Magnetic ordering of Gd/sub x/Er/sub 1-x/Rh/sub 4/B/sub 4/ near the superconducting region
Gd/sub x/Er/sub 1-x/Rh/sub 4/B/sub 4/ exhibits superconductivity at some critical temperature T/sub c/ followed by the onset of long-range ferromagnetic ordering at a lower temperature and a loss of superconductivity for x < x/sub c/ approx. = 0.28, where x/sub c/ is the critical concentration at which superconductivity is suppressed. For x above x/sub c/, the compound is no longer superconducting but is still magnetically ordered. We have made ac resistivity R, ac magnetic susceptibility chi, and dc magnetization measurements on samples with x near x/sub c/. For x approx. = 0.28, the salient features for the R and chi measurements are: (1) In zero external field a sharp maximum in the ac chi(T) and a minimum in R(T) are observed. With a small external dc magnetic field (approx. 10/sup 2/ Oe), the extrema in chi(T) and R(T) are depressed and smeared considerably with a corresponding shift in the temperatures at which the extrema occur. (2) The sample is not superconducting down to 0.6 K. (3) In the presence of a dc magnetic field, a second ac chi peak apppears at a slightly higher temperature. (4) The field dependence of the ac susceptibility resembles that of a spin glass. Details of the field dependence of these observations and the nature of these phenomena will be presented.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6465742
- Report Number(s):
- LA-UR-78-2712; CONF-781114-3
- Country of Publication:
- United States
- Language:
- English
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360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
BORON ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ERBIUM ALLOYS
GADOLINIUM ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RARE EARTH ALLOYS
RHODIUM ALLOYS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE