Vortex-like Current States in Josephson Ballistic Point Contacts

Omelyanchouk, A. N.; Shevchenko, S. N.; Kolesnichenko, Yu. A.

doi:10.1007/s10909-005-3928-x

Cited by 4 publications

(2 citation statements)

References 21 publications

(23 reference statements)

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“…11). However, the Zeeman splitting in a magnetic field of the degenerate spin states leads to a characteristic splitting of the zerobias anomaly into two peaks, and a dip at zero-bias in the contact resistance, with width about 2 g µ B H, in this scenario [12,13]. No such features were observed in a 9 T magnetic field, and therefore we conclude that such a Kondo scattering is not at the origin of the observed anomalies.…”

mentioning

confidence: 68%

Zero-bias anomalies on Sr0.88La0.12CuO2 thin films

Fruchter

Bouquet

2012

Physica C: Superconductivity

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High-impedance contacts made on the surface of Sr0.88La0.12CuO2 superconducting thin films systematically display a zero-bias anomaly. We consider two-level systems (TLS) as the origin of this anomaly. We observe that the contribution of some TLS to the contact resistance is weakened by a magnetic field. We show that this could result from the increase of the TLS relaxation rate in the superconducting state, due to its ability to create pairs of quasiparticles out of the condensate, when located close to the surface of the film.

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mentioning

confidence: 68%

Zero-bias anomalies on Sr0.88La0.12CuO2 thin films

Fruchter

Bouquet

2012

Physica C: Superconductivity

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“…where the first three terms are described above and the last term is given as δI exc (V) ∼ = ( (V)/hω) 2 [18], where ω is the characteristic frequency of phonons mediating the superconducting pairing. This term exceeds the inelastic component of the PC current and the electron-phonon interaction modes mediating superconductivity can be seen in the second derivative d 2 V/dI 2 (V) as peaks not exactly at characteristic EPI energies eV, but, importantly, shifted to higher energies by the value of the superconducting energy gap , in the same way as in the tunneling spectroscopy.…”

Section: Point-contact Spectroscopy Of Strong Coupling Superconductorsmentioning

confidence: 99%

Point-contact spectroscopy of the phononic mechanism of superconductivity in YB₆

Szabó

Girovský

Kačmarčı́k

et al. 2013

Supercond. Sci. Technol.

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Lortz et al. [Phys. Rev. B 73, 024512 (2006)] have utilized specific heat and resistivity measurements as "thermal spectroscopies" to deconvolve the spectrum of the electron-phonon interaction in YB6 assuming a major role of the low frequency phonon mode in mediating superconductivity. Here, we present direct point-contact spectroscopy studies of the superconducting interaction in this system. As a result the normalized superconducting gap reveals a strong coupling with 2∆/kBTc = 4 and moreover the spectra contain nonlinearities typical of the electron-phonon interaction at energies around 8 meV. The in-magnetic-field measurements evidence that the phonon features found in the second derivative of the current-voltage characteristics are due to the energy dependence of the superconducting energy gap as their energy position shrinks equally as the gap is closing. This is a direct proof that the superconducting coupling in the system is due to the low energy Einstein-like phonon mode associated with the yttrium ion vibrations in a perfect agreement with determinations from bulk measurements.

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Conductance characteristics of current-carrying d-wave weak links

Shevchenko

2009

Low Temperature Physics

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The local quasiparticle density of states in the current-carrying d-wave superconducting structures was studied theoretically. The density of states can be accessed through the conductance of the scanning tunnelling microscope. Two particular situations were considered: the current state of the homogeneous film and the weak link between two current-carrying d-wave superconductors.Comment: 4 pages, 3 figures; to appear in Low. Temp. Phy

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Vortex-like Current States in Josephson Ballistic Point Contacts

Cited by 4 publications

References 21 publications

Zero-bias anomalies on Sr0.88La0.12CuO2 thin films

Zero-bias anomalies on Sr0.88La0.12CuO2 thin films

Point-contact spectroscopy of the phononic mechanism of superconductivity in YB₆

Conductance characteristics of current-carrying d-wave weak links

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Vortex-like Current States in Josephson Ballistic Point Contacts

Cited by 4 publications

References 21 publications

Zero-bias anomalies on Sr0.88La0.12CuO2 thin films

Zero-bias anomalies on Sr0.88La0.12CuO2 thin films

Point-contact spectroscopy of the phononic mechanism of superconductivity in YB6

Conductance characteristics of current-carrying d-wave weak links

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Product

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Point-contact spectroscopy of the phononic mechanism of superconductivity in YB₆