Muon spin relaxation and Knight shift in the heavy-fermion superconductor UPt/sub 3/

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5542065

Cooke, D W; Heffner, R H; Hutson, R L; Schillaci, M E; Smith, J L; Willis, J O; MacLaughlin, D E; Boekema, C; Lichti, R L; Denison, A B

Positive muon spin relaxation experiments have been conducted on the heavy-fermion superconductor UPt/sub 3/ in both the normal and superconducting states for zero, transverse, and longitudinally applied magnetic fields. Below 6 K in zero applied field, the ..mu../sup +/ relaxation rate is approximately twice that expected from /sup 195/Pt nuclear dipolar relaxation alone. Transverse- and longitudinal-field measurements show that the observed relaxation rate depends on magnetic field and is quasistatic in origin. It is suggested that the onset of very weak (approx.10/sup -3/ ..mu../sub B//U atom) magnetic ordering below approximately 6 K is responsible for the observed increase in the relaxation rate. ..mu../sup +/ Knight shift measurements in the normal state of UPt/sub 3/ show a temperature dependent shift K/sub ..mu../ which tracks the bulk susceptibility chi. From the K/sub ..mu../ vs chi plot, a ..mu../sup +/ hyperfine field of approximately 100 Oe/..mu../sub B/ is extracted.

• Research Organization: Los Alamos National Lab., NM (USA); California Univ., Riverside (USA); San Jose State Univ., CA (USA); Texas Tech Univ., Lubbock (USA); Wyoming Univ., Laramie (USA); Cincinnati Univ., OH (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5542065
• Report Number(s): LA-UR-86-2157; CONF-8606134-2; ON: DE86012398
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ELEMENTARY PARTICLES
FERMIONS
KNIGHT SHIFT
LEPTONS
MAGNETIC FIELDS
MUONS
MUONS PLUS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
RELAXATION
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
URANIUM ALLOYS