Transport properties and point contact spectra of Ni_xNb_{1-x} metallic glasses

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dc.creatorHalbritter, A.
dc.creatorKolesnychenko, O. Yu.
dc.creatorMihaly, G.
dc.creatorShklyarevskii, O. I.
dc.creatorvan Kempen, H.
dc.date2000-01-10
dc.date2000-02-01
dc.date.accessioned2026-07-25T21:30:20Z
dc.descriptionBulk resistivity and point contact spectra of Ni_xNb_{1-x} metallic glasses have been investigated as functions of temperature (0.3-300K) and magnetic field (0-12T). Metallic glasses in this family undergo a superconducting phase transition determined by the Nb concentration. When superconductivity was suppressed by a strong magnetic field, both the bulk sample R(T) and the point contact differential resistance curves of Ni_xNb_{1-x} showed logarithmic behavior at low energies, which is explained by a strong electron - "two level system" coupling. We studied the temperature, magnetic field and contact resistance dependence of Ni_{44}Nb_{56} point-contact spectra in the superconducting state and found telegraph-like fluctuations superimposed on superconducting characteristics. These R(V) characteristics are extremely sensitive detectors for slow relaxing "two level system" motion.
dc.description4 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0001106
dc.identifierhttp://arxiv.org/abs/cond-mat/0001106
dc.identifierPhys. Rev. B 61, 5846 (2000)
dc.identifierdoi:10.1103/PhysRevB.61.5846
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/80132
dc.subjectDisordered Systems and Neural Networks
dc.subjectSuperconductivity
dc.titleTransport properties and point contact spectra of Ni_xNb_{1-x} metallic glasses
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