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
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICA B
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0921-4526
Date:	June 1996
Volume:	224
Number:	1-4
Number of Pages:	3
Page Range:	pp. 532-534
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18576

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