Muon spin relaxation in CeCu/sub 2/Si/sub 2/ and muon Knight shift in various heavy-fermion systems

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

OSTI ID:5338521

Uemura, Y J; Kossler, W J; Hitti, B; Kempton, J R; Schone, H E; Yu, X H; Stronach, C E; Lankford, W F; Noakes, D R; Keitel, R

Positive muon spin precession has been observed in varius heavy-fermion systems in the transverse external magnetic field. In the superconductor CeCu/sub 2.1/Si/sub 2/, the relaxation rate of muon spins increases rapidly with decreasing temperature below T/sub c/. This is interpreted as the results of the inhomogeneous fields due to the imperfect penetration of the external field into the type-II superconducting state. The magnetic-field penetration depth lambda is derived from the observed muon spin relaxation rate. lambda is about 1200 A at T approx. 0.5T/sub c/, and the temperature dependence of lambda is consistent with the relation expected for a BCS superconductor. We have also measured the muon Knight shift K/sub ..mu../ in the normal (or paramagnetic) state of various heavy-fermion systems. K/sub ..mu../ is large and negative (about -1000 approx. -3000 ppM at T = 10 K) for CeCu/sub 2/Si/sub 2/, UPt/sub 3/ and CeAl/sub 3/, while more complicated signals are measured in CePb/sub 3/ and CeB/sub 6/. The negative muon Knight shift in the non-magnetic heavy-fermion systems is discussed in terms of the Kondo-coupling between the conduction- and f-electrons.

• Research Organization: Brookhaven National Lab., Upton, NY (USA); College of William and Mary, Williamsburg, VA (USA); Virginia State Univ., Petersburg (USA); George Mason Univ., Fairfax, VA (USA); TRIUMF, Vancouver, British Columbia (Canada); Saskatchewan Univ., Saskatoon (Canada)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5338521
• Report Number(s): BNL-38445; CONF-8606134-5; ON: DE86014852
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE COMPOUNDS
ALLOYS
ALUMINIUM COMPOUNDS
BORIDES
BORON COMPOUNDS
CERIUM BORIDES
CERIUM COMPOUNDS
CERIUM SILICIDES
COPPER COMPOUNDS
COPPER SILICIDES
ELEMENTARY PARTICLES
FERMIONS
INTERMETALLIC COMPOUNDS
KNIGHT SHIFT
LEAD COMPOUNDS
LEPTONS
MUONS
PLATINUM COMPOUNDS
RARE EARTH COMPOUNDS
RELAXATION
SILICIDES
SILICON COMPOUNDS
SPIN-LATTICE RELAXATION
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
URANIUM COMPOUNDS