Effect of ion irradiation on superconducting thin films

Katja Kohopää; Alberto Ronzani; Robab Najafi Jabdaraghi; Arijit Bera; Mário Ribeiro; Dibyendu Hazra; Jorden Senior; Mika Prunnila; Joonas Govenius; Janne S. Lehtinen; Antti Kemppinen

doi:10.1063/5.0202851

Effect of ion irradiation on superconducting thin films

Katja Kohopää^*
, Alberto Ronzani
, Robab Najafi Jabdaraghi
, Arijit Bera
, Mário Ribeiro
, Dibyendu Hazra
, Jorden Senior
, Mika Prunnila
, Joonas Govenius
, Janne S. Lehtinen
, Antti Kemppinen

^*Corresponding author for this work

Institute of Science and Technology Austria (ISTA)

Research output: Contribution to journal › Article › Scientific › peer-review

7 Citations (Scopus)

123 Downloads (Pure)

Abstract

We demonstrate ion irradiation by argon or gallium as a wafer-scale post-processing method to increase disorder in superconducting thin films. We study several widely used superconductors, both single-elements and compounds. We show that ion irradiation increases normal-state resistivity in all our films, which is expected to enable tuning their superconducting properties, for example, toward a higher kinetic inductance. We observe an increase in superconducting transition temperature for Al and MoSi and a decrease for Nb, NbN, and TiN. In MoSi, ion irradiation also improves the mixing of the two materials. We demonstrate the fabrication of an amorphous and homogeneous film of MoSi with uniform thickness, which is promising, for example, for superconducting nanowire single-photon detectors.

Original language	English
Article number	071101
Journal	APL Materials
Volume	12
Issue number	7
DOIs	https://doi.org/10.1063/5.0202851
Publication status	Published - 1 Jul 2024
MoE publication type	A1 Journal article-refereed

Funding

We thank J. A. Sauls for useful discussions. For funding of our research project, we acknowledge the European Union\u2019s Horizon 2020 Research and Innovation Program under Grant Agreement Nos. 862660/Quantum e-leaps, 899558/aCryComm, 766853/EFINED, and ECSEL programme 101007322/MatQu. This project has also received funding from Business Finland through Quantum Technologies Industrial (QuTI) Project No. 128291 and from Research Council of Finland through Grant Nos. 310909, 350220 and Finnish Quantum Flagship project 359284. This work was performed as part of the Research Council of Finland Centres of Excellence program (Project Nos. 336817, 336819, 352934, and 352935). We also acknowledge funding from an internal strategic innovation project of VTT related to the development of quantum computing technologies. This research was supported by the Scientific Service Units of IST Austria through resources provided by Electron Microscopy Facility. J. Senior acknowledges funding from the European Union\u2019s Horizon 2020 Research and Innovation Program under the Marie Sk\u0142odowska-Curie Grant Agreement No. 754411. A. Ronzani acknowledges funding from Research Council of Finland (Research Fellowship Project No. 356542).

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5.0202851Final published version, 8.97 MBLicence: CC BY

Cite this

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title = "Effect of ion irradiation on superconducting thin films",

abstract = "We demonstrate ion irradiation by argon or gallium as a wafer-scale post-processing method to increase disorder in superconducting thin films. We study several widely used superconductors, both single-elements and compounds. We show that ion irradiation increases normal-state resistivity in all our films, which is expected to enable tuning their superconducting properties, for example, toward a higher kinetic inductance. We observe an increase in superconducting transition temperature for Al and MoSi and a decrease for Nb, NbN, and TiN. In MoSi, ion irradiation also improves the mixing of the two materials. We demonstrate the fabrication of an amorphous and homogeneous film of MoSi with uniform thickness, which is promising, for example, for superconducting nanowire single-photon detectors.",

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AU - Kohopää, Katja

AU - Ronzani, Alberto

AU - Jabdaraghi, Robab Najafi

AU - Bera, Arijit

AU - Ribeiro, Mário

AU - Hazra, Dibyendu

AU - Senior, Jorden

AU - Prunnila, Mika

AU - Govenius, Joonas

AU - Lehtinen, Janne S.

AU - Kemppinen, Antti

PY - 2024/7/1

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N2 - We demonstrate ion irradiation by argon or gallium as a wafer-scale post-processing method to increase disorder in superconducting thin films. We study several widely used superconductors, both single-elements and compounds. We show that ion irradiation increases normal-state resistivity in all our films, which is expected to enable tuning their superconducting properties, for example, toward a higher kinetic inductance. We observe an increase in superconducting transition temperature for Al and MoSi and a decrease for Nb, NbN, and TiN. In MoSi, ion irradiation also improves the mixing of the two materials. We demonstrate the fabrication of an amorphous and homogeneous film of MoSi with uniform thickness, which is promising, for example, for superconducting nanowire single-photon detectors.

AB - We demonstrate ion irradiation by argon or gallium as a wafer-scale post-processing method to increase disorder in superconducting thin films. We study several widely used superconductors, both single-elements and compounds. We show that ion irradiation increases normal-state resistivity in all our films, which is expected to enable tuning their superconducting properties, for example, toward a higher kinetic inductance. We observe an increase in superconducting transition temperature for Al and MoSi and a decrease for Nb, NbN, and TiN. In MoSi, ion irradiation also improves the mixing of the two materials. We demonstrate the fabrication of an amorphous and homogeneous film of MoSi with uniform thickness, which is promising, for example, for superconducting nanowire single-photon detectors.

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DO - 10.1063/5.0202851

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Effect of ion irradiation on superconducting thin films

Abstract

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SUPSI: Si-based Josephson field-effect transistors

QuantLearn: Diverse computing ecosystem for quantum machine learning via optical links

aCryComm: attojoule Cryogenic Communication

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Effect of ion irradiation on superconducting thin films

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Projects

SUPSI: Si-based Josephson field-effect transistors

QuantLearn: Diverse computing ecosystem for quantum machine learning via optical links

aCryComm: attojoule Cryogenic Communication

Cite this