Raman and dielectric spectroscopic analysis of magnetic phase transition in Y(Fe0.5Cr0.5)O3 multiferroic ceramics |
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| Affiliation: | 1. Department of Physics, Rajiv Gandhi Universities of Knowledge Technologies, RK Valley 516330, India;2. Department of Chemistry, Rajiv Gandhi Universities of Knowledge Technologies, RK Valley 516330, India;3. Advanced Magnetic Group, Defense Metallurgical Research Laboratory, Hyderabad 500058, India;4. Centre for Applied Physics, Central University of Jharkhand, Ranchi, Jharkhand 835205, India;1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;3. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China;4. Guangxi Key Laboratory of Superhard Materials, Guilin 541004, China;1. Department of Metallurgical and Materials Engineering, Rajiv Gandhi University of Knowledge Technologies, RK Valley, Kadapa 516330, Andhra Pradesh, India;2. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India;3. Department of Chemistry, Rajiv Gandhi University of Knowledge Technologies, RK Valley, Kadapa 516330, Andhra Pradesh, India;4. Department of Physics, Rajiv Gandhi University of Knowledge Technologies, RK Valley, Kadapa 516330, Andhra Pradesh, India;1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China;2. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, PR China;3. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, PR China;1. Department of Physics, University of Connecticut, Storrs, CT 06269, USA;2. Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA;3. Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA |
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| Abstract: | Here, we report the Raman and dielectric spectroscopic studies as a function of temperature of orthorhombically distorted Y(Fe0.5Cr0.5)O3 (YFC) ceramics, measured from 80 to 300 K. The dc-magnetization measurements under field cooled (FC)-zero field cooled (ZFC) protocol indicate a small onset of magnetic ordering at TN∼270 K. The field dependent magnetization plot recorded at 50 K, 150 K and 200 K show a clear opening in hysteresis loops. The linear dependence of magnetization plot at high field without any saturation of magnetization indicates the coexistence of weak ferromagnetic (WFM) component within the canting antiferromagnetic (CAFM) matrix. Temperature evolution of Raman line-shape parameter of B2g(4) phonon mode clearly exhibits an anomalous behavior of phonon shift near TN∼270 K, indicating the spin-phonon coupling in the ceramics. From the temperature dependent dielectric permittivity (ε(T)) study, two dielectric relaxation peaks are detected below 200 K and above 250 K. The appearance of former relaxation peak is responsible for polaronic conduction mechanism, while the later one is associated with magnetic phase transition which might be relevant to the presence of magnetoelectric coupling in YFC ceramics. The observed P-E hysteresis loops at room temperature indicate weak ferroelectric nature of the ceramics. |
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| Keywords: | Raman spectroscopy Dielectric spectroscopy Multiferroics Magnetic phase transition |
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