High-pressure resistivity and X-ray diffraction measurements were conducted on La0.85MnO3-δ at ∼6 and ∼7 GPa, respectively. At low pressures the metalinsulator transition temperature (T MI) increases linearly up to a critical pressure, P (*) ∼3.4 GPa, followed by reduction in TMI at higher pressure. Analysis of the bond distances and bond angles reveals that a bandwidth increase drives the increase in TMI below P (*). The reduction in TMI at higher pressures is found to result from JahnTeller distortions of the MnO6 octahedra. The role of anharmonic interatomic potentials is discussed.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- High pressure
- Metalinsulator transition
- Perovskite manganite