Pressure dependence of the resistivity and magnetoresistance in single-crystal Nd0.62Pb0.30MnO3-δ

K. Khazeni, Y. X. Jia, Vincent H. Crespi, L. Lu, A. Zettl, Marvin L. Cohen

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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 languageEnglish (US)
Pages (from-to)7723-7731
Number of pages9
JournalJournal of Physics Condensed Matter
Issue number41
StatePublished - Oct 7 1996

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics


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