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Asulin, Itay; Sharoni, Amos; Yulli, Ofer; Koren, G.; Millo, Oded

doi:10.1103/physrevlett.93.157001

Cited by 15 publications

(11 citation statements)

References 26 publications

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“…[1,2,3] After submission of this work, we learned of interesting experimental efforts that complement the discussion presented here: (1) In Ref. 31, further evidence of an anomalous proximity effect in the cuprates is presented. These results add to those of Ref.…”

Section: Discussionmentioning

confidence: 81%

Areas of superconductivity and giant proximity effects in underdoped cuprates

et al. 2005

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Phenomenological models for the antiferromagnetic (AF) vs. d-wave superconductivity competition in cuprates are studied using conventional Monte Carlo techniques. The analysis suggests that cuprates may show a variety of different behaviors in the very underdoped regime: local coexistence or first-order transitions among the competing orders, stripes, or glassy states with nanoscale superconducting (SC) puddles. The transition from AF to SC does not seem universal. In particular, the glassy state leads to the possibility of "colossal" effects in some cuprates, analog of those in manganites. Under suitable conditions, non-superconducting Cu-oxides could rapidly become superconducting by the influence of weak perturbations that align the randomly oriented phases of the SC puddles in the mixed state. Consequences of these ideas for thin-film and photoemission experiments are discussed.

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Section: Discussionmentioning

confidence: 81%

Areas of superconductivity and giant proximity effects in underdoped cuprates

et al. 2005

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“…This is the typical situation in a [100] contact between a high T c cuprate and a normal metal while a [110] interface, i.e., an effective d xy rather than a d x 2 −y 2 pair potential, would not generate any proximity effect. [77][78][79] The dip becomes narrower increasing r as long as r < 1. Again there is almost no proximity effect for r = 1 and a ZEP develops for r > 1.…”

Section: A Proximity Effect In Ncs/dnmentioning

confidence: 99%

Proximity effect with noncentrosymmetric superconductors

2012

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We describe the superconducting proximity effect taking place in a contact between a noncentrosymmetric superconductor and a diffusive normal/ferromagnetic metal within the quasiclassical theory of superconductivity. By solving numerically the Usadel equation with boundary conditions valid for arbitrary interface transparency, we show that the analysis of the proximity-modified local density of states in the normal side can be used to obtain information about the exotic superconductivity of noncentrosymmetric materials. We point out the signatures of triplet pairing, the coexistence of triplet and singlet pairing, and particular orbital symmetries of the pair potential. Exploiting the directional dependence of the spin polarization pair breaking effect on the triplet correlations, we show how the order relation between triplet and singlet gaps can be discriminated and that an estimation of the specific gap ratio is possible in some cases.Comment: 11 pages, 4 figure

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“…The predictions concerning the S/F proximity systems result from the singlet pairing in S, and are independent of the symmetry (s-wave or d -wave) of the order parameter 11,12 . However, the anisotropy of the d -wave symmetry is expected to manifest itself in the PE 11 (as in the case of Au/YBCO bilayers we have previously studied 13,14 16,17,18,19,20 . One possible explanation for the long range PE is given by the formation of a strong triplet pairing amplitude component 21,22 .…”

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confidence: 99%

Evidence for crossed Andreev reflections in bilayers of (100)YBa2Cu3O7−δand the itinerant ferromagnet
Asulin
¹
,
Yuli
²
,
Koren
³

et al. 2006
Phys. Rev. B
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Scanning tunneling spectroscopy measurements on thin epitaxial SrRuO3/(100)Y Ba2Cu3O 7−δ ferromagnet/superconductor bilayers, reveal localized regions in which the superconductor order parameter penetrates the ferromagnet to more than 26 nm, an order of magnitude larger than the coherence length in the ferromagnetic layer. These regions consist of narrow (< 10 nm) and long strips, separated by at least 200 nm, consistent with the known magnetic domain wall structure in SrRuO3. We attributed this behavior to Crossed Andreev Reflections, taking place in the vicinity of the magnetic domain walls. PACS numbers: 74.45.+c, 74.50.+r, 74.87.Bz, In spite of a considerable research effort in the past years, a comprehensive understanding of the proximity effect (PE) in superconductor (S) ferromagnet (F) heterostructures has not yet been established. Such systems are of interest since they allow a direct investigation of the interplay between the two competing orders of superconductivity and magnetism. In an N/S proximity system, where N is a normal metal in good electrical contact with S, superconducting correlations are induced in N over a length scale of the normal coherence length, ξ N , while they are weakened in the S side over a scale of the superconducting coherence length, ξ S 1 . The mechanism underlying the PE at S/N interfaces is the Andreev Reflection (AR). Upon impinging on the interface from the N side, hole-like quasiparticles are retro-reflected as electron-like quasiparticles with inverse spin (maintaining phase coherence over ξ N = hD/k B T where D is the diffusion coefficient), while destroying Cooper pairs in the S side. Consequently, the PE is expected to be significantly suppressed when the N side is replaced by a ferromagnet due to spin polarization 2 . Theoretical works based on the Fulde, Ferrell, Larkin and Ovchinnikov (FFLO) mechanism 3,4 , predict a rapid and nonmonotonic decay of the superconducting order parameter (OP) in F, of the form sin(x/ξ F )/(x/ξ F ) in the clean limit and exp(−x/ξ F )cos(x/ξ F ) in the dirty limit (where x is the distance from the interface) 5,6 . The corresponding coherence lengths in F where the exchange energy is E ex , are ξ F =hv F /2E ex (clean limit) and ξ F = (hD/2E ex ) (dirty limit), which are typically of the order of a few nm, much shorter than ξ N . For certain thicknesses of the F layer a 'π-state' may appear, in which the induced OP in F reverses its sign 5,6 . Many studies confirmed these predictions and clearly demonstrated damped OP oscillations in F and a corresponding dependence on the F thickness of the critical current in SFS junctions 7,8 . All of these effects occur on a length scale of a few nm, in agreement with estimates for ξ F . However, other experiments show a long range PE where the penetration depth of the induced order parameter in F is two orders of magnitude larger than ξ F 9,10 . The predictions concerning the S/F proximity systems result from the singlet pairing in S, and are independent of the symmetry (s-wave or d -wave) of the o...

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Anomalous Proximity Effect in Gold Coated (110)YBa2Cu3O7

Cited by 15 publications

References 26 publications

Areas of superconductivity and giant proximity effects in underdoped cuprates

Areas of superconductivity and giant proximity effects in underdoped cuprates

Proximity effect with noncentrosymmetric superconductors

Evidence for crossed Andreev reflections in bilayers of (100)YBa2Cu3O7−δand the itinerant ferromagnet
Asulin
¹
,
Yuli
²
,
Koren
³

et al. 2006
Phys. Rev. B
Self Cite
40
1
40
2
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Anomalous Proximity Effect in Gold Coated (110)YBa2Cu3O7

Cited by 15 publications

References 26 publications

Areas of superconductivity and giant proximity effects in underdoped cuprates

Areas of superconductivity and giant proximity effects in underdoped cuprates

Proximity effect with noncentrosymmetric superconductors

Evidence for crossed Andreev reflections in bilayers of (100)YBa2Cu3O7−δand the itinerant ferromagnetAsulin1, Yuli2, Koren3 et al. 2006Phys. Rev. BSelf Cite401402View full textAdd to dashboardCite

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Evidence for crossed Andreev reflections in bilayers of (100)YBa2Cu3O7−δand the itinerant ferromagnet
Asulin
¹
,
Yuli
²
,
Koren
³

et al. 2006
Phys. Rev. B
Self Cite
40
1
40
2
View full text Add to dashboard Cite