Enhanced ferromagnetism and glassy state in phase separated La0.95Sr0.05MnO3+delta
authors De, K; Das, S; Roy, A; Dhak, P; Willinger, M; Amaral, JS; Amaral, VS; Giri, S; Majumder, S; Silva, CJR; Gomes, MJM; Mahapatra, PK
nationality International
journal JOURNAL OF APPLIED PHYSICS
keywords SPIN-GLASSES; LA1-XSRXMNO3; TRANSITION; MAGNETORESISTANCE; ANISOTROPY; TRANSPORT; MAGNETISM; BEHAVIOR; DIAGRAM; OXIDES
abstract Unusual high temperature ferromagentism is reported for La0.95Sr0.05MnO3 + delta with Curie temperatures (T-C1 and T-C2) T-C1 at 290K and T-C2 similar to 150 K. Weak antiferromagnetism (AFM) is thought to give low moment, low temperature irreversibility, and non-saturation up to 10 T at 5 K. A short-range ferromagnetism is predicted from well-defined hysteresis at 5K and field-cooled (FC) magnetization curves. Strong irreversibility between zero field-cooled (ZFC) and FC at 5 T is due to "hard" spins, not from ferromagnetic clusters. Field-dependent peak shift of spin freezing temperature in ZFC, memory effect, magnetic relaxation shows cluster glass like transition in the system. A metal-insulator transition at 115 K also implies a completion of percolation of short range ferromagnetic clusters, giving an onset of metallic state at 115 K. A complete magnetic phase diagram is presented showing its temperature dependent rich magnetic behavior. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4763460]
publisher AMER INST PHYSICS
issn 0021-8979
year published 2012
volume 112
issue 10
digital object identifier (doi) 10.1063/1.4763460
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000311969800082
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journal impact factor 2.176
5 year journal impact factor 2.163
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