Abstract
Low-temperature measurements of the thermal conductivity κ (0.3K≦T≦5K) and of the specific heatC (0.07K≦T≦3.5K) of splat-cooled amorphous superconducting Zr0.67Ni0.33(T c ≈2.7K) after different annealing stages are reported. κ increases progressively (up to 55%) after annealing. An analysis of κ with the help of normal-state measurements belowT c in an overcritical field shows that the phonon-electron scattering remains unaltered after annealing. Hence the increase in κ must be entirely attributed to structure-induced (“intrinsic”) scattering, i.e. by two-level tunneling states (TLS) at low temperatures (T≦1K). The specific heat shows a small decrease aboveT c (by 8%) which is attributed to a small diminution of the electronic density of states at the Fermi level and to a small increase in the Debye temperature. ForT≪T c where TLS dominate, the specific heatC decreases less upon annealing than expected from the increase of κ in the standard tunneling model. This points to a change in the TLS relaxation time spectrum upon annealing, as observed previously for Zr x Cu1−x glasses.
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Gronert, H.W., Herlach, D.M., Schröder, A. et al. Thermal conductivity and specific heat of amorphous Zr0.67Ni0.33 after structural relaxation. Z. Physik B - Condensed Matter 63, 173–178 (1986). https://doi.org/10.1007/BF01309235
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DOI: https://doi.org/10.1007/BF01309235