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

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

2007-09-29

arxiv.org/abs/0710.1546v1

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 7 figures

Scientific paper

10.1103/PhysRevB.77.064403

We studied single-crystalline Pr0.5Sr0.5MnO3 by means of measurements of magnetic susceptibility and specific heat at ambient pressure (P), and electrical resistivity (r) in hydrostatic pressures up to 2 GPa. This material displays ferromagnetic (FM) order, with Curie temperature TC ~ 255 K. A crystallographic transformation from I4/mcm to Fmmm is accompanied by the onset of antiferromagnetism (AFM), with Neel temperature TN ~ 161 K. The effect of pressure is to lower TC, and raise TN at the approximate rates of -3.2 K/GPa, and 14.2 K/GPa, respectively. Although the value of TN 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 r vs T data suggest that the AFM phase should be completely suppressed near 2.4 GPa.

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