Change search
ReferencesLink to record
Permanent link

Direct link
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, 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
URN: urn:nbn:se:su:diva-100397DOI: 10.1038/ncomms3970ISI: 000329397600006OAI: diva2:693073
Swedish Research Council


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

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Krasnov, Vladimir M.Katterwe, Sven-OlofRydh, Andreas
By organisation
Department of Physics
In the same journal
Nature Communications
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 27 hits
ReferencesLink to record
Permanent link

Direct link