Excess specific heat and evidence of zero-point entropy in magnetic glassy state of half-doped manganites

Banerjee, A. ; Rawat, R. ; Mukherjee, K. ; Chaddah, P. (2009) Excess specific heat and evidence of zero-point entropy in magnetic glassy state of half-doped manganites Physical Review B: Condensed Matter and Materials Physics, 79 (21). 212403_1-212403_4. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v79/i21/e212403

Related URL: http://dx.doi.org/10.1103/PhysRevB.79.212403

Abstract

We show that specific heat Cp has non-Debye behavior for glassy states in half-doped manganites. Irrespective of the magnetic order or electronic states, these magnetic glasses have higher Cp compared to their equilibrium counterparts. The excess Cp contributed by the glassy state varies linearly with temperature similar to conventional glasses indicating tunneling in the two-level systems. These glassy states show signature of zero-point entropy. Magnetic glasses can be produced simply by different field cooling protocols and may be considered ideal magnetic counterpart of the conventional glass.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:84453
Deposited On:27 Feb 2012 13:14
Last Modified:19 May 2016 00:53

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