Phase Competition in Ln0.5a0.5mno3 Perovskites

Details Phase Competition in Ln0.5a0.5mno3 Perovskites Phase Competition in Ln0.5a0.5mno3 Perovskites

2002-09-16

arxiv.org/abs/cond-mat/0209370v1

Physics

Condensed Matter

Materials Science

10 pages. To be publised in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.174432

Single crystals of the systems Pr0.5(Ca1-xSrx)0.5MnO3, (Pr1-yYy)0.5(Ca1-xSrx)0.5MnO3, and Sm0.5Sr0.5MnO3 were grown to provide a series of samples with fixed ratio Mn(III)/Mn(IV)=1 having geometric tolerance factors that span the transition from localized to itinerant electronic behavior of the MnO3 array. A unique ferromagnetic phase appears at the critical tolerance factor tc= 0.975 that separates charge ordering and localized-electron behavior for ttc. This ferromagnetic phase, which has to be distinguished from the ferromagnetic metallic phase stabilized at tolerance factors t>tc, separates two distinguishable Type-CE antiferromagnetic phases that are metamagnetic. Measurements of the transport properties under hydrostatic pressure were carried out on a compositions t a little below tc in order to compare the effects of chemical vs. hydrostatic pressure on the phases that compete with one another near t=tc.

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