Magnetic interactions in ternary superconductors
Numerous ternary superconductors containing rare-earth atoms have recently been studied in order to investigate the magnetic interactions between the conduction electrons and local magnetic moments. These investigations range from the evaluation of the strength of spin-flip scattering of the conduction electrons off the rare-earth moments to the problem of the coexistence of superconductivity and magnetic order. Results are presented of studies on (Eu,Sn)Mo/sub 6/S/sub 8/, ErRh/sub 4/B/sub 4/, Er/sub 1-x/Ho/sub x/Rh/sub 4/B/sub 4/ and Er/sub 1-x/Gd/sub x/Rh/sub 4/B/sub 4/ using primarily the Moessbauer effect in /sup 151/Eu and /sup 166/Er, and nuclear magnetic resonance of /sup 95/Mo. The paramagnetic hyperfine spectra of the rare-earth ions indicate a weak coupling of the 4f magnetic moment to the conduction electrons. The enhanced H/sub c2/ value in (Eu,Sn)Mo/sub 6/S/sub 8/ is found to be related to a negative s-band polarization at the Mo site. The magnetic moment on the Er atom in ErRh/sub 4/B/sub 4/ (and in related materials) in the magnetically ordered state is found to be about 8.3 ..mu../sub B/. This is 30% larger than that measured from neutron diffraction studies, indicating that only a component of the moment shows long-range magnetic order.
- Research Organization:
- Argonne National Lab., IL (USA); Northern Illinois Univ., Dekalb (USA); Technische Univ. Muenchen (Germany, F.R.)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6058731
- Report Number(s):
- CONF-781114--13
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BORIDES
BORON COMPOUNDS
CHALCOGENIDES
ERBIUM BORIDES
ERBIUM COMPOUNDS
EUROPIUM COMPOUNDS
EUROPIUM SULFIDES
GADOLINIUM BORIDES
GADOLINIUM COMPOUNDS
HOLMIUM BORIDES
HOLMIUM COMPOUNDS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
MOESSBAUER EFFECT
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NUCLEAR MAGNETIC RESONANCE
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RESONANCE
RHODIUM BORIDES
RHODIUM COMPOUNDS
SPIN FLIP
SULFIDES
SULFUR COMPOUNDS
SUPERCONDUCTORS
TIN COMPOUNDS
TIN SULFIDES
TRANSITION ELEMENT COMPOUNDS