Advertisement

Tunneling and Spin-Lattice Relaxation of Hydrogen Dissolved in Scandium Metal

  • I. Svare
  • D. R. Torgeson
  • F. Borsa
Conference paper

Abstract

The NMR spin-lattice relaxation data 1) for H in scandium metal solid solutions below 100 K have been reinterpreted in terms of local tunneling motion in two-well potentials rather than as classical over-the-barrier hopping. The asymmetry 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 use distributions of A that broaden with increasing concentrations of H. For the local motion of H in Sc we find the sinusoidal barrier of height = 3200 K from inelastic neutron scattering 2), which gives the ground state tunnel splitting = 0.37 K. Then the coupling constants to electrons and phonons fitted to the spin relaxation are about the same as those for H in Nb 3), 4).

PACS

76.60 Es 61.70 Bv 66.30 Jt 

References

  1. 1).
    RL Lichty, JW Han, R Ibanez-Meier, DR Torgeson, RG Barnes, EFW Seymour, CA Sholl, Phys. Rev. B 39, 2012 (1989)ADSCrossRefGoogle Scholar
  2. 2).
    TJ Udovic, JJ Rush, IS Anderson and RG Barnes, Phys. Rev. B 41, 3460 (1990).ADSCrossRefGoogle Scholar
  3. 3).
    H Wipf, D Steinbinder, K Neumaier, P Gutsmiedl, A Magerl and AJ Dianoux, Europhys. Lett. 4, 1379 (1987)ADSCrossRefGoogle Scholar
  4. 4).
    I Svare, Physica B 145, 281 (1987)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • I. Svare
    • 1
  • D. R. Torgeson
    • 2
  • F. Borsa
    • 2
    • 3
  1. 1.Department of PhysicsUniversity of Trondheim, NTHTrondheimNorway
  2. 2.Ames Laboratory and Department of PhysicsIowa State UniversityAmesUSA
  3. 3.Department of Physics “A.Volta”Universita di PaviaPaviaItaly

Personalised recommendations