Electron paramagnetic resonance in gadolinium near T/sub C/

Journal Article · Thu Sep 01 04:00:00 EDT 1977 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.16.1802· OSTI ID:7092002

Burgardt, P; Seehra, M S

Electron paramagnetic resonance (EPR) in single crystals of gadolinium metal has been studied near its Curie temperature T/sub C/ (approx. = 293 K). The EPR linewidth ..delta..H and the resonance field H/sub r/ are measured as a function of temperature between 280 and 330 K, for H parallel c axis and H perpendicular c axis. Between 300 and 330 K the line shape is Dysonian and ..delta..H shows a crossover behavior: i.e., ..delta..H increases as T ..-->.. T/sup +//sub C/, reaching a maximum at T/sub m/ > T/sub C/ and then decreases for lower temperatures. This behavior of ..delta..H is similar to the observations in ferromagnets CrBr/sub 3/, EuO, and Ni. The derived values for the critical spin-spin relaxation rate in Gd are observed to scale as chi/sup ..nu../where chi is the uniform field susceptibility. The observed value of ..nu.. approx. = 0.84 is about half the theoretical value, similar to the discrepancy observed in antiferromagnets.

• Research Organization: Physics Department, West Virginia University, Morgantown, West Virginia 26506
• OSTI ID: 7092002
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 16:5; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
CURIE POINT
ELECTRON SPIN RESONANCE
ELEMENTS
GADOLINIUM
LINE WIDTHS
MAGNETIC FIELDS
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
METALS
PHYSICAL PROPERTIES
RARE EARTHS
RELAXATION
RESONANCE
SPIN-SPIN RELAXATION
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE