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Time evolution of resistance in response to magnetic field: Evidence of glassy transport in La 0.85 Sr 0.15 CoO 3
Author(s) -
Samal D.,
Kundu R.,
Dalai M. K.,
Sekhar B. R.,
Kumar P. S. Anil
Publication year - 2012
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201147551
Subject(s) - annealing (glass) , materials science , spin glass , condensed matter physics , phase (matter) , exponential function , analytical chemistry (journal) , magnetic field , spectroscopy , nuclear magnetic resonance , chemistry , physics , composite material , mathematical analysis , mathematics , organic chemistry , chromatography , quantum mechanics
Abstract We demonstrate the distinct glassy transport phenomena associated with the phase separated and spin‐glass‐like phases of La 0.85 Sr 0.15 CoO 3 , prepared under different heat‐treatment conditions. The low‐temperature annealed (phase‐separated) sample, exhibits a small change in resistance, with evolution of time, as compared to the high‐temperature annealed (spin glass) one. However, the resistance change as a function of time, in both cases, is well described by a stretched exponential fit, signifying the slow dynamics. Moreover, the ultraviolet spectroscopy study evidences a relatively higher density of states in the vicinity of E F for low‐temperature annealed sample and this correctly points to its less semiconducting behavior.