Change of carrier density at the pseudogap critical point of a cuprate superconductor

The pseudogap is a partial gap in the electronic density of states that opens in the normal (non-superconducting) state of cuprate superconductors and whose origin is a long-standing puzzle. Its connection to the Mott insulator phase at low doping (hole concentration, p) remains ambiguous and its re...

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Bibliographic Details
Published in:Nature (London) 2016-03, Vol.531 (7593), p.210-214
Main Authors: Badoux, S, Tabis, W, Laliberté, F, Grissonnanche, G, Vignolle, B, Vignolles, D, Béard, J, Bonn, D A, Hardy, W N, Liang, R, Doiron-Leyraud, N, Taillefer, Louis, Proust, Cyril
Format: Article
Language:English
Subjects:
Condensed Matter
Electric charge and distribution
Magnetic fields
Observations
Physics
Properties
Superconductivity
Superconductors
Temperature
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Summary:The pseudogap is a partial gap in the electronic density of states that opens in the normal (non-superconducting) state of cuprate superconductors and whose origin is a long-standing puzzle. Its connection to the Mott insulator phase at low doping (hole concentration, p) remains ambiguous and its relation to the charge order that reconstructs the Fermi surface at intermediate doping is still unclear. Here we use measurements of the Hall coefficient in magnetic fields up to 88 tesla to show that Fermi-surface reconstruction by charge order in the cuprate YBa2Cu3Oy ends sharply at a critical doping p = 0.16 that is distinctly lower than the pseudogap critical point p* = 0.19 (ref. 11). This shows that the pseudogap and charge order are separate phenomena. We find that the change in carrier density n from n = 1 + p in the conventional metal at high doping (ref. 12) to n = p at low doping (ref. 13) starts at the pseudogap critical point. This shows that the pseudogap and the antiferromagnetic Mott insulator are linked.
ISSN:0028-0836
1476-4687
DOI:10.1038/nature16983