Magnetic Quantum Oscillations in YBa2Cu3O6.61 and YBa2Cu3O6.69 in Fields of Up to 85 T: Patching the Hole in the Roof of the Superconducting Dome

John Singleton; Clarina de la Cruz; R. D. McDonald; Shiliang Li; Moaz Altarawneh; Paul Goddard; Isabel Franke; Dwight Rickel; C. H. Mielke; Xin Yao; Pengcheng Dai

doi:10.1103/PhysRevLett.104.086403

Magnetic Quantum Oscillations in YBa2Cu3O6.61 and YBa2Cu3O6.69 in Fields of Up to 85 T: Patching the Hole in the Roof of the Superconducting Dome

John Singleton, Clarina de la Cruz, R. D. McDonald, Shiliang Li, Moaz Altarawneh, Paul Goddard, Isabel Franke, Dwight Rickel, C. H. Mielke, Xin Yao, Pengcheng Dai

DOI 10.1103/PhysRevLett.104.086403 · Physical Review Letters

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Abstract

We measure magnetic quantum oscillations in the underdoped cuprates YBa2Cu3O6+x with x=0.61, 0.69, using fields of up to 85 T. The quantum-oscillation frequencies and effective masses obtained suggest that the Fermi energy in the cuprates has a maximum at hole doping p≈0.11–0.12. On either side, the effective mass may diverge, possibly due to phase transitions associated with the T=0 limit of the metal-insulator crossover (low-p side), and the postulated topological transition from small to large Fermi surface close to optimal doping (high p side).

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6.61 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O6.69 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown