STM spectroscopy of the local density of states in hybrid normal metal–superconductor bilayers

Crétinon, L.; Gupta, Anjan K.; Pannetier, B.; Courtois, Hervé

doi:10.1016/j.physc.2003.12.021

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…The existence of the minigap has been confirmed experimentally in a variety of the proximity SN systems (see e.g. [5]- [8] and references therein). In the superconductor -ferromagnet (F) bilayers there are additional bulk F-layer parameters which influence on N (ε).…”

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confidence: 86%

Density of states in SF bilayers with arbitrary strength of magnetic scattering

et al. 2006

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We developed the self-consistent method for the calculation of the density of states N (ε) in the SF bilayers. It based on the quasi-classical Usadel equations and takes into account the suppression of superconductivity in the S layer due to the proximity effect with the F metal, as well as existing mechanisms of the spin dependent electron scattering. We demonstrate that the increase of the spin orbit or spin flip electron scattering rates results in completely different transformations of N (ε) at the free F layer interface. The developed formalism has been applied for the interpretation of the available experimental data.

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confidence: 86%

Density of states in SF bilayers with arbitrary strength of magnetic scattering

et al. 2006

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“…Low temperature scanning tunneling microscopy (STM) studies have been carried out studying the gap in the density of states for S/N bilayers of variable thickness. 19 They have also been used to study S islands coated with an N layer 20 or N islands deposited on an S substrate. 21 In both cases the STM measurements were made over lateral or longitudinal in-plane distances less than 20 nm away from the foreign body, much smaller than the relevant in-plane lengths in our system.…”

Section: Laipe Spatial Variation Of Critical Current Density From Ic(...mentioning

confidence: 99%

Proximity effects and nonequilibrium superconductivity in transition-edge sensors

et al. 2011

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We have recently shown that normal-metal/superconductor (N/S) bilayer TESs (superconducting Transition-Edge Sensors) exhibit weak-link behavior. 1 Here we extend our understanding to include TESs with added noise-mitigating normal-metal structures (N structures). We find TESs with added Au structures also exhibit weak-link behavior as evidenced by exponential temperature dependence of the critical current and Josephson-like oscillations of the critical current with applied magnetic field. We explain our results in terms of an effect converse to the longitudinal proximity effect (LoPE) 1 , the lateral inverse proximity effect (LaiPE), for which the order parameter in the N/S bilayer is reduced due to the neighboring N structures. Resistance and critical current measurements are presented as a function of temperature and magnetic field taken on square Mo/Au bilayer TESs with lengths ranging from 8 to 130 µm with and without added N structures. We observe the inverse proximity effect on the bilayer over in-plane distances many tens of microns and find the transition shifts to lower temperatures scale approximately as the inverse square of the inplane N-structure separation distance, without appreciable broadening of the transition width. We also present evidence for nonequilbrium superconductivity and estimate a quasiparticle lifetime of 1.8 × 10 −10 s for the bilayer. The LoPE model is also used to explain the increased conductivity at temperatures above the bilayer's steep resistive transition.

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“…When operating in spectroscopy mode, the STM gives fine atomic-scale details of the local density of states (LDOS) of inhomogeneous superconducting systems. In contrast to conventional tunnel junctions, where transport measurements are taken, the STM gives localized spatial information not averaged out over the extent of the entire sample [2].…”

Section: Introductionmentioning

confidence: 99%

Local density of states and order parameter configurations in layered ferromagnet-superconductor structures

Halterman

Valls

2005

Physica C: Superconductivity

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We analyze the local density of states (LDOS) of heterostructures consisting of alternating ferromagnet, F , and superconductor, S, layers. We consider structures of the SF S and SF SF SF S type, with thin nanometer scale F and S layers, within the ballistic regime. The spin-splitting effects of the ferromagnet and the mutual coupling between the S regions, yield several nontrivial stable and metastable pair amplitude configurations, and we find that the details of the spatial behavior of the pair amplitude govern the calculated electronic spectra. These are reflected in discernible signatures of the LDOS. The roles that the magnetic exchange energy, interface scattering strength, and the Fermi wavevector mismatch each have on the LDOS for the different allowed junction configurations, are systematically investigated.

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STM spectroscopy of the local density of states in hybrid normal metal–superconductor bilayers

Cited by 3 publications

References 19 publications

Density of states in SF bilayers with arbitrary strength of magnetic scattering

Density of states in SF bilayers with arbitrary strength of magnetic scattering

Proximity effects and nonequilibrium superconductivity in transition-edge sensors

Local density of states and order parameter configurations in layered ferromagnet-superconductor structures

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