2014
DOI: 10.1063/1.4869565
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Point-contact spectroscopy of electron-phonon interaction in superconductors

Abstract: The possibility to reconstruct the electron-phonon interaction (EPI) function was demonstrated for S − c − N and S − c − S point contacts using the superconducting inelastic contribution to the excess current caused by Andreev reflection processes. Superconductors with both weak (Sn, Al) and strong (Pb, In) EPI were considered. It was shown that in the latter case it is necessary to account for the elastic component of current which is related to the frequency dependence of the superconducting energy gap arisi… Show more

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Cited by 9 publications
(8 citation statements)
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“…2, 3, 4 of Ref. [4]) show that in the ballistic regime the superconducting contribution to the spectrum is small compared to the spectrum in the normal state and is no more than 20%. As the elastic electron mean free path falls off, the intensity of the point-contact spectrum in the normal state decreases and becomes much lower in the diffusive limit than in the ballistic limit.…”
Section: Discussion Of Resultsmentioning
confidence: 91%
See 1 more Smart Citation
“…2, 3, 4 of Ref. [4]) show that in the ballistic regime the superconducting contribution to the spectrum is small compared to the spectrum in the normal state and is no more than 20%. As the elastic electron mean free path falls off, the intensity of the point-contact spectrum in the normal state decreases and becomes much lower in the diffusive limit than in the ballistic limit.…”
Section: Discussion Of Resultsmentioning
confidence: 91%
“…2, 5 and 6 in Ref. [4]). There the inelastic superconducting contribution to the spectrum in the region of the phonon energies for S − c − N point-contacts shows up in the form of differential resistance peaks in the first derivative of the excess current, shifted toward lower energies by an amount on the order of the gap, while for S − c − S contacts there is no shift, i.e., these differences are minimal at low temperatures.…”
Section: Introduction a Basic Theoretical Conceptsmentioning
confidence: 93%
“…The electron relaxation upon interaction with other groups of quasiparticles leads to the manifestation of the energy parameters of this interaction in the electrical characteristics of the point contacts. Due to this phenomenon, the spectrum of the electron–phonon interaction in metals [ 5 ], superconductors [ 8 , 61 ], and even in more complex compounds such as organic conductors [ 62 ] can be easily obtained. The point-contact spectrum of the electron–phonon interaction contains the information about the characteristic parameters of the phonon system of a material, which is difficult or even impossible to obtain using other methods.…”
Section: Resultsmentioning
confidence: 99%
“…The latter normally behave as bulk conductors of electric current without spectral properties. In contrast, Yanson point contacts display quantum properties that enable the direct measurement of the interaction between electrons and various quasiparticles, such as phonons or magnons [ 5 6 ], the observation of the spectral aspects of processes occurring in the superconducting state [ 7 – 8 ], and the extraction of spectral information from the electric noise [ 9 ]. Similar advantages arise in sensor studies.…”
Section: Introductionmentioning
confidence: 99%
“…This nonlinearity can also be used for the recovery of the EPI function. The appropriate theories that allow this to be done for S-c-N and S-c-S contacts (S is superconductor, N is normal metal, c is constriction) appeared in 1983 [5,6]; however, practical attempts to recover the EPI function from the superconducting characteristics of these contacts were made relatively recently [7][8][9].…”
Section: Introductionmentioning
confidence: 99%