Isotope dependence of hydrogen tunneling in niobium

Journal Article · Sun Nov 05 23:00:00 EST 1989 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.63.2084· OSTI ID:5304751

Morr, W; Muller, A; Weiss, G ^[1]; Wipf, H ^[2]; Golding, B ^[3]

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1. Institut fuer Angewandte Physik II, Universitaet Heidelberg, D-6900 Heidelberg, (Federal Republic of Germany)
2. Institut fuer Festkoerperphysik, TH Darmstadt, D-6100 Darmstadt, (Federal Republic of Germany)
3. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (USA)

We present ultrasonic experiments on the low-temperature tunneling of H and D interstitials in Nb. Strong isotope effects are observed in the sound velocity and the attenuation. From the temperature dependence of these quantities we determine tunneling matrix elements and relaxation rates for both isotopes. We demonstrate that this isotopic behavior is adequately described by present theories on nonadiabatic interaction of tunneling systems with conduction electrons in the weak-coupling regime.

• OSTI ID: 5304751
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 63:19; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACOUSTIC MEASUREMENTS
ATTENUATION
COUPLING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEUTERIUM
DIFFUSION
ELEMENTS
HYDROGEN
HYDROGEN ISOTOPES
INTERSTITIALS
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
MATRIX ELEMENTS
METALS
NIOBIUM
NONMETALS
NUCLEI
ODD-ODD NUCLEI
POINT DEFECTS
RELAXATION
SOUND WAVES
STABLE ISOTOPES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
TUNNEL EFFECT
TYPE-II SUPERCONDUCTORS
ULTRALOW TEMPERATURE
ULTRASONIC WAVES
VELOCITY
VERY LOW TEMPERATURE