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

References in corpus (9)

• Two Gaps Make a High Temperature Superconductor?
• Striped superconductors: How the cuprates intertwine spin, charge and superconducting orders
• A multi-component Fermi surface in the vortex state of an underdoped high-Tc superconductor
• Planes, Chains, and Orbits: Quantum Oscillations and High Magnetic Field Heat Capacity in Underdoped YBCO
• Quantum oscillations from nodal bilayer magnetic breakdown in the underdoped high temperature superconductor YBa2Cu3O6+x
• Spectral signatures of modulated d-wave superconducting phases
• Quantum Oscillations in the mixed state of d-wave superconductor
• Magneto-oscillations in Underdoped Cuprates
• Hard antinodal gap revealed by quantum oscillations in the pseudogap regime of underdoped high-$T_{\mathrm{c}}$ superconductors