UNSPECIFIED (1997) Pressure-induced changes in transport properties of layered La1.2Ca1.8Mn2O7. PHYSICAL REVIEW B, 56 (20). pp. 12688-12690. ISSN 1098-0121

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Abstract

The transport properties of a single crystal of La1.2Ca1.8Mn2O7 with the layered Sr3Ti2O7-type perovskite structure have been studied under hydrostatic pressures of up to similar to 9 kbar. It is found that La1.2Ca1.8Mn2O7 undergoes a first-order phase transition from a paramagnetic insulating to a low-temperature ferromagnetic metallic state which is accompanied by a large decrease in the electrical resistivity. At ambient pressure the magnetic phase transition takes place at T-c=242 K and as the external pressure is applied the critical temperature increases Linearly at a rate of 1.1 K/kbar. The present results reflect the competition between double and superexchange resulting from two-dimensional Mn-O-Mn networks and can be interpreted in terms of the exchange striction model.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICAL REVIEW B
Publisher:	AMERICAN PHYSICAL SOC
ISSN:	1098-0121
Date:	15 November 1997
Volume:	56
Number:	20
Number of Pages:	3
Page Range:	pp. 12688-12690
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/16212

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