Temperature-dependent transport characteristics of quasiballistic normal-metal–superconductor junctions

Belogolovskii, Mikhail; Grajcar, M.; Seidel, P.

doi:10.1103/physrevb.61.3259

Cited by 5 publications

(1 citation statement)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Together with the overall increase expected from the conventional tunneling theory [4] the junction resistance also displays a minimum below T c . As was shown in the paper [5], such a feature appears in conductance spectra of N-I-S heterostructures for moderate values of the insulating region transparency (the standard theory of tunneling processes [4] assumes the presence of very high potential barriers).…”

Section: Received February 11 2002mentioning

confidence: 88%

Inelastic electron tunneling across magnetically active interfaces in cuprate and manganite heterostructures modified by electromigration processes

Belogolovskii

Revenko

Gerasimenko

et al. 2002

Low Temperature Physics

View full text Add to dashboard Cite

We report a study of the electron tunneling transport in point-contact junctions formed by a sharp Ag tip and two different highly correlated oxides, namely, a magnetoresistive manganite La 0.66 Ca 0.34 MnO 3 and a superconducting cuprate LaBa 2 Cu 3 O 7-x . Strong chemical modifications of the oxide surface (supposedly, oxygen ion displacements) caused by applying high voltages to the junctions have been observed. This effect is believed to be responsible for an enormous growth of inelastic tunneling processes across a transition region that reveals itself in an overall «V»-shaped conductance background, with a strong temperature impact. The mechanism of the inelastic scattering is ascribed to charge transmission across magnetically active interfaces between two electrodes forming the junction. To support the latter statement, we have fabricated planar junctions between Cr and Ag films with an antiferromagnetic chromium oxide Cr 2 O 3 as a potential barrier and at high-bias voltages have found an identical conductance trend with a similar temperature effect.

show abstract

Section: Received February 11 2002mentioning

confidence: 88%

Inelastic electron tunneling across magnetically active interfaces in cuprate and manganite heterostructures modified by electromigration processes

Belogolovskii

Revenko

Gerasimenko

et al. 2002

Low Temperature Physics

View full text Add to dashboard Cite

show abstract

Quasiparticle current and phase locking of intrinsic Josephson junctions

Seidel

Grib

Shukrinov

et al. 2001

Physica C: Superconductivity

View full text Add to dashboard Cite

Tunnelling effects on surface bound states in unconventional superconductors

Kashiwaya¹,

2000

View full text Add to dashboard Cite

Recent studies on high-T c superconductors have aroused new interest in tunnelling effects in unconventional superconductors. Unlike in conventional s-wave superconductors, the d-wave pairing state in these materials has an internal phase of the pair potential. The internal phase as a function of the wavevector of the Cooper pairs has a large influence on the electric properties of tunnelling junctions. Important effects of the internal phase on the Josephson current were first predicted theoretically. The idea has been established through several experiments using high-T c Josephson junctions, which detect π -phase shift between the aand b-axis directions and fractional flux quanta. These results give convincing evidence for d-wave symmetry in high-T c superconductors. In addition, the existence of new interference effects in the quasiparticle states near surfaces and boundaries has been suggested through theoretical predictions. Experimentally, a large number of tunnelling spectroscopy data showed zero-bias conductance peaks (ZBCPs), the origin of which cannot be explained in terms of the classical concept that a tunnelling conductance spectrum is a phase-insensitive probe of the electronic states. It is clarified theoretically that the observed ZBCPs reflect the formation of zeroenergy states on the surface due to the π -phase shift of internal phase in the d-wave pairing symmetry. The formulation developed for tunnelling spectroscopy suggests that tunnelling spectroscopy is essentially phase sensitive. In addition, the formation of the bound states has been shown to have a serious influence on the electrical properties of Josephson junctions. Several anomalous properties including strong enhancement of the Josephson current in the low-temperature region have been predicted theoretically. In this report, recent developments in tunnelling effects on surface bound states in unconventional superconductors are reviewed.

show abstract

Temperature-dependent transport characteristics of quasiballistic normal-metal–superconductor junctions

Cited by 5 publications

References 29 publications

Inelastic electron tunneling across magnetically active interfaces in cuprate and manganite heterostructures modified by electromigration processes

Inelastic electron tunneling across magnetically active interfaces in cuprate and manganite heterostructures modified by electromigration processes

Quasiparticle current and phase locking of intrinsic Josephson junctions

Tunnelling effects on surface bound states in unconventional superconductors

Contact Info

Product

Resources

About