Lateral Inverse Proximity Effect in Ti/Au Transition Edge Sensors

K. Nagayoshi; M. de Wit; E. Taralli; S. Visser; M. L. Ridder; L. Gottardi; H. Akamatsu; D. Vaccaro; J. R. Gao; null More Authors

doi:10.1007/s10909-022-02828-3

Lateral Inverse Proximity Effect in Ti/Au Transition Edge Sensors

K. Nagayoshi^*, M. de Wit, E. Taralli, S. Visser, M. L. Ridder, L. Gottardi, H. Akamatsu, D. Vaccaro, J. R. Gao, More Authors

^*Corresponding author for this work

ImPhys/Optics

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Abstract

We report measured T_c of superconducting Ti/Au bilayer strips with a width W varying from 5 to 50 µm. The strips were fabricated based on a Ti/Au bilayer that consists of a 41-nm-thick Ti layer to which a 280-nm-thick Au layer was added. We find that the T_c drops as W decreases and the declining trend almost perfectly follows T_c/ [mK] = - 738.4 [μ m] ²/ W²+ 91.0 , where T_c(W= ∞) of 91 mK is consistent with the intrinsic T_c of the bilayer. The result is interpreted as a consequence of the lateral inverse proximity effect originated in normal-metal microstructures, namely Au overhangs that exist at the edges of the Ti/Au bilayer. The T_c shift from the intrinsic T_c should be anticipated in addition to the longitudinal proximity effect from superconducting Nb leads when one designs Ti/Au TESs.

Original language	English
Pages (from-to)	540-547
Journal	Journal of Low Temperature Physics
Volume	209
Issue number	3-4
DOIs	https://doi.org/10.1007/s10909-022-02828-3
Publication status	Published - 2022

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

Athena
Bilayer
Microcalorimeter
Proximity effect
TES
Ti/Au
X-IFU
X-ray

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10.1007/s10909-022-02828-3

s10909_022_02828_3Final published version, 1.48 MB

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@article{223bdd73fc9147c98b3dffb4c20346ff,

title = "Lateral Inverse Proximity Effect in Ti/Au Transition Edge Sensors",

abstract = "We report measured Tc of superconducting Ti/Au bilayer strips with a width W varying from 5 to 50 µm. The strips were fabricated based on a Ti/Au bilayer that consists of a 41-nm-thick Ti layer to which a 280-nm-thick Au layer was added. We find that the Tc drops as W decreases and the declining trend almost perfectly follows Tc/ [mK] = - 738.4 [μ m] 2/ W2+ 91.0 , where Tc(W= ∞) of 91 mK is consistent with the intrinsic Tc of the bilayer. The result is interpreted as a consequence of the lateral inverse proximity effect originated in normal-metal microstructures, namely Au overhangs that exist at the edges of the Ti/Au bilayer. The Tc shift from the intrinsic Tc should be anticipated in addition to the longitudinal proximity effect from superconducting Nb leads when one designs Ti/Au TESs.",

keywords = "Athena, Bilayer, Microcalorimeter, Proximity effect, TES, Ti/Au, X-IFU, X-ray",

author = "K. Nagayoshi and {de Wit}, M. and E. Taralli and S. Visser and Ridder, {M. L.} and L. Gottardi and H. Akamatsu and D. Vaccaro and Gao, {J. R.} and {More Authors}",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. ",

year = "2022",

doi = "10.1007/s10909-022-02828-3",

language = "English",

volume = "209",

pages = "540--547",

journal = "Journal of Low Temperature Physics",

issn = "0022-2291",

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T1 - Lateral Inverse Proximity Effect in Ti/Au Transition Edge Sensors

AU - Nagayoshi, K.

AU - de Wit, M.

AU - Taralli, E.

AU - Visser, S.

AU - Ridder, M. L.

AU - Gottardi, L.

AU - Akamatsu, H.

AU - Vaccaro, D.

AU - Gao, J. R.

AU - More Authors, null

N1 - Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2022

Y1 - 2022

N2 - We report measured Tc of superconducting Ti/Au bilayer strips with a width W varying from 5 to 50 µm. The strips were fabricated based on a Ti/Au bilayer that consists of a 41-nm-thick Ti layer to which a 280-nm-thick Au layer was added. We find that the Tc drops as W decreases and the declining trend almost perfectly follows Tc/ [mK] = - 738.4 [μ m] 2/ W2+ 91.0 , where Tc(W= ∞) of 91 mK is consistent with the intrinsic Tc of the bilayer. The result is interpreted as a consequence of the lateral inverse proximity effect originated in normal-metal microstructures, namely Au overhangs that exist at the edges of the Ti/Au bilayer. The Tc shift from the intrinsic Tc should be anticipated in addition to the longitudinal proximity effect from superconducting Nb leads when one designs Ti/Au TESs.

AB - We report measured Tc of superconducting Ti/Au bilayer strips with a width W varying from 5 to 50 µm. The strips were fabricated based on a Ti/Au bilayer that consists of a 41-nm-thick Ti layer to which a 280-nm-thick Au layer was added. We find that the Tc drops as W decreases and the declining trend almost perfectly follows Tc/ [mK] = - 738.4 [μ m] 2/ W2+ 91.0 , where Tc(W= ∞) of 91 mK is consistent with the intrinsic Tc of the bilayer. The result is interpreted as a consequence of the lateral inverse proximity effect originated in normal-metal microstructures, namely Au overhangs that exist at the edges of the Ti/Au bilayer. The Tc shift from the intrinsic Tc should be anticipated in addition to the longitudinal proximity effect from superconducting Nb leads when one designs Ti/Au TESs.

KW - Athena

KW - Bilayer

KW - Microcalorimeter

KW - Proximity effect

KW - TES

KW - Ti/Au

KW - X-IFU

KW - X-ray

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DO - 10.1007/s10909-022-02828-3

M3 - Article

AN - SCOPUS:85136149753

SN - 0022-2291

VL - 209

SP - 540

EP - 547

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 3-4

ER -

Lateral Inverse Proximity Effect in Ti/Au Transition Edge Sensors

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Keywords

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