The point-contact spectra (the energy dependence of the amplitude of the second harmonic of the modulation current) of contacts of metallic glasses are measured at audio (3726 Hz) and microwave (9.5 GHz) frequencies. It is established for the first time in rf dynamic experiments that the low-energy spectral feature due the scattering of electrons on two-level systems (TLSs) in the contact is observed at microwave frequencies as well. This is direct evidence of the existence of a fast relaxation process in the contacts, with a characteristic time There is also a small contribution from slower scattering processes. It is found that the videodetection signal contains a component due to a steady-state nonequilibrium occupation of the states of the TLSs under microwave irradiation. The coupling efficiency of the contact with the waveguide and rf receiver is estimated to be 5–7%. A slight minimum of the resistance at zero voltage observed for some of the contacts is attributed to superconducting fluctuations of the order parameter at a temperature
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December 2001
Research Article|
December 01 2001
Microwave second-harmonic generation and point-contact spectroscopy of Ni–Nb metallic glasses
O. P. Balkashin;
O. P. Balkashin
B. Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of Ukraine, pr. Lenina 47, 61103 Kharkov, Ukraine
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I. K. Yanson;
I. K. Yanson
B. Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of Ukraine, pr. Lenina 47, 61103 Kharkov, Ukraine
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A. Halbritter;
A. Halbritter
Institute of Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary
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G. Mihály
G. Mihály
Institute of Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary
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Low Temp. Phys. 27, 1021–1027 (2001)
Citation
O. P. Balkashin, I. K. Yanson, A. Halbritter, G. Mihály; Microwave second-harmonic generation and point-contact spectroscopy of Ni–Nb metallic glasses. Low Temp. Phys. 1 December 2001; 27 (12): 1021–1027. https://doi.org/10.1063/1.1430846
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