Tunneling and spin-lattice relaxation of hydrogen dissolved in scandium metal

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.7448· OSTI ID:5564471

Svare, I ^[1]; Torgeson, D R ^[2]; Borsa, F ^[3]

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1. Department of Physics, University of Trondheim, NTH, N-7034 Trondheim, Norway (NO)
2. Ames Laboratory, Iowa State University, Ames, Iowa 50011 (USA) Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (USA)
3. Ames Laboratory, Iowa State University, Ames, Iowa 5011 Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (USA) Department of Physics A. Volta,'' Universita di Pavia, I-27100 Pavia, (Italy)

Some published NMR spin-lattice relaxation data for H in ScH{sub {ital x}} metal solid solutions below 100 K (Lichty {ital et} {ital al}., Phys. Rev. B 39, 2012 (1989)) have been reinterpreted in terms of local tunneling motion in two-well potentials rather than classical over-the-barrier hopping. The asymmetry {ital A} between the wells strongly influences the electron- and phonon-induced tunneling transition rates and also the intensity of the relaxation in the two-level system. The fit to the data uses distributions of {ital A} that broaden with increasing concentrations of H. For the local motion of H in Sc, we find the barrier {ital V}{sub 0}/{ital k}{sub {ital B}}{congruent}3200 K, the ground-state tunnel splitting {Delta}{ital E}{sub {ital T}0}/{ital k}{sub {ital B}}{congruent}0.37 K, and coupling constants to electrons and phonons that have the same orders of magnitude as those for H in Nb.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5564471
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:10; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ATOM TRANSPORT
DATA ANALYSIS
DISPERSIONS
ELEMENTS
HYDROGEN
METALS
MIXTURES
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
RADIATION TRANSPORT
RELAXATION
SCANDIUM
SOLID SOLUTIONS
SOLUTIONS
SPIN-LATTICE RELAXATION
TRANSITION ELEMENTS
TUNNEL EFFECT