Phase Competition in Ln0.5a0.5mno3 Perovskites
arXiv:cond-mat/0209370 · doi:10.1103/PhysRevB.66.174432
Abstract
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 t<tc from itinerant or molecular-orbital behavior for t>tc. 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.
10 pages. To be publised in Phys. Rev. B
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Cited by in corpus (6)
- Magnetically induced electronic ferroelectricity in half-doped manganites
- Competing crystal structures in La0.5Ca0.5MnO3: conventional charge order versus Zener polarons
- Phase Diagram and Incommensurate Phases in Undoped Manganites
- Phase Diagram of Half Doped Manganites
- Spin Polaron Effective Magnetic Model for La_{0.5}Ca_{0.5}MnO_3
- Magnons in the half-doped manganites