Magnetic, structural, and spin dynamical properties of La{sub 1{minus}x}Ca{sub x}MnO{sub 3}
- Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
- Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
- Materials Engineering Program, University of Maryland, College Park, Maryland 20742 (United States)
- Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742 (United States)
Neutron scattering has been used to study the magnetic order, spin dynamics, and structural properties of La{sub 1{minus}x}Ca{sub x}MnO{sub 3} in the ferromagnetic regime (0{lt}x{lt}(1)/(2)). For x=(1)/(3)(T{sub C}=250 K) where the magnetoresistance effects are largest the system behaves as an ideal isotropic ferromagnet at low T, with a gapless ({lt}0.04 meV) dispersion relation E=Dq{sup 2} and D{sub T=0}{approx}155 meV{Angstrom}{sup 2}. However, an anomalous diffusive component develops above {approximately}200 K and dominates the fluctuation spectrum as T{r_arrow}T{sub C}. A magnetic field strongly reduces this quasielastic scattering, shifting the spectral weight into the spin wave component of the fluctuation spectrum. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496596
- Report Number(s):
- CONF-961141--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Correlation length in La{sub 1{minus}x}Ca{sub x}MnO{sub 3} (abstract)
High resolution ferromagnetic and antiferromagnetic correlations in La0.7Ca0.3MnO3