Microwave second-harmonic generation and point-contact spectroscopy of Ni-Nb metallic glasses

O. P. Balkashin, I. K. Yanson, A. Halbritter, G. Mihály

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The point-contact spectra (the energy dependence of the amplitude of the second harmonic of the modulation current) of contacts of NixNb 1-x 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 τ≪10-10s. 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 T∼2.3Tc.

Original languageEnglish
Pages (from-to)1021-1027
Number of pages7
JournalLow Temperature Physics
Volume27
Issue number12
DOIs
Publication statusPublished - 2001

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metallic glasses
harmonic generations
microwaves
microwave frequencies
scattering
occupation
spectroscopy
receivers
waveguides
harmonics
modulation
irradiation
energy
electric potential
electrons
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Microwave second-harmonic generation and point-contact spectroscopy of Ni-Nb metallic glasses. / Balkashin, O. P.; Yanson, I. K.; Halbritter, A.; Mihály, G.

In: Low Temperature Physics, Vol. 27, No. 12, 2001, p. 1021-1027.

Research output: Contribution to journalArticle

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AB - The point-contact spectra (the energy dependence of the amplitude of the second harmonic of the modulation current) of contacts of NixNb 1-x 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 τ≪10-10s. 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 T∼2.3Tc.

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