Hydrostatic pressure effects on the electrical transport properties of Pr(0.5)Sr(0.5)MnO(3)

作者：Rueckert F J^*; Steiger M; Davis B K; Huynh T; Neumeier J J; Torikachvili M S

来源：Physical Review B, 2008, 77(6): 064403.

DOI：10.1103/PhysRevB.77.064403

We studied single-crystalline Pr(0.5)Sr(0.5)MnO(3) 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.

• 出版日期2008-2