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JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2001 Volume 73, Issue 7, Pages 392–395 (Mi jetpl4356)

This article is cited in 7 papers

CONDENSED MATTER

Phase transition in electronic manganite Ca$_{0.85}$Sm$_{0.15}$MnO$_3$

A. N. Vasilieva, T. N. Voloshoka, R. Suryanarayananb

a M. V. Lomonosov Moscow State University
b Université Paris-Sud, Orsay cedex

Abstract: The resistivity, the magnetic susceptibility, the magnetization, and the specific heat of electronic manganite Ca$_{0.85}$Sm$_{0.15}$MnO$_3$ were studied. The data obtained suggest that this compound undergoes phase transition into the insulator antiferromagnetic state at $T_c\sim115\,$ K and displays negative magnetoresistance at $T<T_c$. A minor ferromagnetic component of $0.025\mu_B$ in the magnetization of Ca$_{0.85}$Sm$_{0.15}$MnO$_3$ may be caused by the deviation of this composition from the exact stoichiometry Mn$^{3+}:{}$Mn$^{4+}=1:8$. The Debye temperature $\Theta_D=575\,$ K and the entropy of phase transition $\Delta S=5.1\,$ J/(mol K) were derived from the temperature dependence of specific heat.

PACS: 75.30.Vn, 75.40.Cx

Received: 26.02.2001


 English version:
Journal of Experimental and Theoretical Physics Letters, 2001, 73:7, 349–351

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