College of Science (UPD)

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College of Science

The research outputs, creative works, faculty researcher profiles, and funded projects of the College of Science of the University of the Philippines Diliman. This community brings together scholarly and artistic contributions from its academic departments within the SURI research repository.

Academic Units

  • Institute of Biology
  • Institute of Chemistry
  • Institute of Environmental Science and Meteorology
  • Institute of Mathematics
  • Marine Science Institute
  • Materials Science and Engineering Program
  • National Institute of Geological Sciences
  • National Institute of Molecular Biology and Biotechnology
  • National Institute of Physics

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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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