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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lang, Wolfgang
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2023Phase purity and surface morphology of high-Jc superconducting Bi2Sr2Ca1Cu2O8+δ thin filmscitations
- 2023Angle-dependent Magnetoresistance of an Ordered Bose Glass of Vortices in YBa2Cu3O7-δ Thin Films with a Periodic Pinning Latticecitations
- 2023Applied Surface Science / Phase purity and surface morphology of high-Jc superconducting Bi2Sr2Ca1Cu2O8+δ thin filmscitations
- 2020Angular magnetic-field dependence of vortex matching in pinning lattices fabricated by focused or masked helium ion beam irradiation of superconducting YBa2Cu3O7-δ thin filmscitations
- 2018Transverse vortex commensurability effect and sign change of the Hall voltage in superconducting YBa2Cu3O7−δ thin films with a nanoscale periodic pinning landscapecitations
- 2017Superconducting order parameter fluctuations in NbN/NiCu and NbTiN/NiCu bilayer nanostripes for photon detectioncitations
- 2015Superconducting and ferromagnetic properties of NbN/NiCu and NbTiN/NiCu bilayer nanostructures for photon detectioncitations
- 2014Strong vortex matching effects in YBCO films with periodic modulations of the superconducting order parameter fabricated by masked ion irradiationcitations
- 2012Ion beam irradiation of cuprate high-temperature superconductors: Systematic modification of the electrical properties and fabrication of nanopatternscitations
- 2012Non-ohmic electrical transport properties above the critical temperature in optimally and underdoped superconducting YBa2Cu3O6+xcitations
- 2010Optically induced changes and long-term relaxations of resistivity and critical temperature in He+ irradiated YBa2Cu3Oxcitations
- 2010Surface planarization and masked ion-beam structuring of YBa2Cu3O7 thin filmscitations
- 2010Modification and nano-patterning of high-Tc superconducting thin films by masked ion beam irradiationcitations
- 2009Masked ion beam irradiation of high-temperature superconductors: patterning of nano-size regions with high point-defect densitycitations
- 2008Photodoping of YBa2Cu3Ox: Dependence on temperature and photon energycitations
- 2006Ion-beam modification of high-temperature superconductor thin films for the fabrication of superconductive nanodevices
- 2006Non-exponential optical modification of the electrical properties in oxygen-deficient YBa2Cu3Ox
- 2006Angle dependence of the Hall effect in HgBa2 CaCu2 O6 thin filmscitations
- 2006Ion-beam direct-structuring of high-temperature superconductorscitations
- 2006Angle-dependence of the Hall effect in Hg-Ba-Ca-Cu-O thin films
- 2004Tailoring the transport properties of YBa2Cu3O7-δ thin films by light-ion irradiation
- 2002Electrical properties, texture, and microstructure of vicinal YBa2Cu3O7-δ thin filmscitations
- 2001Pulsed-laser deposition and characterization of high-temperature superconducting films
- 2000Double sign reversal of the vortex Hall effect in YBa2Cu3O7-δ thin films in the strong pinning limit of low magnetic fieldscitations
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document
Superconducting order parameter fluctuations in NbN/NiCu and NbTiN/NiCu bilayer nanostripes for photon detection
Abstract
Thermodynamic fluctuations of the superconducting order parameter in NbN/NiCu and NbTiN/NiCu superconductor/ferromagnet (S/F) thin bilayers patterned to microbridges are investigated. Plain NbN and NbTiN films served as reference materials for the analyses. The samples were grown using dc-magnetron sputtering on chemically cleaned sapphire single-crystal substrates. After rapid thermal annealing at high temperatures, the superconducting films were coated with NiCu overlays, using co-sputtering. The positive magnetoresistance of the superconducting single layers is very small in the normal state but with a sharp upturn close to the superconducting transition, a familiar signature of superconducting fluctuations. The fluctuation-enhanced conductivity (paraconductivity) of the NbN and NbTiN single layer films is slightly larger than the prediction of the parameter-free Aslamazov-Larkin theory for order-parameter fluctuations in two-dimensional superconductors. The addition of a ferromagnetic top layer, however, changes the magnetotransport properties significantly. The S/F bilayers show a negative magnetoresistance up to almost room temperature, while the signature of fluctuations is similar to that in the plain films, demonstrating the relevance of both ferromagnetic and superconducting effects in the S/F bilayers. The paraconductivity is reduced below theoretical predictions, in particular in the NbTiN/NiCu bilayers. Such suppression of the fluctuation amplitude in S/F bilayers could be favorable to reduce dark counts in superconducting photon detectors and lead the way to enhance their performance.