Superconductor Science and Technology, volume 30, issue 8, pages 84010
Characterisation of amorphous molybdenum silicide (MoSi) superconducting thin films and nanowires
Archan Banerjee
1
,
Luke J Baker
1
,
Alastair Doye
2
,
Magnus Nord
2
,
Robert M Heath
1
,
Kleanthis Erotokritou
1
,
David Bosworth
3
,
Zoe H. Barber
3
,
Ian Maclaren
4, 5, 6, 7, 8
,
R A HADFIELD
1
4
SUPA school of Physics and Astronomy
6
GLASGOW
|
7
G12 8QQ
8
UK
|
Publication type: Journal Article
Publication date: 2017-07-12
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.6
ISSN: 09532048, 13616668
Materials Chemistry
Metals and Alloys
Ceramics and Composites
Condensed Matter Physics
Electrical and Electronic Engineering
Abstract
We report on the optimisation of amorphous molybdenum silicide thin film growth for
superconducting nanowire single photon detector (SNSPD/SSPD) applications. Molybdenum silicide
was deposited via co-sputtering from Mo and Si targets in an Ar atmosphere. The superconducting
transition temperature (Tc) and sheet resistance (Rs) were measured as a function of thickness and
compared to several theoretical models for disordered superconducting films. Superconducting and
optical properties of amorphous materials are very sensitive to short- (up to 1 nm) and medium-range
order (~1-3 nm) in the atomic structure. Fluctuation electron microscopy (FEM) studies showed that
the films assumed an A15-like medium-range order. Electron energy loss spectroscopy (EELS)
indicates that the film stoichiometry was close to Mo83Si17, which is consistent with reports that many
other A15 structures with the nominal formula A3B show a significant non-stoichiometry with A:B >
3:1. Optical properties from ultraviolet (270 nm) to infrared (2200 nm) wavelengths were measured
via spectroscopic ellipsometry for 5 nm thick MoSi films indicating high long wavelength absorption.
We also measured the current density as a function of temperature for nanowires patterned from a 10
nm thick MoSi film. The current density at 3.6 K is 3.6 x 105A/cm2
for the widest wire studied (2003
nm), falling to 2 x 105A/cm2
for the narrowest (173 nm). This investigation confirms the excellent
suitability of MoSi for SNSPD applications and gives fresh insight into the properties of the
underlying materials.
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1
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Banerjee A. et al. Characterisation of amorphous molybdenum silicide (MoSi) superconducting thin films and nanowires // Superconductor Science and Technology. 2017. Vol. 30. No. 8. p. 84010.
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Banerjee A., Baker L. J., Doye A., Nord M., Heath R. M., Erotokritou K., Bosworth D., Barber Z. H., Maclaren I., HADFIELD R. A. Characterisation of amorphous molybdenum silicide (MoSi) superconducting thin films and nanowires // Superconductor Science and Technology. 2017. Vol. 30. No. 8. p. 84010.
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TY - JOUR
DO - 10.1088/1361-6668/aa76d8
UR - https://doi.org/10.1088/1361-6668/aa76d8
TI - Characterisation of amorphous molybdenum silicide (MoSi) superconducting thin films and nanowires
T2 - Superconductor Science and Technology
AU - Banerjee, Archan
AU - Baker, Luke J
AU - Doye, Alastair
AU - Nord, Magnus
AU - Heath, Robert M
AU - Erotokritou, Kleanthis
AU - Bosworth, David
AU - Barber, Zoe H.
AU - Maclaren, Ian
AU - HADFIELD, R A
PY - 2017
DA - 2017/07/12 00:00:00
PB - IOP Publishing
SP - 84010
IS - 8
VL - 30
SN - 0953-2048
SN - 1361-6668
ER -
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@article{2017_Banerjee,
author = {Archan Banerjee and Luke J Baker and Alastair Doye and Magnus Nord and Robert M Heath and Kleanthis Erotokritou and David Bosworth and Zoe H. Barber and Ian Maclaren and R A HADFIELD},
title = {Characterisation of amorphous molybdenum silicide (MoSi) superconducting thin films and nanowires},
journal = {Superconductor Science and Technology},
year = {2017},
volume = {30},
publisher = {IOP Publishing},
month = {jul},
url = {https://doi.org/10.1088/1361-6668/aa76d8},
number = {8},
pages = {84010},
doi = {10.1088/1361-6668/aa76d8}
}
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Banerjee, Archan, et al. “Characterisation of amorphous molybdenum silicide (MoSi) superconducting thin films and nanowires.” Superconductor Science and Technology, vol. 30, no. 8, Jul. 2017, p. 84010. https://doi.org/10.1088/1361-6668/aa76d8.