165 research outputs found

    Superconducting properties of mesoscopic cylinders with enhanced surface superconductivity

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    The superconducting state of an infinitely long superconducting cylinder surrounded by a medium which enhances its superconductivity near the boundary is studied within the nonlinear Ginzburg-Landau theory. This enhancement can be due to the proximity of another superconductor or due to surface treatment. Quantities like the free energy, the magnetization and the Cooper-pair density are calculated. Phase diagrams are obtained to investigate how the critical field and the critical temperature depend on this surface enhancement for different values of the Ginzburg-Landau parameter \kappa. Increasing the superconductivity near the surface leads to higher critical fields and critical temperatures. For small cylinder diameters only giant vortex states nucleate, while for larger cylinders multivortices can nucleate. The stability of these multivortex states also depends on the surface enhancement. For type-I superconductors we found the remarkable result that for a range of values of the surface extrapolation length the superconductor can transit from the Meissner state into superconducting states with vorticity L > 1. Such a behaviour is not found for the case of large \kappa, i.e. type-II superconductivity.Comment: submitted to Phys. Rev.

    Vortex states in superconducting rings

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    The superconducting state of a thin superconducting disk with a hole is studied within the non-linear Ginzburg-Landau theory in which the demagnetization effect is accurately taken into account. We find that the flux through the hole is not quantized, the superconducting state is stabilized with increasing size of the hole for fixed radius of the disk, and a transition to a multi-vortex state is found if the disk is sufficiently large. Breaking the circular summetry through a non central location of the hole in the disk enhances the multi-vortex state.Comment: 11 pages, 23 figures (postscript). To appear in Physical Review B, Vol. 61 (2000

    Sustainable Luxury Marketing : A synthesis and research agenda

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    Sustainability has become a pervasive issue for the luxury sector, gaining traction with brand managers, scholars, policy-makers, the media, and academia. The purpose of this paper is to examine the state of sustainable luxury research in marketing and consumer behaviour by critically reviewing and synthesizing the growing but fragmented body of scholarly work on sustainable-luxury marketing. The paper critically assesses where, how and by whom research on sustainable luxury is being conducted, and it identifies gaps for future investigation. The paper reviews research published between 2007 and 2018 within major peer-reviewed English-language scholarly publications in business, marketing, ethics, fashion, food and tourism journals. The research is identified using the keywords sustainable luxury, green luxury, eco-luxury and organic luxury. Three core themes emerge from this review: (1) consumer concerns and practices; (2) organizational concerns and practices; and (3) international and cross-cultural issues. The review confirms that research on sustainable luxury is significantly underdeveloped. This paper provides the first critical and comprehensive assessment and categorization of the emergent literature streams on sustainable luxury. The authors argue for a broader, deeper and more critical research agenda on the relationship between sustainability and luxury. Potential avenues for future research on sustainable luxury are proposed, with calls for theoretical and cross-cultural reflections that tackle broader systemic and institutional issues within the field

    Measurements of differential production cross sections for a Z boson in association with jets in pp collisions at root s=8 TeV

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    Search for leptophobic Z ' bosons decaying into four-lepton final states in proton-proton collisions at root s=8 TeV

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    Search for black holes and other new phenomena in high-multiplicity final states in proton-proton collisions at root s=13 TeV

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    Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search

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    Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

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