Electron Paramagnetic Resonance Study of Phase Segregation in\n Nd_0.5Sr_0.5MnO₃

2002/01/18 by Janhavi P. Joshi, A. K. Sood, Anil K. Sood +8
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Magnetic properties of thin films #Solid-state spectroscopy and crystallography #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/0201336

openalex publication_date 2002/01/18 · arxiv created 2003/11/11 · arxiv updated 2009/11/30 · openalex created_date 2025/10/27 · openalex updated_date 2026/07/28

Abstract

We present results of an electron paramagnetic resonance (EPR) study of\nNd_1-xSr_xMnO₃ with x = 0.5 across the paramagnetic to ferromagnetic,\ninsulator to metal transition at 260 K (T_c) and the antiferromagnetic,\ncharge ordering transition (T_N = T_co) at 150 K. The results are\ncompared with those on Nd_0.45Sr_0.55MnO₃ which undergoes a\ntransition to a homogeneous A-type antiferromagnetic phase at T_N = 230 K and\non La_0.77Ca_0.23MnO₃ which undergoes a transition to coexisting\nferromagnetic metallic and ferromagnetic insulating phases. For x = 0.5, the\nEPR signals below T_c consist of two Lorentzian components attributable to\nthe coexistence of two phases. From the analysis of the temperature dependence\nof the resonant fields and intensities, we conclude that in the mixed phase\nferromagnetic and A-type antiferromagnetic (AFM) phases coexist. The x = 0.55\ncompound shows a single Lorentzian throughout the temperature range. The signal\npersists for a few degrees below T_N. The behaviour of the A-type AFM phase is\ncontrasted with that of the two ferromagnetic phases present in\nLa_0.77Ca_0.23MnO₃. The comparison of behaviour of A-type AFM signal\nobserved in both Nd_0.5Sr_0.5MnO₃and\nNd_0.45Sr_0.55MnO₃with the two FM phases of\nLa_0.77Ca_0.23MnO₃, vis-a-vis the shift of resonances with respect\nto the paramagnetic phases and the behaviour of EPR intensity as a function of\ntemperature conclusively prove that the Nd_0.5Sr_0.5MnO₃undergoes\nphase separation into A-type AFM and FM phases.\n

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