Enhancement of Superconductivity by Amorphizing Molybdenum Silicide Films Using a Focused Ion Beam

Emma Mykkänen; Arijit Bera; Janne S. Lehtinen; Alberto Ronzani; Katja Kohopää; Teresa Hönigl-decrinis; Rais Shaikhaidarov; Sebastian E. De Graaf; Joonas Govenius; Mika Prunnila

doi:10.3390/nano10050950

Enhancement of Superconductivity by Amorphizing Molybdenum Silicide Films Using a Focused Ion Beam

Emma Mykkänen (Corresponding Author), Arijit Bera, Janne S. Lehtinen, Alberto Ronzani, Katja Kohopää, Teresa Hönigl-decrinis, Rais Shaikhaidarov, Sebastian E. De Graaf, Joonas Govenius, Mika Prunnila

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Abstract

We have used focused ion beam irradiation to progressively cause defects in annealed molybdenum silicide thin films. Without the treatment, the films are superconducting with critical temperature of about 1 K. We observe that both resistivity and critical temperature increase as the ion dose is increased. For resistivity, the increase is almost linear, whereas critical temperature changes abruptly at the smallest doses and then remains almost constant at 4 K. We believe that our results originate from amorphization of the polycrystalline molybdenum silicide films.

Original language	English
Article number	950
Journal	Nanomaterials
Volume	10
Issue number	5
DOIs	https://doi.org/10.3390/nano10050950
Publication status	Published - 16 May 2020
MoE publication type	A1 Journal article-refereed

Keywords

superconductivity
focused ion beam

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10.3390/nano10050950

nano10050950Final published version, 3.39 MB

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@article{c2b60ca77f964ff984058aee26832dec,

title = "Enhancement of Superconductivity by Amorphizing Molybdenum Silicide Films Using a Focused Ion Beam",

abstract = "We have used focused ion beam irradiation to progressively cause defects in annealed molybdenum silicide thin films. Without the treatment, the films are superconducting with critical temperature of about 1 K. We observe that both resistivity and critical temperature increase as the ion dose is increased. For resistivity, the increase is almost linear, whereas critical temperature changes abruptly at the smallest doses and then remains almost constant at 4 K. We believe that our results originate from amorphization of the polycrystalline molybdenum silicide films.",

keywords = "superconductivity, focused ion beam",

author = "Emma Mykk{\"a}nen and Arijit Bera and Lehtinen, {Janne S.} and Alberto Ronzani and Katja Kohop{\"a}{\"a} and Teresa H{\"o}nigl-decrinis and Rais Shaikhaidarov and {De Graaf}, {Sebastian E.} and Joonas Govenius and Mika Prunnila",

note = "Funding: This research was funded by the European Union{\textquoteright}s Horizon 2020 research and innovation programme under grant agreements No 862660 QUANTUM E-LEAPS and No 766853 EFINED, Academy of Finland through projects ETHEC No 322580 and UQS No 310909 and Center of Excellence program No 312294, The UK department of Business, Energy and Industrial Strategy (BEIS) and EPSRC Grant Award EP/R025487/1. This work was carried out as a part of an internal strategic innovation project of VTT related to the development of quantum computing technologies. Publisher Copyright: {\textcopyright} 2020 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

year = "2020",

month = may,

day = "16",

doi = "10.3390/nano10050950",

language = "English",

volume = "10",

journal = "Nanomaterials",

issn = "2079-4991",

publisher = "MDPI",

number = "5",

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TY - JOUR

T1 - Enhancement of Superconductivity by Amorphizing Molybdenum Silicide Films Using a Focused Ion Beam

AU - Mykkänen, Emma

AU - Bera, Arijit

AU - Lehtinen, Janne S.

AU - Ronzani, Alberto

AU - Kohopää, Katja

AU - Hönigl-decrinis, Teresa

AU - Shaikhaidarov, Rais

AU - De Graaf, Sebastian E.

AU - Govenius, Joonas

AU - Prunnila, Mika

N1 - Funding: This research was funded by the European Union’s Horizon 2020 research and innovation programme under grant agreements No 862660 QUANTUM E-LEAPS and No 766853 EFINED, Academy of Finland through projects ETHEC No 322580 and UQS No 310909 and Center of Excellence program No 312294, The UK department of Business, Energy and Industrial Strategy (BEIS) and EPSRC Grant Award EP/R025487/1. This work was carried out as a part of an internal strategic innovation project of VTT related to the development of quantum computing technologies. Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/5/16

Y1 - 2020/5/16

N2 - We have used focused ion beam irradiation to progressively cause defects in annealed molybdenum silicide thin films. Without the treatment, the films are superconducting with critical temperature of about 1 K. We observe that both resistivity and critical temperature increase as the ion dose is increased. For resistivity, the increase is almost linear, whereas critical temperature changes abruptly at the smallest doses and then remains almost constant at 4 K. We believe that our results originate from amorphization of the polycrystalline molybdenum silicide films.

AB - We have used focused ion beam irradiation to progressively cause defects in annealed molybdenum silicide thin films. Without the treatment, the films are superconducting with critical temperature of about 1 K. We observe that both resistivity and critical temperature increase as the ion dose is increased. For resistivity, the increase is almost linear, whereas critical temperature changes abruptly at the smallest doses and then remains almost constant at 4 K. We believe that our results originate from amorphization of the polycrystalline molybdenum silicide films.

KW - superconductivity

KW - focused ion beam

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U2 - 10.3390/nano10050950

DO - 10.3390/nano10050950

M3 - Article

SN - 2079-4991

VL - 10

JO - Nanomaterials

JF - Nanomaterials

IS - 5

M1 - 950

ER -

Enhancement of Superconductivity by Amorphizing Molybdenum Silicide Films Using a Focused Ion Beam

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QUANTUM E-LEAPS: Toward new era of quantum electrical measurements through phase slips

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Enhancement of Superconductivity by Amorphizing Molybdenum Silicide Films Using a Focused Ion Beam

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QUANTUM E-LEAPS: Toward new era of quantum electrical measurements through phase slips

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