Hydrostatic pressure effects on the electrical transport properties of Pr0.5Sr0.5MnO3

被引:11
作者
Rueckert, F. J. [1 ]
Steiger, M. [1 ]
Davis, B. K. [1 ,2 ]
Huynh, T. [3 ]
Neumeier, J. J. [3 ]
Torikachvili, M. S. [1 ]
机构
[1] San Diego State Univ, Dept Phys, San Diego, CA 92182 USA
[2] Quantum Design, San Diego, CA 92121 USA
[3] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevB.77.064403
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We studied single-crystalline Pr0.5Sr0.5MnO3 by means of measurements of magnetic susceptibility and specific heat at ambient pressure (P) and electrical resistivity (rho) in hydrostatic pressures up to 2 GPa. This material displays ferromagnetic (FM) order, with Curie temperature T-C approximate to 255 K. A crystallographic transformation from I4/mcm to Fmmm is accompanied by the onset of antiferromagnetism (AFM), with Neel temperature T-N approximate to 161 K. The effect of pressure is to lower T-C and to raise T-N at the approximate rates of -3.2, and 14.2 K/GPa, respectively. Although the value of T-N increases with P, due to the enhancement of the superexchange interactions, the AFM-Fmmm state is progressively suppressed, as pressure stabilizes the FM-I4/mcm phase to lower temperatures. The rho vs T data suggest that the AFM phase should be completely suppressed near 2.4 GPa.
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页数:6
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