Theory of superconducting-quasiparticle interface states

DeWeert, M. J.; Arnold, G.

doi:10.1103/physrevb.39.11307

Cited by 19 publications

(12 citation statements)

References 8 publications

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“…The dimensionless parameter characterizing barrier strength 36 is Z 0 ≡ mH/hk F , where the effective mass, m, is taken to be equal in the F and S regions. In the superconducting region, at x > 0, we assume 6,7,28,36,40 that there is a pair potential…”

Section: Methodsmentioning

confidence: 99%

Tunneling spectroscopy for ferromagnet/superconductor junctions

2000

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In tunneling spectroscopy studies of ferromagnet/superconductor (F/S) junctions, the effects of spin polarization, Fermi wavevector mismatch (FWM) between the F and S regions, and interfacial resistance play a crucial role. We study the low bias conductance spectrum of these junctions, governed by Andreev reflection at the F/S interface. We consider both d-and s-wave superconductors as well as mixed states of the d + is form. We present results for a range of values of the relevant parameters and find that a rich variety of features appears, depending on pairing state and other conditions. We show that in the presence of FWM, spin polarization can enhance Andreev reflection and give rise to a zero bias conductance peak for an s-wave superconductor.74.80. Fp, 74.50+r,

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Section: Methodsmentioning

confidence: 99%

Tunneling spectroscopy for ferromagnet/superconductor junctions

2000

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“…In principle, the pair potential should be determined self-consistently. However, this would greatly complicate the calculations without shedding much light on the exchange-interaction-induced states in the S/F/S case [10,21], which is the main subject of this paper. In the S/N/S case, the validity of our model requires a weak proximity effect in S, as it may be the case at low T and for thin and short barriers.…”

Section: Quasiparticles Green's Functionmentioning

confidence: 99%

“…( 16), one can easily see that ZES can occur for φ = φ gs only. Due to the spin splitting, SPGS may appear [10,11,21]. Analyzing Eq.…”

Section: Densities Of Statesmentioning

confidence: 99%

Quasiparticle energy spectrum in ferromagnetic Josephson weak links

Dobrosavljević-Grujić

Žikić

Radović

2000

Physica C: Superconductivity

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The quasiparticles energy spectrum in clean ferromagnetic weak links between conventional superconductors is calculated. Large peaks in DOS, due to a special case of Andreev reflection at the ferromagnetic barrier, correspond to spin-splitt bound states. Their energies are obtained as a function of the barrier thickness, exchange field strength, and of the macroscopic phase difference $\phi$ at the link, related to the Josephson current. In the ground state, $\phi$ can be 0 or $\pi$, depending on the ferromagnetic barrier influence. Conditions for the appearence of the zero-energy bound states (ZES) and for the spin polarized ground state (SPGS) are obtained analytically. It is shown that ZES appear only outside the weak link ground state.Comment: 11 pages, 6 figure

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“…We now show that the decrease in Tc at Hc is related to an interface MEF, which acts on the superconductivity in PCCO within a distance of ξc(T) of the PCCO/PCMO interface. For H > Hc, the PCMO is magnetically saturated, and so the Cooper pairs in PCCO experience a spatially uniform MEF through an exchange interaction [86][87][88][89] with the electrons in Mn 3d eg 1 band at the interface of PCMO, which introduces a spin splitting in the superconducting DOS and an interface suppression of Tc (see related works in [47,48,50,54,55]). However, around Hc, the magnetization in PCMO is inhomogeneous with magnetic domains pointing in different directions with the domain wall density therefore maximized.…”

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confidence: 99%

Magnetic Exchange Fields and Domain Wall Superconductivity at an All-Oxide Superconductor-Ferromagnet Insulator Interface

et al. 2018

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At a superconductor-ferromagnet (S/F) interface, the F layer can introduce a magnetic exchange field within the S layer, which acts to locally spin split the superconducting density of states. The effect of magnetic exchange fields on superconductivity has been thoroughly explored at S-ferromagnet insulator (S/FI) interfaces for isotropic s-wave S and a thickness that is smaller than the superconducting coherence length. Here we report a magnetic exchange field effect at an all-oxide S/FI interface involving the anisotropic d-wave high temperature superconductor praseodymium cerium copper oxide (PCCO) and the FI praseodymium calcium manganese oxide (PCMO). The magnetic exchange field in PCCO, detected via magnetotransport measurements through the superconducting transition, is localized to the PCCO/PCMO interface with an average magnitude that depends on the presence or absence of magnetic domain walls in PCMO. The results are promising for the development of all-oxide superconducting spintronic devices involving unconventional pairing and high temperature superconductors.

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Theory of superconducting-quasiparticle interface states

Cited by 19 publications

References 8 publications

Tunneling spectroscopy for ferromagnet/superconductor junctions

Tunneling spectroscopy for ferromagnet/superconductor junctions

Quasiparticle energy spectrum in ferromagnetic Josephson weak links

Magnetic Exchange Fields and Domain Wall Superconductivity at an All-Oxide Superconductor-Ferromagnet Insulator Interface

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