Substantial pressure effects on the electrical resistivity and ferromagnetic transition temperature of La{sub 1{minus}{ital x}}Ca{sub {ital x}}MnO{sub 3}
- Condensed Matter and Thermal Physics, MST-10, Mail Stop K764, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
The influence of hydrostatic pressure on the electrical resistivity {rho} and ferromagnetic transition temperature {ital T}{sub {ital c}} of La{sub 1{minus}{ital x}}Ca{sub {ital x}}MnO{sub 3} is presented for {ital x}=0.21, 0.33, and 0.40. Pressure strongly decreases {rho} and drives {ital T}{sub {ital c}} up at rates as large as +37 K/GPa for the {ital x}=0.21 specimen; this is significantly larger than {ital dT}{sub {ital c}}/{ital dP} values observed in conventional ferromagnets and about eight times larger than {ital dT}{sub {ital N}}/{ital dP} observed in Ca{sub 1{minus}{ital x}}Sr{sub {ital x}}MnO{sub 3} antiferromagnets. The transport mechanism in these oxides is influenced in a qualitatively similar way by both pressure and magnetic field. The results are interpreted in the framework of the double-exchange interaction involving conduction via magnetic polarons.
- OSTI ID:
- 115845
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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