Spectroscopy of electron—phonon interaction of superconducting point contacts: experimental aspects

N.L. Bobrov
B.Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, prosp. Lenina 47, Kharkov, 61103, Ukraine

The recovering procedure of the electron—phonon interaction (EPI) functions from the additional nonlinearities of the current-voltage curve (I—V curve) of point contacts associated with an excess current is considered. The approach proposed takes into account both inelastic scattering, which causes suppression of the excess current in the reabsorption of nonequilibrium phonons by electrons undergoing Andreev reflection (Andreev electrons), and elastic processes associated with the electron—phonon renormalization of the energy spectrum in a superconductor. The results obtained are systematically expounded for both the ballistic contacts, wherein the second derivatives of the I—V curve in the normal state are proportional to the EPI functions, and inhomogeneous contacts (with dirty constrictions and clean banks), whose second derivatives in the normal state are either free of phonon singularities or weakly pronounced.

Keywords: Yanson point-contact spectroscopy, electron—phonon coupling, superconductivity, energy gap, excess current
PACS: 73.40.Jn, 74.25.Kc, 74.45.+c, 74.50.+r (all)
DOI: 10.3367/UFNe.2019.11.038693
URL: https://ufn.ru/en/articles/2020/11/b/
Web of Science

000613920600002
Scopus

2-s2.0-85101554394
ADS NASA

2020PhyU...63.1072B
Citation: Bobrov N L "Spectroscopy of electron—phonon interaction of superconducting point contacts: experimental aspects" Phys. Usp. 63 1072–1091 (2020)

BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks

Received: 7th, August 2019, revised: 23rd, October 2019, accepted: 11th, November 2019

Оригинал: Бобров Н Л «Спектроскопия электрон-фононного взаимодействия сверхпроводящих микроконтактов: экспериментальные аспекты» УФН 190 1143–1163 (2020); DOI: 10.3367/UFNr.2019.11.038693

References (40) Cited by (4) Similar articles (20) ↓

V.M. Svistunov, M.A. Belogolovskii, O.I. Chernyak “Tunnel investigations of metals at high pressures” 30 1–22 (1987)
M.Yu. Kupriyanov, K.K. Likharev “Josephson effect in high-temperature superconductors and in structures based on them” 33 (5) 340–364 (1990)
V.M. Svistunov, M.A. Belogolovskii, A.I. Khachaturov “Electron-phonon interaction in high-temperature superconductors” 36 (2) 65–80 (1993)
Yu.A. Izyumov, Yu.N. Proshin, M.G. Khusainov “Competition between superconductivity and magnetism in ferromagnet/superconductor heterostructures” 45 109–148 (2002)
A.S. Alexandrov, A.B. Krebs “Polarons in high-temperature superconductors” 35 (5) 345–383 (1992)
A.A. Romanyukha, Yu.N. Shvachko, V.V. Ustinov “Electron paramagnetic resonance and related phenomena in high-temperature superconductors” 34 (10) 862–882 (1991)
G.B. Lesovik, I.A. Sadovskyy “Scattering matrix approach to the description of quantum electron transport” 54 1007–1059 (2011)
Yu.M. Shukrinov “Anomalous Josephson effect” 65 317–354 (2022)
A.S. Borukhovich “Quantum tunneling in multilayers and heterostructures with ferromagnetic semiconductors” 42 653–667 (1999)
E.Z. Meilikhov “Structural features, critical currents and current-voltage characteristics of high temperature superconducting ceramics” 36 (3) 129–151 (1993)
V.L. Ginzburg, D.A. Kirzhnits “High-temperature superconductivity (a review of theoretical ideas)” 30 671–675 (1987)
G.F. Zharkov “The Josephson tunneling effect in superconductors” 9 198–209 (1966)
B.T. Geilikman “The electron mechanism of superconductivity” 9 142–152 (1966)
N.N. Bogolyubov “The compensation principle and the self-consistent field method” 2 236–254 (1959)
A.I. Buzdin, L.N. Bulaevskii et al “Magnetic superconductors” 27 927–953 (1984)
N.V. Zavaritskii “Electron-phonon interaction and characteristics of metal electrons” 15 608–625 (1973)
I.L. Rozental’ “Interaction of cosmic muons of high energy” 11 49–65 (1968)
V.M. Murav’ev, I.V. Kukushkin “Collective plasma excitations in two-dimensional electron systems” 63 975–993 (2020)
I.M. Dremin “Unexpected interaction properties between high energy protons” 60 333–344 (2017)
V.E. Bisti, A.B. Van’kov et al “Magnetoexcitons in two-dimensional electronic systems” 58 315–329 (2015)

The list is formed automatically.