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Title: Controlling T c of Iridium films using interfacial proximity effects

Abstract

High precision calorimetry using superconducting transition edge sensors requires the use of superconducting films with a suitable T c, depending on the application. To advance high-precision macrocalorimetry, we require low-T c films that are easy to fabricate. A simple and effective way to suppress T c of superconducting Iridium through the proximity effect is demonstrated by using Ir/Pt bilayers as well as Au/Ir/Au trilayers. While Ir/Au films fabricated by applying heat to the substrate during Ir deposition have been used in the past for superconducting sensors, we present results of T c suppression on Iridium by deposition at room temperature in Au/Ir/Au trilayers and Ir/Pt bilayers in the range of $$\sim$$20-100~mK. Measurements of the relative impedance between the Ir/Pt bilayers and Au/Ir/Au trilayers fabricated show factor of $$\sim$$10 higher values in the Ir/Pt case. These new films could play a key role in the development of scalable superconducting transition edge sensors that require low-T c films to minimize heat capacity and maximize energy resolution, while keeping high-yield fabrication methods.

Authors:
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Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1456992
DOE Contract Number:
AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: arXiv.org Repository; Journal Volume: 2017; Related Information: https://arxiv.org/abs/1711.03648
Country of Publication:
United States
Language:
English

Citation Formats

Hennings-Yeomans, R, Chang, CL, Ding, J, Drobizhev, A, Fujikawa, BK, Han, S, Karapetrov, G, Kolomensky, YG, Novosad, V, O'Donnell, T, Ouellet, JL, Pearson, J, Polakovic, T, Reggio, D, Schmidt, B, Sheff, B, Smith, RJ, Wang, G, Welliver, B, and Yefremenko, VG. Controlling Tc of Iridium films using interfacial proximity effects. United States: N. p., 2018. Web.
Hennings-Yeomans, R, Chang, CL, Ding, J, Drobizhev, A, Fujikawa, BK, Han, S, Karapetrov, G, Kolomensky, YG, Novosad, V, O'Donnell, T, Ouellet, JL, Pearson, J, Polakovic, T, Reggio, D, Schmidt, B, Sheff, B, Smith, RJ, Wang, G, Welliver, B, & Yefremenko, VG. Controlling Tc of Iridium films using interfacial proximity effects. United States.
Hennings-Yeomans, R, Chang, CL, Ding, J, Drobizhev, A, Fujikawa, BK, Han, S, Karapetrov, G, Kolomensky, YG, Novosad, V, O'Donnell, T, Ouellet, JL, Pearson, J, Polakovic, T, Reggio, D, Schmidt, B, Sheff, B, Smith, RJ, Wang, G, Welliver, B, and Yefremenko, VG. Tue . "Controlling Tc of Iridium films using interfacial proximity effects". United States. doi:.
@article{osti_1456992,
title = {Controlling Tc of Iridium films using interfacial proximity effects},
author = {Hennings-Yeomans, R and Chang, CL and Ding, J and Drobizhev, A and Fujikawa, BK and Han, S and Karapetrov, G and Kolomensky, YG and Novosad, V and O'Donnell, T and Ouellet, JL and Pearson, J and Polakovic, T and Reggio, D and Schmidt, B and Sheff, B and Smith, RJ and Wang, G and Welliver, B and Yefremenko, VG},
abstractNote = {High precision calorimetry using superconducting transition edge sensors requires the use of superconducting films with a suitable Tc, depending on the application. To advance high-precision macrocalorimetry, we require low-Tc films that are easy to fabricate. A simple and effective way to suppress Tc of superconducting Iridium through the proximity effect is demonstrated by using Ir/Pt bilayers as well as Au/Ir/Au trilayers. While Ir/Au films fabricated by applying heat to the substrate during Ir deposition have been used in the past for superconducting sensors, we present results of Tc suppression on Iridium by deposition at room temperature in Au/Ir/Au trilayers and Ir/Pt bilayers in the range of $\sim$20-100~mK. Measurements of the relative impedance between the Ir/Pt bilayers and Au/Ir/Au trilayers fabricated show factor of $\sim$10 higher values in the Ir/Pt case. These new films could play a key role in the development of scalable superconducting transition edge sensors that require low-Tc films to minimize heat capacity and maximize energy resolution, while keeping high-yield fabrication methods.},
doi = {},
journal = {arXiv.org Repository},
number = ,
volume = 2017,
place = {United States},
year = {Tue Jan 02 00:00:00 EST 2018},
month = {Tue Jan 02 00:00:00 EST 2018}
}