Multi-channel Andreev reaction in Co-W nanocontacts fabricated using focused electron/ion beam induced deposition

N. Sharma, P.C.W.G. Vugts, C. Daniels, W. Keuning, J.T. Kohlhepp, O. Kurnosikov, B. Koopmans

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We report multi-channel electron transport in nano-contacts fabricated using focused electron beam induced deposited (FEBID) cobalt and focused ion beam induced deposited (FIBID) tungsten. Anomalous Andreev reflection (AR) effect is observed to which the conventional Blonder–Tinkham–Klapwijk (BTK) fit cannot be applied. In specific, we have observed multiple number of shoulders near the AR peak, whose origin is unknown in literature. We explain this effect based on a simple model that takes into account the material properties of the FIBID grown W superconductor, as well as the specific interface properties that are an outcome of using FEBID/FIBID as a fabrication technique. We show that numerical calculations using the BTK approximation based on the consideration of multiple channels generate similar shoulders as we observed in the AR experiments. Electrical measurements and x-ray photoemission spectroscopy carried out on FIBID W deposits puts additional evidence towards multi-channel current transport occuring at the interface of the nanocontacts.
Originele taal-2Engels
Pagina's (van-tot)495201-
TijdschriftNanotechnology
Volume25
DOI's
StatusGepubliceerd - 2014

Vingerafdruk

Focused ion beams
Ion beams
Electrons
Electron beams
Tungsten
Photoelectron spectroscopy
Cobalt
Superconducting materials
Materials properties
Deposits
Fabrication
X rays
Experiments

Citeer dit

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title = "Multi-channel Andreev reaction in Co-W nanocontacts fabricated using focused electron/ion beam induced deposition",
abstract = "We report multi-channel electron transport in nano-contacts fabricated using focused electron beam induced deposited (FEBID) cobalt and focused ion beam induced deposited (FIBID) tungsten. Anomalous Andreev reflection (AR) effect is observed to which the conventional Blonder–Tinkham–Klapwijk (BTK) fit cannot be applied. In specific, we have observed multiple number of shoulders near the AR peak, whose origin is unknown in literature. We explain this effect based on a simple model that takes into account the material properties of the FIBID grown W superconductor, as well as the specific interface properties that are an outcome of using FEBID/FIBID as a fabrication technique. We show that numerical calculations using the BTK approximation based on the consideration of multiple channels generate similar shoulders as we observed in the AR experiments. Electrical measurements and x-ray photoemission spectroscopy carried out on FIBID W deposits puts additional evidence towards multi-channel current transport occuring at the interface of the nanocontacts.",
author = "N. Sharma and P.C.W.G. Vugts and C. Daniels and W. Keuning and J.T. Kohlhepp and O. Kurnosikov and B. Koopmans",
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Multi-channel Andreev reaction in Co-W nanocontacts fabricated using focused electron/ion beam induced deposition. / Sharma, N.; Vugts, P.C.W.G.; Daniels, C.; Keuning, W.; Kohlhepp, J.T.; Kurnosikov, O.; Koopmans, B.

In: Nanotechnology, Vol. 25, 2014, blz. 495201-.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Multi-channel Andreev reaction in Co-W nanocontacts fabricated using focused electron/ion beam induced deposition

AU - Sharma, N.

AU - Vugts, P.C.W.G.

AU - Daniels, C.

AU - Keuning, W.

AU - Kohlhepp, J.T.

AU - Kurnosikov, O.

AU - Koopmans, B.

PY - 2014

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N2 - We report multi-channel electron transport in nano-contacts fabricated using focused electron beam induced deposited (FEBID) cobalt and focused ion beam induced deposited (FIBID) tungsten. Anomalous Andreev reflection (AR) effect is observed to which the conventional Blonder–Tinkham–Klapwijk (BTK) fit cannot be applied. In specific, we have observed multiple number of shoulders near the AR peak, whose origin is unknown in literature. We explain this effect based on a simple model that takes into account the material properties of the FIBID grown W superconductor, as well as the specific interface properties that are an outcome of using FEBID/FIBID as a fabrication technique. We show that numerical calculations using the BTK approximation based on the consideration of multiple channels generate similar shoulders as we observed in the AR experiments. Electrical measurements and x-ray photoemission spectroscopy carried out on FIBID W deposits puts additional evidence towards multi-channel current transport occuring at the interface of the nanocontacts.

AB - We report multi-channel electron transport in nano-contacts fabricated using focused electron beam induced deposited (FEBID) cobalt and focused ion beam induced deposited (FIBID) tungsten. Anomalous Andreev reflection (AR) effect is observed to which the conventional Blonder–Tinkham–Klapwijk (BTK) fit cannot be applied. In specific, we have observed multiple number of shoulders near the AR peak, whose origin is unknown in literature. We explain this effect based on a simple model that takes into account the material properties of the FIBID grown W superconductor, as well as the specific interface properties that are an outcome of using FEBID/FIBID as a fabrication technique. We show that numerical calculations using the BTK approximation based on the consideration of multiple channels generate similar shoulders as we observed in the AR experiments. Electrical measurements and x-ray photoemission spectroscopy carried out on FIBID W deposits puts additional evidence towards multi-channel current transport occuring at the interface of the nanocontacts.

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