On the Magnetic Ground State of La0.85Sr0.15CoO3 Single Crystals

Autor:	D. Samal, Kaustuv Manna, P. S. Anil Kumar, H. L. Bhat, Suja Elizabeth
Rok vydání:	2011
Předmět:	Condensed Matter::Materials Science Float zone General Energy Materials science Condensed matter physics Physics Condensed Matter::Strongly Correlated Electrons Physical and Theoretical Chemistry Ground state Surfaces Coatings and Films Electronic Optical and Magnetic Materials
Zdroj:	The Journal of Physical Chemistry C. 115:13985-13990
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp201206a
Popis:	We present an extensive study on magnetic and transport properties of La(0.85)Sr(0.15)CoO(3) single crystals grown by a float zone method to address the issue of phase separation versus spin-glass (SG) behavior. The dc magnetization study reveals a kink in field-cooled magnetization, and the peak in the zero-field-cooling curve shifts to lower temperature at modest dc fields, indicating the SG magnetic phase. The ac susceptibility study exhibits a considerable frequency-dependent peak shift (similar to 4 K) and a time-dependent memory effect below the freezing temperature. In addition, the characteristic time scale tau(0) estimated from the frequency-dependent ac susceptibility measurement is found to be similar to 10(-13) s, which matches well with typical values observed in canonical SG systems. The transport relaxation study evidently demonstrates the time-dependent glassy phenomena. In essence, all our experimental results corroborate the existence of SG behavior in La(0.85)Sr(0.15)CoO(3) single crystals.
Databáze:	OpenAIRE
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