Spin-polarized quasiparticle injection devices using Au/YBa2Cu3O7/LaAlO3/Nd0.7Sr0.3MnO3 heterostructures

Dong, Z. W.; Ramesh, R.; Venkatesan, T.; Johnson, Mark; Chen, Z. Y.; Pai, S. P.; Talyansky, V.; Sharma, Rohit; Shreekala, R.; Lobb, C.J.; Greene, R. L.

doi:10.1063/1.120014

Cited by 165 publications

(81 citation statements)

References 16 publications

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“…In an earlier theoretical work, 5 this effect was studied in the zero-bias limit. Several recent spin injection experiments [6][7][8][9] have been done with high-T c superconductors. Common to both ferromagnetconventional and high-T c superconductor junctions, the subgap conductance at a given bias is suppressed due to the suppression of AR by the spin splitting of energy band in the ferromagnet.…”

Section: Introductionmentioning

confidence: 99%

Proximity effect, quasiparticle transport, and local magnetic moment in ferromagnet–d-wave-superconductor junctions

Zhu

Ting

2000

Phys. Rev. B

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The proximity effect, quasiparticle transport, and local magnetic moment in ferromagnet-d-wave superconductor junctions with {110}-oriented interface are studied by solving self-consistently the Bogoliubov-de Gennes equations within an extended Hubbard model. It is found that the proximity induced order parameter oscillates in the ferromagnetic region. The modulation period is shortened with the increased exchange field while the oscillation amplitude is depressed by the interfacial scattering. With the determined superconducting energy gap, a transfer matrix method is proposed to compute the subgap conductance within a scattering approach. Many novel features including the zero-bias conductance dip and splitting are exhibited with appropriate values of the exchange field and interfacial scattering strength. The conductance spectrum can be influenced seriously by the spin-flip interfacial scattering. In addition, a sizable local magnetic moment near the {110}-oriented surface of the d-wave superconductor is discussed.

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Section: Introductionmentioning

confidence: 99%

Proximity effect, quasiparticle transport, and local magnetic moment in ferromagnet–d-wave-superconductor junctions

Zhu

Ting

2000

Phys. Rev. B

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“…More recently, experiments were performed by different groups in order to establish whether superconductivity can be suppressed by injecting spinpolarized quasiparticles. [2][3][4] In these cases the combinations existed of a d-wave high-T c superconductor (XBa 2 Cu 3 O 7 , with XϭY, Dy͒ and a fully spin-polarized ferromagnetic manganite (A 0.67 B 0.33 MnO 3 with AϭLa, Nd and BϭCa, Sr͒, either with or without a barrier of a different oxide; measured was the change in the zero-field critical current density J c0 of the superconducting films upon applying a current bias through the ferromagnet. The results are not fully conclusive, and certainly not quantitative.…”

Section: Introductionmentioning

confidence: 99%

Depairing currents in the superconductor/ferromagnet proximity system Nb/Fe

et al. 2001

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We have investigated the behavior of the depairing current J dp in ferromagnet/superconductor/ferromagnet (F/S/F) trilayers as function of the thickness d s of the superconducting layers. Theoretically, J dp depends on the superconducting order parameter or the pair-density function, which is not homogeneous across the film due to the proximity effect. We use a proximity-effect model with two parameters ͑proximity strength and interface transparency͒, which can also describe the dependence of the superconducting transition temperature T c on d s . We compare the computations with the experimentally determined zero-field critical current J c0 of small strips ͑typically 5-m wide͒ of Fe/Nb/Fe trilayers with varying thickness d Nb of the Nb layer. Near T c the temperature dependence J c0 (T) is in good agreement with the expected behavior, which allows extrapolation to Tϭ0. Both the absolute values of J c0 (0) and the dependence on d Nb agree with the expectations for the depairing current. We conclude that J dp is correctly determined, notwithstanding the fact that the strip width is larger than both the superconducting penetration depth and the superconducting coherence length, and that J dp (d s ) is correctly described by the model.

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“…They have shown that the F/S/F double tunnel junction is a magnetoresistive device to control superconductivity by applying the bias voltage or current. The suppression of the superconductivity by the spin injection in the double tunnel junction was observed by Dong et al [16]. In this article, we theoretically study the spindependent transport of the F/S/F SET transistors at zero temperature with a special attention to the parity effect.…”

mentioning

confidence: 99%

Parity effect and tunnel magnetoresistance of ferromagnet/superconductor/ferromagnet single-electron tunneling transistors

2002

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We theoretically study the tunnel magnetoresistance(TMR) of ferromagnet / superconductor / ferromagnet single-electron tunneling transistors with a special attention to the parity effect. It is shown that in the plateau region, there is no spin accumulation in the island even at finite bias voltage. However, the information of the injected spin is carried by the excess electron and thus the TMR exists. The spin relaxation rate of the excess electron can be estimated from the TMR. We also show that the TMR increases with decreasing the size of the superconducting island.

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Spin-polarized quasiparticle injection devices using Au/YBa2Cu3O7/LaAlO3/Nd0.7Sr0.3MnO3 heterostructures

Cited by 165 publications

References 16 publications

Proximity effect, quasiparticle transport, and local magnetic moment in ferromagnet–d-wave-superconductor junctions

Proximity effect, quasiparticle transport, and local magnetic moment in ferromagnet–d-wave-superconductor junctions

Depairing currents in the superconductor/ferromagnet proximity system Nb/Fe

Parity effect and tunnel magnetoresistance of ferromagnet/superconductor/ferromagnet single-electron tunneling transistors

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