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Signatures of the electronic nature of pairing in high-T-c superconductors obtained by non-equilibrium boson spectroscopy
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2013 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 4, 2970- p.Article in journal (Refereed) Published
Abstract [en]

Understanding the pairing mechanism that gives rise to high-temperature superconductivity is one of the longest-standing problems of condensed-matter physics. Almost three decades after its discovery, even the question of whether or not phonons are involved remains a point of contention to some. Here we describe a technique for determining the spectra of bosons generated during the formation of Cooper pairs on recombination of hot electrons as they tunnel between the layers of a cuprate superconductor. The results obtained indicate that the bosons that mediate pairing decay over micrometre-scale distances and picosecond timescales, implying that they propagate at a speed of around 10(6) m s(-1). This value is more than two orders of magnitude greater than the phonon propagation speed but close to Fermi velocity for electrons, suggesting that the pairing mechanism is mediated by unconventional repulsive electron-electron, rather than attractive electron-phonon, interactions.

Place, publisher, year, edition, pages
Nature Publishing Group, 2013. Vol. 4, 2970- p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-100397DOI: 10.1038/ncomms3970ISI: 000329397600006OAI: oai:DiVA.org:su-100397DiVA: diva2:693073
Funder
Swedish Research Council
Note

AuthorCount:3;

Available from: 2014-02-03 Created: 2014-02-03 Last updated: 2017-12-06Bibliographically approved

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Krasnov, Vladimir M.Katterwe, Sven-OlofRydh, Andreas
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