Pressure-induced changes in transport properties of layered La1.2Ca1.8Mn2O7

K V Kamenev, M R Lees, G Balakrishnan, D M Paul

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)12688-12690
Number of pages3
JournalPhysical Review B
Volume56
Issue number20
Publication statusPublished - 15 Nov 1997

Keywords

  • LOW-TEMPERATURE MAGNETORESISTANCE
  • GIANT MAGNETORESISTANCE
  • MANGANESE OXIDES
  • MANGANATES

Fingerprint

Dive into the research topics of 'Pressure-induced changes in transport properties of layered La<sub>1.2</sub>Ca<sub>1.8</sub>Mn<sub>2</sub>O<sub>7</sub>'. Together they form a unique fingerprint.

Cite this