Effects of dilute Pt on the Gd/sup 3 +/ ESR lineshape in ScH/sub 1. 9/

Journal Article · Wed Mar 01 04:00:00 EST 1978 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.324932· OSTI ID:5121875

Venturini, E L

Gd/sup 3 +/ electron spin resonance (ESR) at 9.8 GHz has been studied from liquid helium to liquid nitrogen temperatures in a metallic scandium dihydride host containing 0.5 atomic percent Gd and from 0 to 1 atomic percent Pt. The sample without the Pt has a residual or zero-temperature linewidth of 180 +- 5 Oe and a g-factor of 1.993 +- 0.003. The addition of nonmagnetic Pt impurities has little effect on the slope of the ESR linewidth versus temperature or on the position of the line center (g-factor), but it drastically reduces the residual linewidth. For a sample containing 0.25 atomic percent Pt the residual linewidth is 71 +- 3 Oe, less than 40% of that for the sample without Pt. A careful analysis of the ESR lineshape shows that it is neither Lorentzian nor a combination of Gaussian and Lorentzian components. We can accurately describe the experimental shape using a Lorentzian function with a single center and a half-width uniformly distributed between a minimum and maximum value. Using this model for the Gd/sup 3 +/ ESR lineshape, we find that the addition of nonmagnetic Pt impurities sharply reduces the maximum half-width of the distribution while producing a much smaller change in the minimum half-width.

• Research Organization: Sandia Laboratories, Albuquerque, New Mexico 87115
• OSTI ID: 5121875
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 49:3; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ATOMIC IONS
CHARGED PARTICLES
ELECTRON SPIN RESONANCE
ELEMENTS
GADOLINIUM COMPOUNDS
GADOLINIUM HYDRIDES
GADOLINIUM IONS
HYDRIDES
HYDROGEN COMPOUNDS
IMPURITIES
IONS
LINE WIDTHS
MAGNETIC RESONANCE
METALS
PLATINUM
PLATINUM METALS
RARE EARTH COMPOUNDS
RESONANCE
SCANDIUM COMPOUNDS
SCANDIUM HYDRIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS