Lifshitz critical point in the cuprate superconductor YBa2Cu3Oy from high-field hall effect measurements
- Leboeuf, D.
- Doiron-Leyraud, N.
- Vignolle, Baptiste
- Sutherland, M.
- Ramshaw, B.J.
- Levallois, J.
- Daou, R.
- Laliberté, F.
- Cyr-Choinière, O.
- Chang, J.
- Jo, Y.J.
- Balicas, L.
- Liang, R.
- Bonn, D.A.
- Hardy, W.N.
- Proust, Cyril
- Taillefer, L.
DOIAbstract
International audienceThe Hall coefficient RH of the cuprate superconductor YBa2Cu3Oy was measured in magnetic fields up to 60 T for a hole concentration p from 0.078 to 0.152 in the underdoped regime. In fields large enough to suppress superconductivity, RH(T) is seen to go from positive at high temperature to negative at low temperature, for p>0.08. This change of sign is attributed to the emergence of an electron pocket in the Fermi surface at low temperature. At p<0.08, the normal-state RH(T) remains positive at all temperatures, increasing monotonically as T→0. We attribute the change of behavior across p=0.08 to a Lifshitz transition, namely a change in Fermi-surface topology occurring at a critical concentration pL=0.08, where the el...
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