Giant magnetoresistance in La{sub 0.6}Pb{sub 0.4}Mn{sub 1{minus}x}Ti{sub x}O{sub 3} films: Enhancement of magnetoresistance due to Ti{sup 4+} substitution in Mn{sup 4+} sites
- Indian Inst. of Science, Bangalore (India)
Nonmagnetic Ti{sup 4+} ion is substituted for Mn{sup 4+} in La{sub 0.6}Pb{sub 0.4}MnO{sub 3}. The resulting La{sub 0.6}Pb{sub 0.4}Mn{sub (1{minus}x)}Ti{sub x}O{sub 3} (0 {le} x {le} 0.3) crystallizes in rhombohedral structure. The insulator-to-metal transition temperature decreases from 320 K to 92 K as x is varied from 0 to 0.09. Epitaxial films for the compositions x = 0, 0.03, 0.05, and 0.07 are fabricated by pulsed-laser deposition. Magnetoresistance at 6 T is enhanced from 38% for x = 0 to 75% for x = 0.07. The presence of Ti{sup 4+} (d{sup 0}) ion decreases the Mn-Mn interaction through oxygen and thereby affects the resistivity and magnetoresistance of La{sub 0.6}Pb{sub 0.4}MnO{sub 3}.
- OSTI ID:
- 514721
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 7 Vol. 32; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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