Paramagnetic resonance linebroadening and spin--spin relaxation near magnetic critical points
Conference
·
· AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 261-267
OSTI ID:4135844
Recent studies of EPR linewidths near critical points in magnetic insulators are reviewed. Behavior of representative three-dimensional antiferromagnets RbMnF$sub 3$, MnF$sub 2$, NiCl$sub 2$, MnO, and MnS and ferromagnets EuO and CrBr$sub 3$ is analyzed. The connection between the EPR linewidth and the relaxation rate of the fluctuations in the total magnetization in zero field is established. Symmetry arguments are used to confirm the hypothesis that the anomalies in the EPR linewidth arise from a coupling between the fluctuations in the total magnetization and the long wavelength fluctuations in the order parameter. This coupling is induced by anisotropic terms in the Hamiltonian. The dependence of the linewidth on temperature and on the direction and magnitude of the applied field is discussed. The contribution to the linewidth coming from the spin-phonon interaction is also considered. (9 figures, 33 references) (auth)
- Research Organization:
- West Virginia Univ., Morgantown
- NSA Number:
- NSA-33-003442
- OSTI ID:
- 4135844
- Conference Information:
- Journal Name: AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 261-267
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron paramagnetic resonance in gadolinium near T/sub C/
APPLICATION OF SPIN WAVE THEORY TO THREE MAGNETIC SALTS
Critical and paramagnetic spin fluctuations in Heisenberg magnets
Journal Article
·
Thu Sep 01 00:00:00 EDT 1977
· Phys. Rev., B; (United States)
·
OSTI ID:7092002
APPLICATION OF SPIN WAVE THEORY TO THREE MAGNETIC SALTS
Journal Article
·
Sat Nov 30 23:00:00 EST 1963
· Proc. Phys. Soc. (London)
·
OSTI ID:4133183
Critical and paramagnetic spin fluctuations in Heisenberg magnets
Journal Article
·
Tue Jan 31 23:00:00 EST 1989
· Phys. Rev. B: Condens. Matter; (United States)
·
OSTI ID:6552326
Related Subjects
*CHROMIUM BROMIDES-- ELECTRON SPIN RESONANCE
*EUROPIUM OXIDES-- ELECTRON SPIN RESONANCE
*MANGANESE FLUORIDES-- ELECTRON SPIN RESONANCE
*MANGANESE OXIDES-- ELECTRON SPIN RESONANCE
*MANGANESE SULFIDES-- ELECTRON SPIN RESONANCE
*NICKEL CHLORIDES-- ELECTRON SPIN RESONANCE
*RUBIDIUM FLUORIDES-- ELECTRON SPIN RESONANCE
360204* --Materials--Ceramics
Cermets & Refractories-- Physical Properties
COUPLING
LINE BROADENING
LINE WIDTHS
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
N50330 --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Properties
Structure & Phase Studies
ORDER PARAMETERS
RELAXATION
SPIN-SPIN RELAXATION
TEMPERATURE DEPENDENCE
VARIATIONS
*EUROPIUM OXIDES-- ELECTRON SPIN RESONANCE
*MANGANESE FLUORIDES-- ELECTRON SPIN RESONANCE
*MANGANESE OXIDES-- ELECTRON SPIN RESONANCE
*MANGANESE SULFIDES-- ELECTRON SPIN RESONANCE
*NICKEL CHLORIDES-- ELECTRON SPIN RESONANCE
*RUBIDIUM FLUORIDES-- ELECTRON SPIN RESONANCE
360204* --Materials--Ceramics
Cermets & Refractories-- Physical Properties
COUPLING
LINE BROADENING
LINE WIDTHS
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
N50330 --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Properties
Structure & Phase Studies
ORDER PARAMETERS
RELAXATION
SPIN-SPIN RELAXATION
TEMPERATURE DEPENDENCE
VARIATIONS