Magnetic interactions in ternary superconductors

Journal Article · Thu Mar 01 04:00:00 EST 1979 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.327150· OSTI ID:6121168

Shenoy, G K; Dunlap, B D; Fradin, F Y; Kimball, C W; Potzel, W; Proebst, F; Kalvius, G M

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. We present results of our 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 Laboratory, Argonne, Illinois 60439
• OSTI ID: 6121168
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:B3; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
COHERENT SCATTERING
DIFFRACTION
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
MOESSBAUER EFFECT
NEUTRON DIFFRACTION
NUCLEAR MAGNETIC RESONANCE
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RESONANCE
SCATTERING
SUPERCONDUCTORS
TYPE-II SUPERCONDUCTORS