Muon spin rotation and magnetic order in the heavy-fermion compound URu/sub 2/Si/sub 2/

Journal Article · Mon Feb 29 23:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.3153· OSTI ID:5356530

MacLaughlin, D E; Cooke, D W; Heffner, R H; Hutson, R L; McElfresh, M W; Schillaci, M E; Rempp, H D; Smith, J L; Willis, J O; Zirngiebl, E

Muon spin rotation and relaxation experiments have been carried out in the paramagnetic and magnetically ordered states of the magnetic heavy-fermion superconductor URu/sub 2/Si/sub 2/. The positive-muon (..mu../sup +/) linewidth ..sigma../sub ..mu../ in zero and low applied fields (approx. <100 Oe) was consistent with nuclear dipolar broadening at temperatures above the ordering temperature T/sub N/, but increased below T/sub N/ to a value of )similarreverse arrowto)0.1 ..mu..s/sup -1/. This is definite evidence for magnetic ordering. However, the value of ..sigma../sub ..mu../ corresponds to a rms local field of only )similarreverse arrowto)1 Oe, which is more than an order of magnitude smaller than expected from an antiferromagnetic (AF) array of U moments ..mu..)similarreverse arrowto)0.03..mu../sub B/, as obtained from neutron diffraction. Either the ..mu../sup +/ site is approximately symmetrically placed between the AF sublattices, or the muon suppresses AF ordering in its vicinity. The isotropic component of the observed ..mu../sup +/ frequency shift is small, and the anisotropic shift is of the order of the calculated dipolar contribution for several candidate ..mu../sup +/ sites (including the symmetric one)

• Research Organization: University of California, Riverside, California 92521
• OSTI ID: 5356530
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ACTINIDE COMPOUNDS
CRYSTALS
DIPOLES
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
LINE BROADENING
LINE WIDTHS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
MULTIPOLES
MUON SPIN RELAXATION
PARAMAGNETISM
PHYSICAL PROPERTIES
POLYCRYSTALS
REFRACTORY METAL COMPOUNDS
RELAXATION
RUTHENIUM COMPOUNDS
RUTHENIUM SILICIDES
SILICIDES
SILICON COMPOUNDS
SPECIFIC HEAT
SQUID DEVICES
SUPERCONDUCTING DEVICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
URANIUM COMPOUNDS
URANIUM SILICIDES
VERY LOW TEMPERATURE