Magnetotransport and hysteretic behavior in epitaxial La{sub 0.67}Ca{sub 0.33}MnO{sub 3{minus}{delta}} films

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.361719· OSTI ID:279991

Canedy, C L; Ibsen, K B; Xiao, G ^[1]; Sun, J Z; Gupta, A; Gallagher, W J ^[2]

---

1. Department of Physics, Brown University, Providence, Rhode Island 02912 (United States)
2. IBM Research Division, Yorktown Heights, New York 10598 (United States)

We have fabricated epitaxial La{sub 0.67}Ca{sub 0.33}MnO{sub 3{minus}{delta}} thin films using pulsed laser deposition and performed subsequent thermal treatments. Magnetoresistance values as large as 14000{percent} ({Delta}{rho}/{rho}{sub {ital H}}) were obtained. Above magnetic ordering temperatures, we observed a thermally activated conductivity that also has a quadratic magnetic field dependence. At low temperatures, we found a large hysteresis in the magnetoresistance that correlates with an unusual magnetic hysteresis curve. We interpret the hysteretic behavior as the result of a {open_quote}{open_quote}frozen-in{close_quote}{close_quote} canted spin structure. Our results suggest that the electron conduction in this material is most sensitive to the canting angle of the neighboring Mn spins. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 279991
• Report Number(s): CONF-951101--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
EPITAXY
HEAT TREATMENTS
HYSTERESIS
LANTHANUM OXIDES
MAGNETIC MATERIALS
MAGNETIC STRUCTURE
MAGNETIZATION
MAGNETORESISTANCE
MANGANESE OXIDES
TEMPERATURE DEPENDENCE
THIN FILMS