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The Influence of Electrons on the Tunneling State of a Hydrogen Atom in a Metal

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Quantum Aspects of Molecular Motions in Solids

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 17))

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Abstract

The thermal destruction of a tunneling state in a molecular crystal, which becomes observable in a neutron spectroscopic experiment say above 10 K, is generally attributed to interactions with phonons. If the tunnel system is in a metallic environment there is an additional relaxation path originating from the interaction with electrons. We have studied by inelastic neutron scattering the tunneling of a single proton in Nb(OH)x with x = 0.002 and x = 0.0002 from 0.1 to 10 K in both a superconducting and a normal conducting environment (applied magnetic field 0.7 T). These data show that the interaction of the H tunnel state with conduction electrons dominates the observed damping in this temperature range. In addition, different values for the tunnel splitting are found in the superconducting state (Js = 226 μeV) and in the normal conducting state (JN = 206 μeV). This renormalisation and the damping are described consistently by only one coupling parameter K = 0.053.

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References

  1. See also W. Press: “Single-Particle Rotations in Molecular Crystals” in Springer Tracts Mod. Phys. 92 ( Springer, New York 1981 )

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  5. A. Magerl et al.: to be published

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  13. The coupling strength is also given as a product of the electronic density of states at the Fermi level p with an appropriate matrix element V⊥ (see e.g. Refs. 2 and 9). Corresponding formula become identical for 2 K = (ρV⊥)2.

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Author information

Authors and Affiliations

  1. Institut für Festkörperphysik, Technische Hochschule Darmstadt, Hochschulstr. 2, D-6100, Darmstadt, Fed. Rep. of Germany

    H. Wipf & D. Steinbinder

  2. Walther-Meissner-Institut für Tieftemperaturforschung, Walther-Meissner-Str. 8, D-8046, Garching, Fed. Rep. of Germany

    K. Neumaier & P. Gutsmiedl

  3. Institut Laue-Langevin, 156X, F-38042, Grenoble Cedex, France

    A. Magerl & A. J. Dianoux

Authors
  1. H. Wipf
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  2. D. Steinbinder
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  3. K. Neumaier
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  4. P. Gutsmiedl
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  5. A. Magerl
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  6. A. J. Dianoux
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Editor information

Editors and Affiliations

  1. Institut Laue-Langevin, Avenue des Martyrs, Centre de Tri 156X, F-38042, Grenoble Cedex, France

    Anton Heidemann , Andreas Magerl  & Dieter Richter ,  & 

  2. Institut für Festkörperforschung, Kernforschungsanlage Jülich GmbH, Postfach 1913, D-5170, Jülich, Fed. Rep. of Germany

    Michael Prager  & Tasso Springer (Professor) &  (Professor)

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© 1987 Springer-Verlag Berlin Heidelberg

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Wipf, H., Steinbinder, D., Neumaier, K., Gutsmiedl, P., Magerl, A., Dianoux, A.J. (1987). The Influence of Electrons on the Tunneling State of a Hydrogen Atom in a Metal. In: Heidemann, A., Magerl, A., Richter, D., Prager, M., Springer, T. (eds) Quantum Aspects of Molecular Motions in Solids. Springer Proceedings in Physics, vol 17. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-71914-1_26

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  • DOI: https://doi.org/10.1007/978-3-642-71914-1_26

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-71916-5

  • Online ISBN: 978-3-642-71914-1

  • eBook Packages: Springer Book Archive

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