Change search
ReferencesLink to record
Permanent link

Direct link
Superconducting condensate residing on small Fermi pockets in underdoped cuprates
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 1
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 22, 224508Article in journal (Refereed) Published
Abstract [en]

How does Fermi surface develop upon doping of cuprates, does it consist of large barrels or small pockets, which of them is responsible for superconductivity, and what is a role of the pseudogap? Those are actively debated questions, important for understanding of high temperature superconductivity. We study doping dependence of intrinsic tunneling in Bi2Sr2Ca1-x YxCu2O8+delta cuprates, which allows independent analysis of Cooper pair and quasiparticle transport. We observe that with decreasing doping the supercurrent is rapidly decreasing at a rate much faster than the doping level, but the quasiparticle resistance at a sufficiently high bias remains almost doping independent. This remarkable discrepancy indicates that Cooper pairs and quasiparticles are originating from different parts of the Brillouin zone: Cooper pairs are residing on small pockets, which are progressively shrinking with decreasing doping, but the majority of the quasiparticle current is integrated over large barrels, which are only weakly doping dependent. The expanding pseudogap areas along the barrels do not contribute to pair current. This provides direct evidence for nonsuperconducting origin of the pseudogap. We present numerical calculations, taking into account Fermi surface topology, that support our conclusions.

Place, publisher, year, edition, pages
2015. Vol. 91, no 22, 224508
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-118957DOI: 10.1103/PhysRevB.91.224508ISI: 000356215200002OAI: diva2:842769
Available from: 2015-07-22 Created: 2015-07-21 Last updated: 2015-07-22Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Krasnov, Vladimir M.
By organisation
Department of Physics
In the same journal
Physical Review B. Condensed Matter and Materials Physics
Physical 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: 22 hits
ReferencesLink to record
Permanent link

Direct link