Proximity effect and electron transport in oxide hybrid heterostructures with superconducting/magnetic interfaces

Ovsyannikov, G. A.; Constantinian, K. Y.; Kislinski, Y.V.; Shadrin, A. V.; Av, Zaĭtsev; Petrzhik, A. M.; Демидов, В. В.; Borisenko, I. V.; Kalabukhov, A.; Winkler, Dag

doi:10.1088/0953-2048/24/5/055012

Cited by 6 publications

(2 citation statements)

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“…8 shows the experimental data and theoretical dependences (dotted line) j c (d M ) for three values of normalized exchange field H ex /pk B T in F-layers of the S 0 / I/M/S-structure with an AF-layer (modeled N ¼ 20-the number of F-layers of oppositely directed magnetization), obtained for n AF ¼ 10 nm. 55 Theoretical dependences are shown for the case of low transparency of the M/S--boundary (greater than I-barrier transparency) and identical superconductors S and S 0 . Note that qualitatively the shape of theoretical dependences j c (d M ) does not change even in the case of unequal superconductors.…”

Section: B the Superconducting Current In Hmsmentioning

confidence: 99%

“…5 mV for temperatures T c > T > T c 0 (where T c 0 is the temperature of Nb film) conductivity anomaly with a maximum at V ¼ 0 was observed, caused, most likely, by the Andreev states of low energy. 13,55 When T < T c 0 characteristics were observed in the dependence of the differential resistance of the HMS on voltage R D (V), which were due to the superconducting gap in niobium. It is known 48,58 that the mixed (d-and s-) symmetry of the order parameter of one of the electrodes if the JJ contributes to the second harmonic in the current-phase relationship (CPR).…”

Section: B the Superconducting Current In Hmsmentioning

confidence: 99%

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Josephson effect in cuprate superconducting structures

Ovsyannikov

Constantinian

2012

Low Temperature Physics

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Electron transport and microwave properties of cuprate superconducting structures (bicrystal junctions and hybrid mesa heterostructures) are discussed here. Superconducting current in junctions from cuprate superconductors with the dominant dx2−y2-wave symmetry is determined by the barrier properties, characterized by the mid-gap bound states due to the multiple Andreev reflection. In bicrystal junctions it is revealed via linear dependence of critical current density on square root of the transparency, and an increase of spectral density of shot noise at low voltages are observed. The experiments demonstrate that the superconducting hybrid mesa-heterostructures have the critical current density jс = 1–700 A/cm2 for an antiferromagnetic interlayer with thickness dM = 10–50 nm and the characteristic decay length of superconducting correlations on the order of 7 nm, due to the anomalous long range proximity effect, analyzed in the model of coupled superconductors via multilayer magnetic layer with antiferromagnetic ordering of magnetization in the layers. It is found that the hybrid mesa–heterostructures have much greater sensitivity to external magnetic field than conventional Josephson junctions because of the strong dependence of superconducting current on interlayer spin state.

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Section: B the Superconducting Current In Hmsmentioning

confidence: 99%