Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La{sub 1-x}Ca{sub x}MnO{sub 3} (x=0.25,0.30)
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom)
- Correlated Electron Research Center (CERC), Tsukuba 305-0046 (Japan)
Using time-of-flight and triple-axis inelastic neutron spectroscopy, we determine spin-wave excitations throughout the Brillouin zone for ferromagnetic manganites La{sub 1-x}Ca{sub x}MnO{sub 3} (x=0.25,0.3) in their low-temperature metallic states. While spin-wave excitations in the long-wavelength limit (spin stiffness D) have similar values for both compounds, the excitations near the Brillouin-zone boundary of La{sub 0.7}Ca{sub 0.3}MnO{sub 3} are considerably softened in all symmetry directions compared to that of La{sub 0.75}Ca{sub 0.25}MnO{sub 3}. A Heisenberg model with the nearest neighbor and the fourth neighbor exchange interactions can describe the overall dispersion curves fairly well. We compare the data with various theoretical models describing the spin excitations of ferromagnetic manganites.
- OSTI ID:
- 20957803
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 75; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Spin waves throughout the Brillouin zone and magnetic exchange coupling in ferromagnetic metallic manganites La$_{1-x}$Ca$_{x}$MnO$_3$ ($x=0.25,0.30$)
Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La1−xCaxMnO3 (x=0.25, 0.30)
Magnetic Coupling in the Insulating and Metallic Ferromagnetic La1-xCaxMnO3
Journal Article
·
Sun Dec 31 23:00:00 EST 2006
· Physical Review B
·
OSTI ID:936815
Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La1−xCaxMnO3 (x=0.25, 0.30)
Journal Article
·
Sun Dec 31 23:00:00 EST 2006
· Physical Review B
·
OSTI ID:931582
Magnetic Coupling in the Insulating and Metallic Ferromagnetic La1-xCaxMnO3
Journal Article
·
Sun Dec 31 23:00:00 EST 2000
· Physical Review, B: Condensed Matter
·
OSTI ID:829285
Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BRILLOUIN ZONES
CALCIUM COMPOUNDS
COMPARATIVE EVALUATIONS
ELECTRONS
EXCHANGE INTERACTIONS
EXCITATION
FERROMAGNETIC MATERIALS
FLEXIBILITY
HEISENBERG MODEL
LANTHANUM COMPOUNDS
NEUTRON SPECTRA
NEUTRON SPECTROSCOPY
SPIN
SPIN WAVES
TEMPERATURE RANGE 0065-0273 K
TIME-OF-FLIGHT METHOD
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BRILLOUIN ZONES
CALCIUM COMPOUNDS
COMPARATIVE EVALUATIONS
ELECTRONS
EXCHANGE INTERACTIONS
EXCITATION
FERROMAGNETIC MATERIALS
FLEXIBILITY
HEISENBERG MODEL
LANTHANUM COMPOUNDS
NEUTRON SPECTRA
NEUTRON SPECTROSCOPY
SPIN
SPIN WAVES
TEMPERATURE RANGE 0065-0273 K
TIME-OF-FLIGHT METHOD