Anomalous resistivity peaks, localization transitions, and the electronic structure of substoichiometric lanthanum trihydrides

Journal Article · Mon Jan 29 04:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.563· OSTI ID:7008976

Shinar, J; Dehner, B; Barnes, R G; Beaudry, B J ^[1]

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1. Ames Laboratory-U.S. Department of Energy, Ames, IA (US) Physics Department, Iowa State University, Ames, Iowa 50011-3020 (US)

The resistivity {rho}({ital T}) of LaH{sub {ital x}} (2.80{le}{ital x}{le}2.90) was determined from {ital Q}-factor measurements at 100 K{lt}{ital T}{lt}700 K. Its temperature coefficient {alpha}{gt}0 is small at {ital T}{le}200 K, and {rho}({ital T}) peaks at some {ital T} between 220 and 260 K. The peak narrows with increasing {ital x} and is extremely sharp for {ital x}{ge}2.86. At higher temperatures the behavior of {rho}({ital T}) is consistent with variable-range hopping. It is suggested that a delocalized band of states at {ital E}{sub {ital F}}, associated with the superlattice of octahedral vacancies, becomes localized and its mobility is quenched when the superlattice collapses above {similar to}240{plus minus}20 K.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 7008976
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:5; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
ENERGY LEVELS
EXPERIMENTAL DATA
FERMI LEVEL
HIGH TEMPERATURE
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM HYDRIDES
LOW TEMPERATURE
MEDIUM TEMPERATURE
NUMERICAL DATA
PHYSICAL PROPERTIES
POINT DEFECTS
RARE EARTH COMPOUNDS
STOICHIOMETRY
SUPERLATTICES
VACANCIES