University of the Philippines Diliman (UP Diliman)

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UP Diliman

The research outputs, funded projects, and researcher profiles of the University of the Philippines Diliman, indexed under SURI and linked to the wider UP System record. Outputs are organized by academic unit, from proposal-stage grants through published, citable works.

RESEARCH OUTPUTS

Publications

Journal articles, theses, conference papers, and technical reports from UP Diliman academic units.

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PEOPLE

Researcher Profiles

Living CVs for UP Diliman faculty and researchers, linked to ORCID and verified research outputs.

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FUNDING

Grants & Projects

Funded research from proposal to publication, with funder, timeline, and project metadata.

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News

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Author: search.filters.author.Allan, Milan P.

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    Item type:Publication,
    Puddle formation, persistent gaps, and non-mean-field breakdown of superconductivity in overdoped (Pb,Bi)2Sr2CuO6+δ
    (arXiv, 2022)
    Tromp, Willem O.
    ;
    Benschop, Tjerk
    ;
    Ge, Jian-Feng
    ;
    Battisti, Irene
    ;
    Bastiaans, Koen M.
    The cuprate high-temperature superconductors exhibit many unexplained electronic phases, but it was often thought that the superconductivity at sufficiently high doping is governed by conventional mean-field Bardeen-Cooper-Schrieffer (BCS) theory[1]. However, recent measurements show that the number of paired electrons (the superfluid density) vanishes when the transition temperature Tc goes to zero[2], in contradiction to expectation from BCS theory. The origin of this anomalous vanishing is unknown. Our scanning tunneling spectroscopy measurements in the overdoped regime of the (Pb,Bi)2Sr2CuO6+δ high-temperature superconductor show that it is due to the emergence of puddled superconductivity, featuring nanoscale superconducting islands in a metallic matrix[3,4]. Our measurements further reveal that this puddling is driven by gap filling, while the gap itself persists beyond the breakdown of superconductivity. The important implication is that it is not a diminishing pairing interaction that causes the breakdown of superconductivity. Unexpectedly, the measured gap-to-filling correlation also reveals that pair-breaking by disorder does not play a dominant role and that the mechanism of superconductivity in overdoped cuprate superconductors is qualitatively different from conventional mean-field theory.

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