Abstract
Low-temperature tunneling of H or D interstitials trapped by impurity atoms such as O or N in Nb has been investigated by various methods such as specific heat, thermal conductivity, ultrasonic (anelastic) and neutron spectroscopic measurements. The experiments show (i) that the O (or N) impurity atoms trap hydrogen interstitials at low temperatures, and (ii) that the trapped hydrogen is delocalized among (most likely) two nearest-neighbor tetrahedral interstitial sites (for a detailed discussion see /1,2/).
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Gutsmiedl, P., Schiekhofer, M., Neumaier, K., Wipf, H. (1987). H and D Tunneling in Nb: Dependence on Defect Concentration and Trapping Center. 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_27
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