SmB[sub 6]: Kondo insulator or exotic metal

Journal Article · Mon Feb 27 04:00:00 EST 1995 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.74.1629· OSTI ID:6458505

Cooley, J C; Aronson, M C; Fisk, Z; Canfield, P C ^[1]

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1. The Harrison M. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States) National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306 (United States) Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States)

High pressure resistivity and Hall effect measurements on SmB[sub 6] show that the activation gap [Delta] vanishes discontinuously between 45 and 53 kbar, yielding at high pressures a mass-enhanced Fermi liquid phase. The low temperature transport is dominated by extended states in the gap with unusual superunitarity scattering properties, and a carrier density which grows almost exponentially with reduced [Delta], saturating below 45 kbar near 0.15 electron per unit cell. Our results are inconsistent with hybridization gap models and suggest a striking parallel to Mott-Hubbard insulators.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6458505
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 74:9; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BORIDES
BORON COMPOUNDS
CARRIER DENSITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
ENERGY GAP
HALL EFFECT
HIGH PRESSURE
KONDO EFFECT
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
RARE EARTH COMPOUNDS
SAMARIUM BORIDES
SAMARIUM COMPOUNDS