An electron paramagnetic resonance study of phase segregation in Nd0.5Sr0.5MnO3 |
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| Institution: | 1. Department of Physics, Indian Institute of Science, Bangalore 560 012, India;2. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O. Bangalore 560 064, India;1. School of Materials Science and Engineering, University of Science and Technology of Beijing, Beijing 100083, PR China;2. ChuanDong Magnetic Electronic Co. Ltd., FoShan, GuangDong 528513, PR China;3. ChengXian Technology Co. Ltd., FoShan, GuangDong 528513, PR China;4. Department of Physics, Capital Normal University, Beijing 100048, PR China;1. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036 Russia;2. Siberian Federal University, Krasnoyarsk 660041 Russia;1. Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax, B.P. 802, Sfax 3018, Tunisia;2. Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble cedex 9, France;1. Laboratoire de la Matière Condensée et des Nanosciences, Département de Physique, Faculté des Sciences de Monastir, Monastir 5019, Tunisie;2. Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de sfax B.P.802, Sfax 3018, Tunisie;3. Laboratoire de Science et Génie des Matériaux, Faculté de Génie Mécanique et Génie des Procédés, Université des Sciences et de la Technologie Houari Boumediene BP32 El Alia, Bab Ezzouar 16111, Alger, Algérie;4. Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble cedex 9, France;1. Postgraduate Studies in Biotechnology and Biodiversity, Federal University of Acre, Rio Branco, Acre, Brazil;2. Department of Physical Chemistry, Institute of Chemistry, Universidade Estadual Paulista, Araraquara, São Paulo, Brazil;3. Universidade de Brasília, Instituto de Ciências Biológicas, Brasília DF 70910-900, Brazil;4. Universidade de Brasília, Instituto de Física, Brasília DF 70910-900, Brazil;5. Anhui University, School of Chemistry and Chemical Engineering, Hefei 230601, China |
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| Abstract: | We present results of an electron paramagnetic resonance (EPR) study of Nd1?xSrxMnO3 with x=0.5 across the paramagnetic to ferromagnetic, insulator to metal transition at 260 K (Tc) and the antiferromagnetic, charge ordering transition (TN=Tco) at 150 K. The results are compared with those on Nd0.45Sr0.55MnO3 which undergoes a transition to a homogeneous A-type antiferromagnetic phase at TN=230 K and on La0.77Ca0.23MnO3 which undergoes a transition to coexisting ferromagnetic metallic and ferromagnetic insulating phases. For x=0.5, the EPR signals below Tc consist of two Lorentzian components attributable to the coexistence of two phases. From the analysis of the temperature dependence of the resonant fields and intensities, we conclude that in the mixed phase ferromagnetic and A-type antiferromagnetic (AFM) phases coexist. The x=0.55 compound shows a single Lorentzian throughout the temperature range. The signal persists for a few degrees below TN. The behaviour of the A-type AFM phase is contrasted with that of the two ferromagnetic phases present in La0.77Ca0.23MnO3. The comparison of behaviour of A-type AFM signal observed in both Nd0.5Sr0.5MnO3 and Nd0.45Sr0.55MnO3 with the two FM phases of La0.77Ca0.23MnO3, vis-à-vis the shift of resonances with respect to the paramagnetic phases and the behaviour of EPR intensity as a function of temperature conclusively prove that the Nd0.5Sr0.5MnO3 undergoes phase separation into A-type AFM and FM phases. |
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