Abstract
We have measured the resistivity and magnetoresistance of single-crystal Nd0.62Pb0.30MnO3-δ as a function of hydrostatic pressure up to 12 kbar. The pressure dependence of the resistivity at temperatures near the metal-insulator transition exceeds d(Inρ)/dP ∼ 3 kbar-1, greater than that observed in the normal state of high-temperature superconductors. The extreme pressure sensitivity of the resistivity below the transition temperature provides evidence that the low-temperature phase is not a simple metal. The metal-insulator transition temperature TM1 decreases by 2.6 K kbar-1, in accord with an expectation for greater pressure sensitivity in lower-doped materials with lower TM1 . The peak magnetoresistance defined as [ρ(0 T) - ρ(7 T)]/ρ(7 T) decreases with increasing pressure as the metal-insulator transition becomes less abrupt. The influence of thermal expansion upon the resistivity is expected to be large.
Original language | English (US) |
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Pages (from-to) | 7723-7731 |
Number of pages | 9 |
Journal | Journal of Physics Condensed Matter |
Volume | 8 |
Issue number | 41 |
DOIs | |
State | Published - Oct 7 1996 |
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics