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Michon, B; Girod, C; Badoux, S; Kačmarčík, J; Ma, Q; Dragomir, M; Dabkowska, H A; Gaulin, B D; Zhou, J-S; Pyon, S; Takayama, T; Takagi, H; Verret, S; Doiron-Leyraud, N; Marcenat, C; Taillefer, L; Klein, T
Nature (London), 03/2019, Letnik: 567, Številka: 7747Journal Article
The three central phenomena of cuprate (copper oxide) superconductors are linked by a common doping level p*-at which the enigmatic pseudogap phase ends and the resistivity exhibits an anomalous linear dependence on temperature, and around which the superconducting phase forms a dome-shaped area in the phase diagram . However, the fundamental nature of p* remains unclear, in particular regarding whether it marks a true quantum phase transition. Here we measure the specific heat C of the cuprates Eu-LSCO and Nd-LSCO at low temperature in magnetic fields large enough to suppress superconductivity, over a wide doping range that includes p*. As a function of doping, we find that C /T is strongly peaked at p* (where C is the electronic contribution to C) and exhibits a log(1/T) dependence as temperature T tends to zero. These are the classic thermodynamic signatures of a quantum critical point , as observed in heavy-fermion and iron-based superconductors at the point where their antiferromagnetic phase comes to an end. We conclude that the pseudogap phase of cuprates ends at a quantum critical point, the associated fluctuations of which are probably involved in d-wave pairing and the anomalous scattering of charge carriers.
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