Temperature behavior of electron transport in normal-metal-HTSC heterojunctions

Komissinskii, F. V.; Ovsyannikov, G. A.; Ivanov, Z. G.

doi:10.1134/1.1371355

Cited by 16 publications

(9 citation statements)

References 18 publications

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“…1]. The difference in electronic parameters of Au and CSCO and the surface characteristics of the CSCO/YBCO bilayer determine the potential barrier I b at the Au=CSCO interface and the junction resistance [16]. Thus, our AFM junction can be considered as an S=N=I b =AFM=D structure, where the superconducting order parameter is induced in the normal Au and the AFM CSCO layers by the proximity effect to Nb and YBCO electrodes, respectively [17].…”

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confidence: 99%

Josephson Effect in Hybrid Oxide Heterostructures with an Antiferromagnetic Layer

et al. 2007

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Josephson coupling between an s- and d-wave superconductor through a 50 nm thick Ca1-xSrxCuO2 antiferromagnetic layer was observed for the hybrid Nb/Au/Ca1-xSrxCuO2/YBa2Cu3O7-delta heterostructures and investigated as a function of temperature, magnetic field, and applied millimeter-wave electromagnetic radiation. The magnetic field dependence of the supercurrent I(c)(H) exhibits anomalously rapid oscillations, which is the first experimental evidence of the theoretically predicted giant magneto-oscillations in Josephson junctions with antiferromagnetic interlayers.

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confidence: 99%

Josephson Effect in Hybrid Oxide Heterostructures with an Antiferromagnetic Layer

et al. 2007

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“…The decrease in conductivity σ at low voltages V points to a tunneling character of the current passage through the mesostructure without an LMO layer [25]. Indeed, the averaged (over the quasiparticle momentum direc tion) interface transparencies estimated from R n A by the formula [24,26,27] (5) turn out to be rather low, D = 10 -5 -10 -4 . Here, p F is the minimum Fermi momentum from LSMO and Au at the following parameters: ρ LSMO l LSMO ≈ 10 -10 Ω cm 2 and R n A = 1.5 × 10 -5 Ω cm 2 .…”

Section: Mesostructuresmentioning

confidence: 98%

Spin transport in epitaxial magnetic manganite/ruthenate heterostructures with an LaMnO3 layer

Petrzhik

Ovsyannikov

Shadrin

et al. 2014

J. Exp. Theor. Phys.

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Epitaxial La 0.7 Sr 0.3 MnO 3 /LaMnO 3 /SrRuO 3 (LSMO/LMO/SRO) heterostructures with an LMO layer 0-35 nm thick are grown by laser ablation on an NdGaO 3 substrate at a high temperature. X ray diffraction and transmission electron microscopy demonstrate sharp interfaces and epitaxial growth of the LSMO and SRO layers in the heterostructures at an LMO layer thickness of 0-35 nm. SQUID measurements of the magnetic moment of the heterostructures with an LMO layer and the data obtained with reflectometry of polarized neutrons show that the manganite LMO layer is a ferromagnet at a temperature below 150 K and strongly affects the magnetic moment of the heterostructures at low temperatures. The magnetoresistance of the mesostructure created from the heterostructure using lithography and ion etching decreases with increas ing LMO layer thickness and weakly depends on the direction of an applied magnetic field. If the LMP layer is absent, a negative magnetoresistance is detected; it is likely to be caused by a negative magnetization of the SRO layer.

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“…The Au interlayer in between of Nb and YBCO layers prevents the oxidation of Nb and considerably weaken the oxygen depletion of the SIO/YBCO bilayer. Our investigation of the Nb/YBCO interface (without Au layer between superconductors) reveals much higher values of R⋅A =0.1-1 Ω×cm 2 (A is the in-plane area of MS), and no superconducting current has been observed in Nb/YBCO structures[43]. a) Temperature dependence of the resistance of MS Nb/Au/SIO/YBCO with size 40x40 µm 2 and SIO film thickness d=7nm b) I-V curve and the dependence of differential resistance dV/dI versus I, allowing to estimate the value of critical current I C at T=4.2K, c) I-V curve and dV/dI versus V, which shows singularities caused by the energy gap of the Nb electrode at T=4.2K, d) temperature dependences of the normalized critical current I C and gap voltage V ∆ , where V ∆ (4.3 K) = 0.8 mV.…”

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confidence: 69%

Superconducting current and low-energy states in a mesa-heterostructure interlayered with a strontium iridate film with strong spin-orbit interaction

et al. 2019

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O x with Sr 2 IrO 4 interlayer thickness d=5 and 7 nm and in-plane sizes L=10-50 µm. A strontium iridate, Sr 2 IrO 4 , is known as a canted antiferromagnetic insulator at low temperatures and characterized also by the strong spin-orbit interaction due to the impact of the IrO 2 plane. The superconducting critical current density j C ≈ 0.3 A/cm 2 for the case d=7 nm was observed at T=4.2K. The temperature dependences of the superconducting critical current I C (T) and the voltage position on the I-V curve of the gap singularity of the Nb electrode V ∆ (T) show an increase with decreasing temperature and corresponds to the expected BCS behavior of the Nb energy gap ∆ Nb (T). The critical current is very sensitive to the influence of an external magnetic field and reduces twice at an external magnetic field (H≈0.2 Oe for L=40-50 µm) comparable with the earth magnetic field; The magnetic field dependence I C (H) at low H was narrower than the Fraunhofer pattern about 1.5 times. Both the integer and fractional Shapiro steps at voltages V m,n =(m/n)(h/2e)f e were observed under microwave radiation at frequencies f e =38 GHz and f e =50 GHz. Fractional Shapiro steps (m/n=1/2, 3/2) may point on the presence of the second harmonic in the superconducting current-phase relation.The spin-triplet superconducting pairing induced at the interface of a superconductor and a material with the strong spin-orbit interaction (SOI) gives promising opportunities for superconducting spintronics applications [1][2][3]. It has been shown theoretically, that the SOI in a ferromagnet of the superconductor-ferromagnet-superconductor junction can result in a spintriplet pairing [4][5][6][7]. Rashba proximity states in superconducting tunnel junctions, tuning of a magnetization, the proximity-induced triplet superconductivity, and the anomalous Josephson effect have been predicted as well [8][9][10][11][12][13][14][15][16][17]. Coulomb repulsion and Pauli quenching affect the superconducting current in tunnel junction with SOI interlayer but do not destroy the possibility to tune it by changing the strength of the spin-orbit interaction [18][19][20][21]. So, a lot of very

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Temperature behavior of electron transport in normal-metal-HTSC heterojunctions

Cited by 16 publications

References 18 publications

Josephson Effect in Hybrid Oxide Heterostructures with an Antiferromagnetic Layer

Josephson Effect in Hybrid Oxide Heterostructures with an Antiferromagnetic Layer

Spin transport in epitaxial magnetic manganite/ruthenate heterostructures with an LaMnO3 layer

Superconducting current and low-energy states in a mesa-heterostructure interlayered with a strontium iridate film with strong spin-orbit interaction

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