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Quantum cascades in nano-engineered superconductors: geometrical, thermal and paramagnetic effects
| hal.structure.identifier | Departement Fysica | |
| dc.contributor.author | CHEN, Yajiang | |
| hal.structure.identifier | Departement Fysica | |
| dc.contributor.author | SHANENKO, A. A. | |
| hal.structure.identifier | Laboratoire Ondes et Matière d'Aquitaine [LOMA] | |
| dc.contributor.author | CROITORU, Mihail D. | |
| hal.structure.identifier | Departement Fysica | |
| dc.contributor.author | PEETERS, F. M. | |
| dc.date.issued | 2012 | |
| dc.identifier.issn | 0953-8984 | |
| dc.description.abstractEn | The effect of a parallel magnetic field on the orbital motion of electrons in high-quality superconducting nanowires resulting in a superconductor-to-normal transition which occurs through a cascade of jumps in the order parameter as a function of the magnetic field. Such cascades originate from the transverse size quantization that splits the conduction band into a series of subbands. Here, based on a numerical solution of the Bogoliubov-de Gennes equations for a hollow nanocylinder, we investigate how the quantum-size cascades depend on the confining geometry, i.e., by changing the cylinder radius R and its thickness d we cover the range from the nanowire-like to the nanofilm-like regime. The cascades are shown to become much less pronounced when increasing R=d, i.e., when the nanofilm-like regime is approached. When the temperature is non-zero they are thermally smoothed. This includes the spin-magnetic-field interaction which reduces the critical (depairing) parallel magnetic field Hc;k but does not have any qualitative effect on the quantum cascades. From our calculations it is seen that the paramagnetic limiting field Hpar significantly exceeds Hc;k even in extremely narrow nanocylinders, i.e., when R; d are down to a few nanometers, and Hc;k is only about 10% larger when switching-off the spin-magnetic-field interaction in this case. Both characteristic fields, Hc;k and Hpar, exhibit pronounced quantum-size oscillations. We demonstrate that the quantum cascades and the quantum-size oscillations survive in the presence of surface roughness. | |
| dc.language.iso | en | |
| dc.publisher | IOP Publishing | |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-sa/ | |
| dc.title.en | Quantum cascades in nano-engineered superconductors: geometrical, thermal and paramagnetic effects | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1088/0953-8984/24/26/265702 | |
| dc.subject.hal | Physique [physics]/Matière Condensée [cond-mat]/Supraconductivité [cond-mat.supr-con] | |
| dc.description.sponsorshipEurope | Superconductivity in quantum-size regime | |
| bordeaux.journal | Journal of Physics: Condensed Matter | |
| bordeaux.page | 265702 | |
| bordeaux.volume | 24 | |
| bordeaux.issue | 26 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00731851 | |
| hal.version | 1 | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00731851v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Physics:%20Condensed%20Matter&rft.date=2012&rft.volume=24&rft.issue=26&rft.spage=265702&rft.epage=265702&rft.eissn=0953-8984&rft.issn=0953-8984&rft.au=CHEN,%20Yajiang&SHANENKO,%20A.%20A.&CROITORU,%20Mihail%20D.&PEETERS,%20F.%20M.&rft.genre=article |
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