syrkin, E. S.
Vaisburd, A. I.
Olekhnovich, N. M.
Pushkarev, A. V.
Radyush, Yu V.
Stanulis, A.
Kareiva, A.

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