Metal-insulator quantum critical point beneath the high Tc superconducting dome

Details Metal-insulator quantum critical point beneath the high Tc superconducting dome Metal-insulator quantum critical point beneath the high Tc superconducting dome

2009-10-13

arxiv.org/abs/0910.2359v1

PNAS 107, 6175 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 8 figures

Scientific paper

10.1073/pnas.0913711107

An enduring question in correlated systems concerns whether superconductivity is favoured at a quantum critical point (QCP) characterised by a divergent quasiparticle effective mass. Despite such a scenario being widely postulated in high Tc cuprates and invoked to explain non-Fermi liquid transport signatures, experimental evidence is lacking for a critical divergence under the superconducting dome. We use ultra-strong magnetic fields to measure quantum oscillations in underdoped YBa2Cu3O6+x, revealing a dramatic doping-dependent upturn in quasiparticle effective mass at a critical metal-insulator transition beneath the superconducting dome. Given the location of this QCP under a plateau in Tc in addition to a postulated QCP at optimal doping, we discuss the intriguing possibility of two intersecting superconducting subdomes, each centred at a critical Fermi surface instability.

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