Pressure-induced changes in transport properties of layered La1.2Ca1.8Mn2O7
UNSPECIFIED. (1997) Pressure-induced changes in transport properties of layered La1.2Ca1.8Mn2O7. PHYSICAL REVIEW B, 56 (20). pp. 12688-12690. ISSN 1098-0121Full text not available from this repository.
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|
|Date:||15 November 1997|
|Number of Pages:||3|
|Page Range:||pp. 12688-12690|
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