Transport properties and point contact spectra of NixNb1-x metallic glasses
A. Halbritter, O. Yu. Kolesnychenko, G. Mihaly, O. I. Shklyarevskii, H. van Kempen
Abstract
Bulk resistivity and point contact spectra of NixNb1-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 NixNb1-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 Ni44Nb56 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.
Create a lesson
Related papers
Orbital cancellation and reentrant localization in a quasiperiodic trimer ladder
Xin Wang, Pei-Jie Chang, Quanfeng Lu et al.
Quantum Localization in Geometric Complex Networks
Jan Lewenstein-Sanpera, Tobias Grass, M. Àngeles Serrano et al.
Eigenstate transitions and critical transport in 3D Aubry-André model
Pragna Das, Lev Vidmar, Miroslav Hopjan
Weyl's theorem and the theoretical origin of Boson peak in two-dimensional scalar spring network
Cunyuan Jiang
On physical implementability of reinforcement-learning-driven reasoning
Eiji Konishi
The Stone-Wales trefoil: a new topological defect in graphene
M. V. Kondrin, Y. B. Lebed, V. V. Brazhkin