Magnetism

Critical behavior of the heat capacity of the manganite La$_{0.87}$K$_{0.13}$MnO$_3$

A.G. Gamzatov^a, A. M. Aliev^a, K. Sh. Khizriev^a, I. K. Kamilov^a, A. S. Mankevich^b, I. E. Korsakov<sup>b

a</sup> Daghestan Institute of Physics after Amirkhanov
^b Lomonosov Moscow State University

Abstract: The heat capacity of the manganite La$_{0.87}$K$_{0.13}$MnO$_3$ has been measured in the temperature range 80–350 K. The nature of the ferromagnetic phase transition and the critical properties of heat capacity near the Curie temperature have been studied. The regularities of variations in the universal critical parameters near the phase transition point have been established. The calculated critical exponent and amplitudes of the heat capacity with allowance for corrections on the scaling ($\alpha$ = -0.13 and $A^+/A^-$ = 1.178) correspond to the critical behavior of the 3$D$ Heizenberg model.

Received: 13.04.2011

 English version: Physics of the Solid State, 2011, 53:11, 2271–2274

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