Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102301
Title: Edge effect and significant increase of the superconducting transition onset temperature of 2D superconductors in flat and curved geometries
Authors: Wong, C. H.
Lortz, R.
Issue Date: 2016
Publisher: Elsevier B.V.
Citation: Wong C. H. Edge effect and significant increase of the superconducting transition onset temperature of 2D superconductors in flat and curved geometries / C. H. Wong, R. Lortz. — DOI 10.1016/j.physc.2016.01.004 // Physica C: Superconductivity and its Applications. — 2016. — Vol. 521-522. — P. 50-54.
Abstract: In this paper, we present a simple method to model the curvature activated phonon softening in a 2D superconducting layer. The superconducting transition temperature Tc in the case of a 2D rectangular sheet, a hollow cylinder and a hollow sphere of one coherence length thickness is calculated by the quantum mechanical electron-phonon scattering matrix, and a series of collective lattice vibrations in the surface state. We will show that being extremely thin in a flat rectangular shape is not enough to significantly enhance the Tc through phonon softening. However, if a curvature is added, Tc can be strongly enhanced. The increase in Tc with respect to the bulk is greatest in a hollow sphere, intermediate in a hollow cylinder and weakest for the rectangular sheet, when systems of identical length scale are considered. In addition, we find that the edge effect of such a 2D sheet has a strong broadening effect on Tc in addition to the effect of order parameter phase fluctuations. © 2015 Elsevier B.V. All rights reserved.
Keywords: LOW-DIMENSIONALITY
NANOMATERIALS
PHONON SOFTENING
SUPERCONDUCTORS
COHERENT SCATTERING
CYLINDERS (SHAPES)
LATTICE VIBRATIONS
NANOSTRUCTURED MATERIALS
PHONONS
QUANTUM THEORY
SUPERCONDUCTING MATERIALS
VIBRATIONS (MECHANICAL)
2D SUPERCONDUCTORS
ELECTRON PHONON SCATTERING
LOW DIMENSIONALITY
PHONON SOFTENING
QUANTUM MECHANICAL
RECTANGULAR SHAPES
SUPERCONDUCTING LAYER
SUPERCONDUCTING TRANSITIONS
SUPERCONDUCTING TRANSITION TEMPERATURE
URI: http://hdl.handle.net/10995/102301
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84956866170
PURE ID: 694913
ISSN: 9214534
DOI: 10.1016/j.physc.2016.01.004
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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