Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 107, Issue 14, Pages 6175-6179Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0913711107
Keywords
fermi surface; high temperature superconductivity; metal-insulator transition; quantum oscillations; quantum critical point
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Funding
- U. S. Department of Energy
- National Science Foundation
- State of Florida
- BES program Science in 100 T,
- Trinity College (University of Cambridge)
- Engineering and Physical Sciences Research Council [EP/C511778/1] Funding Source: researchfish
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An enduring question in correlated systems concerns whether superconductivity is favored at a quantum critical point (QCP) characterized by a divergent quasiparticle effective mass. Despite such a scenario being widely postulated in high T-c cuprates and invoked to explain non-Fermi liquid transport signatures, experimental evidence is lacking for a critical divergence under the superconducting dome. We use ultrastrong 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 T-c in addition to a postulated QCP at optimal doping, we discuss the intriguing possibility of two intersecting superconducting subdomes, each centered at a critical Fermi surface instability.
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