Quasiparticle mass enhancement approaching optimal doping in a high-Tc superconductor

See allHide authors and affiliations

Science  26 Mar 2015:
DOI: 10.1126/science.aaa4990

You are currently viewing the abstract.

View Full Text


In the quest for superconductors with higher transition temperatures

(Tc), one emerging motif is that electronic interactions favorable for superconductivity can be enhanced by fluctuations of a broken-symmetry phase. Recent experiments have suggested the existence of the requisite broken symmetry phase in the high-Tc cuprates, but the impact of such a phase on the ground-state electronic interactions has remained unclear. We use magnetic fields exceeding 90 tesla to access the underlying metallic state of the cuprate YBa2Cu3O6+δ over a wide range of doping, and observe magnetic quantum oscillations that reveal a strong enhancement of the quasiparticle effective mass toward optimal doping. This mass enhancement results from increasing electronic interactions approaching optimal doping, and suggests a quantum-critical point at a hole doping of pcrit ≈ 0.18.

View Full Text