Inhomogeneous response of superconducting tunnel junctions with a killed electrode for X-ray spectroscopy

Berg, M.L. van den; Bruijn, M. P.; Gómez, J.; Kiewiet, F. B.; Korte, P. A. J. de; Lieshout, H. L. van; Luiten, O.J.; Martin, J.; Grand, Johan; Schroeder, Tobias; Huebener, R. P.

doi:10.1109/77.622092

Cited by 21 publications

(7 citation statements)

References 9 publications

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“…A similar discrepancy between predicted and measured diffusion constants in polycrystalline Nb films has also been reported. 20,21 The quasiparticle lifetime we measure is longer than that reported by others. 16 -18 The data previously reported by our group 16 was for a short device with Lϭ200 m, produced prior to the devices reported here.…”

Section: Resultscontrasting

confidence: 45%

Quasiparticle nonequilibrium dynamics in a superconducting Ta film

Frunzio

Wilson

et al. 2003

Journal of Applied Physics

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Nonequilibrium quasiparticle dynamics in Ta are studied using a superconducting Ta film with an Al tunnel junction connected at each end. The quasiparticle system is driven out of the equilibrium by absorption of an x-ray photon. Millions of quasiparticles, created by each photon, diffuse in the Ta film. When the quasiparticles reach the Al junctions they lose energy by emitting phonons and are trapped in the Al film. By measuring the tunneling current, the number of excess quasiparticles can be calculated. In Ta, the diffusion constant of 8.2Ϯ0.2 cm 2 /s and quasiparticle lifetime of 83 Ϯ5 s at 0.21 K are derived from fitting the measured current pulses, and are compared with theoretical predictions.

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Section: Resultscontrasting

confidence: 45%

Quasiparticle nonequilibrium dynamics in a superconducting Ta film

Frunzio

Wilson

et al. 2003

Journal of Applied Physics

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“…Nevertheless, the spatial distributions measured with the LTSEM were explained by a quasiparticle diffusion and edge loss model ͑QD model͒ and found to be consistent with actual x-ray energy spectra. 8,9 A straightforward way for imaging diagnosis is to scan STJ detectors with an x-ray microbeam. There are no reports on x-ray microbeam imaging experiments except for the pinpoint collimation experiments.…”

Section: ͓S0003-6951͑00͒01650-8͔mentioning

confidence: 99%

Experimental imaging diagnosis of superconducting tunnel junction x-ray detectors by low-temperature scanning synchrotron microscope

Preßler¹,

Ohkubo²,

Koike³

et al. 2000

Applied Physics Letters

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Imaging diagnosis of superconducting tunnel junction x-ray detectors has been performed by an apparatus called the low-temperature scanning synchrotron microscope (LTSSM) using an x-ray microbeam with a diameter of 5–10 μm originated from synchrotron radiation. Quasiparallel intense synchrotron radiation enables one to obtain the full two-dimensional images of junctions with dimensions of 200×200 μm2 in about 1 h. The LTSSM results indicate that the standard quasiparticle diffusion and edge loss model for the spatial distribution of the junction response to x rays is evidently inadequate for intermediate or large junctions (with respect to a Josephson penetration depth). On this basis, it is argued that the models proposed for the signal creation and loss mechanism should be reconsidered.

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“…11 Junctions of two different wafers fabricated in a similar way and having comparable multilayer structures ͑Al6/1 and Al6/3͒ were investigated. Figure 2 shows the multilayer structure of two different types of junctions of wafer Al6/1.…”

Section: Methodsmentioning

confidence: 99%

Quasiparticle losses at the surface of superconducting tunnel junction detectors

Panteleit

Schroeder

Martin

et al. 1999

Journal of Applied Physics

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Panteleit, F., Schroeder, T., Martin, J., Huebener, R. P., Kiewiet, F. B., Berg, van den, M. L., & Korte, P. A. J. (1999). Quasiparticle losses at the surface of superconducting tunnel junction detectors. Journal of Applied Physics, 85(1), 565-570. DOI: 10.1063/1.369490 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Superconducting tunnel junctions ͑STJs͒ are promising as high energy resolution x-ray detectors. However, the theoretical limit of the energy resolution of STJs has not yet been reached for several reasons. In many cases quasiparticle losses limit the energy resolution. We have investigated STJs with different multilayer structures by means of low temperature scanning electron microscopy. By measuring the quasiparticle lifetime of Nb junctions with and without Ta passivation at the surface, we have identified quasiparticle losses at the surface of nonpassivated junctions as the dominant loss process. The temperature dependence of the quasiparticle lifetime gives information about the loss mechanism. The influence of quasiparticle traps on the effective quasiparticle lifetime is discussed.

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Inhomogeneous response of superconducting tunnel junctions with a killed electrode for X-ray spectroscopy

Cited by 21 publications

References 9 publications

Quasiparticle nonequilibrium dynamics in a superconducting Ta film

Quasiparticle nonequilibrium dynamics in a superconducting Ta film

Experimental imaging diagnosis of superconducting tunnel junction x-ray detectors by low-temperature scanning synchrotron microscope

Quasiparticle losses at the surface of superconducting tunnel junction detectors

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