Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-11-28
Solid State Communications 151 (2011) 1340-1343
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
The magnetic entropy change (\DeltaS), a measure of the magnetocaloric effect, in Tb5Si3, a compound exhibiting unusual positive magnetoresistance following a magnetic-field-induced transition below magnetic transition temperature (~ 69 K), has been investigated. We found that \DeltaS is negative in the paramagnetic state. At the magnetic transition temperature, \DeltaS shows sign reversal from negative (in the paramagnetic state) to positive value in the magnetically ordered state. The high-field state which is interestingly the high resistive state is found to be associated with higher entropy i.e. large positive \DeltaS, behaving like a paramagnet. On the basis of this observation, we conclude that the magnetic field induces magnetic fluctuations in the system resulting in positive magnetoresistance, thereby rendering support to the idea of 'inverse metamagnetism' in this compound. In addition, we note that Arrott plots present an interesting scenario.
Das Sitikantha D.
Mohapatraa Niharika
Mukherjee Kaustav
Sampathkumaran E. V.
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