Radiation damage effects on transport and colossal magnetoresistance in La{sub (1{minus}x)}Ca{sub x}MnO{sub 3}
The effects of crystal lattice disorder induced by irradiation of La-Ca-Mn-O films are reviewed. These experiments provide insight into the anomalous transport properties and colossal magnetoresistance (CMR) of these perovskites. Electron irradiation produces only slight lattice damage, about 10{sup {minus}5} displacements per atom (dpa) which would be imperceptible in an ordinary bad metal or activated semiconductor but gives large changes in resistance that illustrate the exotic nature of transport in both the metallic and insulating phases of the CMR films. Ion irradiation produces damage ranging from 5 x 10{sup {minus}3} dpa to 2.4 x 10{sup {minus}2} dpa which provides a systematic picture of CMR and transport from relatively small lattice disorder to more severe disorder, sufficient to completely suppress the metal-insulator (M-I) transition.
- Research Organization:
- Texas A and M Univ., College Station, TX (US)
- OSTI ID:
- 20015179
- Journal Information:
- International Journal of Modern Physics B, Vol. 13, Issue 29-31; Conference: Second International Conference of New Theories, Discoveries and Applications of Superconductors and Related Materials (New{sup 3}SC-2), Las Vegas, NV (US), 06/01/1999; Other Information: PBD: 20 Dec 1999; ISSN 0217-9792
- Country of Publication:
- United States
- Language:
- English
Similar Records
Relation between giant volume magnetostriction, colossal magnetoresistance, and crystal lattice softening in manganites La{sub 1-x}A{sub y}MnO{sub 3} (A = Ca, Ag, Ba, Sr)
The effect of radiation induced disorder on La{sub 0.7}Ca{sub 0.3}MnO{sub 3{minus}{delta}} thin films