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