Effect of high pressure on the electrical resistivity of the heavy-fermion compound UBe sub 13

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.6062· OSTI ID:6228994

McElfresh, M W; Maple, M B ^[1]; Willis, J O; Fisk, Z; Smith, J L; Thompson, J D ^[2]

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1. Department of Physics, University of California-San Diego, La Jolla, CA (USA) Institute for Pure and Applied Physical Sciences, University of California-San Diego, La Jolla, CA (USA)
2. Los Alamos National Laboratory, P.O. Box 1663, University of California, Los Alamos, NM (USA)

The electrical resistivity {rho} of the heavy-electron superconductor UBe{sub 13} was investigated over temperatures ranging from 1 to 300 K and at high pressures from 12 to 152 kbar. The temperature, {ital T}{sub max}, at which {rho} attains a maximum increases linearly with pressure at two limiting rates: 0.25 K/kbar below {approximately}30 kbar and 0.65 K/kbar above {approximately}30 kbar. At low temperatures, the {rho}-versus-{ital T} data can be described by the expression {rho}={rho}{sub 0}+{ital AT}{sup 2} over a temperature interval of {approximately}1 K at 12 kbar to more than 16 K at 152 kbar. The coefficient {ital A} can be related to the Fermi-liquid energy scale {ital T}{sup *} by {ital A}{sup {minus}1/2}{proportional to}{ital T}{sup *}. The pressure dependence of {ital A}{sup {minus}1/2} also increases linearly with pressure at two limiting rates, with a crossover at about 50 kbar. The similarity in the pressure dependences of {ital T}{sub max} and {ital A}{sup {minus}1/2} suggests that both parameters are proportional to a single energy scale, while the changes in pressure dependence of {ital T}{sub max} and {ital A}{sup {minus}1/2} may represent a crossover from heavy-fermion to intermediate-valence behavior.

• DOE Contract Number: FG03-86ER45230
• OSTI ID: 6228994
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:10; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOY SYSTEMS
ALLOYS
BERYLLIUM ALLOYS
BINARY ALLOY SYSTEMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INTERMETALLIC COMPOUNDS
LOW TEMPERATURE
MEDIUM TEMPERATURE
PHYSICAL PROPERTIES
PRESSURE EFFECTS
SUPERCONDUCTORS
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VERY HIGH PRESSURE
VERY LOW TEMPERATURE