Pressure dependence of the resistivity and magnetoresistance in single-crystal
K Khazeni; Y X Jia; Vincent H Crespi; L Lu; A Zettl; Marvin L Cohen; K Khazeni; Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Y X Jia; Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Vincent H Crespi; Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; L Lu; Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; A Zettl; Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Marvin L Cohen; Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
Журнал:
Journal of Physics: Condensed Matter
Дата:
1996-10-07
Аннотация:
We have measured the resistivity and magnetoresistance of single-crystal as a function of hydrostatic pressure up to 12 kbar. The pressure dependence of the resistivity at temperatures near the metal - insulator transition exceeds , 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 decreases by , in accord with an expectation for greater pressure sensitivity in lower-doped materials with lower . The peak magnetoresistance defined as 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.
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