2003/11/30 by Congwu Cui, Trevor A. Tyson · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Electronic and Structural Properties of Oxides #Magnetic and transport properties of perovskites and related materials #cond-mat
paper · pdf · doi:10.1103/physrevb.70.094409
published as Phys. Rev. B 70, 094409 (2004)
arxiv created 2003/12/03 · openalex publication_date 2004/09/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Pressure effects on the charge and spin states and the relation between the ferromagnetic and metallic states were explored on the small bandwidth manganite Pr_1\ensuremath-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 TC shows a critical behavior: They are coupled in the range of \ensuremath∼0.8--5\phantom\rule0.3em0exGPa and decoupledoutside 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.