The influence of hydrostatic pressure on the temperature dependence of the resistivity in
1997; Elsevier BV; Volume: 229; Issue: 2 Linguagem: Inglês
10.1016/s0921-4526(96)00511-x
ISSN1873-2135
AutoresI. V. Medvedeva, Yu. S. Bersenev, K. Bärner, L. Haupt, R.K. Mandal, A. Poddar,
Tópico(s)High-pressure geophysics and materials
ResumoThe temperature dependence of the resistivity of Nd23Sr13MnO3−δ was studied under hydrostatic pressure up to 15 kbar. Two magnetic phase transition temperatures, T1 and T2 are identified, they both increase under pressure with nearly the same rate dT1, 2dP = 2.4 K/kbar. It is conccluded that T1 increases under pressure because the electron overlap integral increases and with it the double-exchange transfer integra, while a substitution with large RE elements (“negative chemical pressure”) should decrease the transfer but could still increase T1 by increasing the Zener carrier density.
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