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Field induced insulator-metal transition in Pr1-xCaxMnO3
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UNSPECIFIED (1996) Field induced insulator-metal transition in Pr1-xCaxMnO3. PHYSICA B, 224 (1-4). pp. 532-534. ISSN 0921-4526.
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Abstract
We present a detailed study of the properties of Pr1-xCaxMnO3 which shows that for a range of compositions (0.3 less than or equal to x < 0.5) there is a first-order magnetic field induced insulator-metal transition. In zero field the resistivity rho of this material shows an activated behaviour and rho exceeds 10(8) Omega cm below 50 K. At 4 K, application of magnetic fields of up to 80 kOe, allows rho to be reduced by at least 8 orders of magnitude depending on the value of the applied field. For the x = 0.4 composition the magnetic and charge ordering (CO) effects observed in this material are decoupled. The antiferromagnetic (AFM) ordering at T-N = 170 K develops at considerably lower temperatures than the CO state which is observed at T-CO = 250 K. Below T-CO, application of a magnetic field produces metamagnetic transitions. The field transforms the magnetic correlations from either paramagnetic or AFM to ferromagnetic (FM). At temperatures below 25 K the magnetic field produces irreversible changes in the magnetic order of this material. This in turn leads to the formation of long lived conducting states in zero field.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICA B | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0921-4526 | ||||
Official Date: | June 1996 | ||||
Dates: |
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Volume: | 224 | ||||
Number: | 1-4 | ||||
Number of Pages: | 3 | ||||
Page Range: | pp. 532-534 | ||||
Publication Status: | Published |
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