Pressure effects on charge, spin, and metal-insulator transitions in the narrow bandwidth manganite Pr1-xCaxMnO3

Congwu Cui, Trevor A. Tyson

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66 Scopus citations

Abstract

Pressure effects on the charge and spin states and the relation between the ferromagnetic and metallic states were explored on the small bandwidth manganite Pr1-xCaxMnO3 (x=0.25, 0.3, 0.35). Under pressure, the charge ordering state is suppressed and a ferromagnetic metallic state is induced in all three samples. The metal-insulator transition temperature (TMI) increases with pressure below a critical point P*, above which (TMI) decreases and the material becomes insulating as at the ambient pressure. The eg electron bandwidth and/or band filling mediate the pressure effects on the metal-insulator transition and the magnetic transition. In the small bandwidth and low doping concentration compound (x=0.25), the TMI and the Curie temperature (TC) change with pressure in a reverse way and do not couple under pressure. In the x=0.3 compound, the relation of TMI and T C shows a critical behavior: They are coupled in the range of ∼0.8-5 GPa and decoupled-outside of this range. In the x=0.35 compound, TMI and TC are coupled in the measured pressure range where a ferromagnetic state is present.

Original languageEnglish (US)
Article number094409
Pages (from-to)094409-1-094409-8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number9
DOIs
StatePublished - Sep 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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