Tunneling of H and D trapped by O(N) in niobium by anelastic relaxation measurements

Journal Article · Mon Dec 01 04:00:00 EST 1986 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.34.7721· OSTI ID:7007158

Cannelli, G; Cantelli, R; Cordero, F

Deuterium trapped by oxygen (nitrogen) in niobium gives rise to two anelastic relaxation processes at 1.5 and 4 K at 20 kHz. The process at higher temperature and the analogous one observed in Nb-O(N)-H have been interpreted in terms of a two-level tunneling system (TLS) interacting with phonons or electrons. Two-phonon and electron interactions in the superconducting state give nearly equivalent fits to the data. In both cases the tunneling matrix element is found to be about 0.9 MeV without appreciable isotope effect; the coupling parameters of the TLS to electrons and phonons have also been estimated.

• Research Organization: Consiglio Nazionale delle Ricerche, Istituto di Acustica ''O. M. Corbino,'' via Cassia 1216, I-00189, Roma, Italy
• OSTI ID: 7007158
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 34:11; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
CHEMICAL REACTIONS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DEUTERATION
ELEMENTS
INTERSTITIALS
ISOTOPE EFFECTS
METALS
NIOBIUM
NONMETALS
OXYGEN
POINT DEFECTS
QUANTITY RATIO
RELAXATION
SUPERCONDUCTORS
TRANSITION ELEMENTS
TUNNEL EFFECT
ULTRALOW TEMPERATURE