Unconventional quantum vortex matter state hosts quantum oscillations in the underdoped high-temperature cuprate superconductors

Abstract

A central question in the underdoped cuprates pertains to the nature of the pseudogap ground state. A conventional metallic ground state of the pseudogap region has been argued to host quantum oscillations upon destruction of the superconducting order parameter by modest magnetic fields. Here we use low applied measurement currents and millikelvin temperatures on ultra-pure single crystals of underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$ to unearth an unconventional quantum vortex matter ground state characterized by vanishing electrical resistivity, magnetic hysteresis, and non-ohmic electrical transport characteristics beyond the highest laboratory accessible static fields. A new model of the pseudogap ground state is now required to explain quantum oscillations that are hosted by the bulk quantum vortex matter state without experiencing sizeable additional damping in the presence of a large maximum superconducting gap; possibilities include a pair density wave.

PNAS Commentary 'Fragile superconductivity at high magnetic fields' by Michael R. Norman, PNAS February 16, 2021 118 (7) e2100372118; https://doi.org/10.1073/pnas.2100372118

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• Quantifying nonadiabaticity in major families of superconductors
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• Quantum Hall Superconductivity from Moir{é} Landau Levels
• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition
• Extended strange metal regime from superconducting puddles
• Quantum oscillations from a pair-density wave
• Planckian Dissipation and non-Ginzburg-Landau Type Upper Critical Field in Bi2201
• Effects of vortex and antivortex excitations in underdoped Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$ bulk single crystals
• Doping Dependence of Upper Critical Field of High-Tc Cuprate Bi2+xSr2-xCaCu2O8+d Estimated from Irreversibility Field at Zero Temperature