Dirty Peierls transition to stripe phase in manganites

2006/10/10 by S. Cox, Cox, S., J. C. Lashley +9
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/0610276

arxiv created 2006/10/10 · arxiv updated 2009/12/01

Abstract

The nature of the phase transitions in La_1-xCa_xMnO₃ and Pr_0.48Ca_0.52MnO₃ has been probed using heat capacity and magnetisation measurements. The phase transition associated with the onset of the stripe phase has been identified as second order. The model of a Peierls transition in a disordered system (a `dirty' Peierls transition) is shown to provide an extremely good fit to this transition. In addition, an unexpected magnetic phase has been revealed in low temperature Pr_0.48Ca_0.52MnO₃, associated with an excess heat capacity over a wide temperature range compared to La_1-xCa_xMnO₃.

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