Journal
NATURE
Volume 531, Issue 7593, Pages 210-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature16983
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Funding
- LABEX NEXT
- French ANR SUPERFIELD
- EMFL
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canadian Institute for Advanced Research (CIFAR)
- NSERC
- Fonds de recherche du Quebec - Nature et Technologies (FRQNT)
- Canada Foundation for Innovation (CFI)
- Canada Research Chair
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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(1) and its relation to the charge order(2-4) that reconstructs the Fermi surface(5,6) at intermediate doping is still unclear(7-10). Here we use measurements of the Hall coefficient in magnetic fields up to 88 tesla to show that Fermisurface 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.
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