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Angular momentum blockade in nanoscale high-T-c superconducting grains
KTH, School of Engineering Sciences (SCI), Theoretical Physics. KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0002-4024-2704
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.ORCID iD: 0000-0003-1164-0831
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.ORCID iD: 0000-0002-2076-5911
2013 (English)In: Superconductors Science and Technology, ISSN 0953-2048, E-ISSN 1361-6668, Vol. 26, no 12Article in journal (Refereed) Published
Abstract [en]

We discuss the angular momentum blockade in small d-wave superconducting grains in an external field. We find that abrupt changes in the angular momentum state of the condensate, angular momentum blockade, occur as a result of changes in the angular momentum of the condensate in an external magnetic field. The effect represents a direct analogy with the Coulomb blockade. We use the Ginzburg-Landau formalism to illustrate how a magnetic field induces a deviation from the d-wave symmetry which is described by a (d(x2-y2)+id(xy))-order parameter. We derive the behavior of the volume magnetic susceptibility as a function of the magnetic field, and corresponding magnetization jumps at critical values of the field that should be experimentally observable in superconducting grains.

Place, publisher, year, edition, pages
2013. Vol. 26, no 12
Keyword [en]
Angular momentum state, Critical value, External fields, External magnetic field, Ginzburg-Landau formalism, Magnetization jump, Order parameter, Superconducting grains
National Category
Other Physics Topics
URN: urn:nbn:se:kth:diva-138360DOI: 10.1088/0953-2048/26/12/125014ISI: 000327447200017ScopusID: 2-s2.0-84888372894OAI: diva2:684111
Swedish Research Council, VR 621-2012-298 VR 621-2012-3984EU, European Research Council

QC 20140107

Available from: 2014-01-07 Created: 2013-12-19 Last updated: 2014-01-22Bibliographically approved

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Mancarella, FrancescoWallin, MatsRosengren, Anders
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