The discovery of charge-density-wave order in the high-temperature
superconductor YBa$_2$Cu$_3$O$_{6+y}$ places charge order centre stage with
superconductivity, suggesting they they are intertwined rather than competing.Comment: 3 pages, 1 figure, 19 references; News & Views article for Nature
  Physic

Fradkin, Eduardo

Kivelson, Steven A.

English

arXiv

The discovery of charge-density-wave order in the high-temperature superconductor YBa2Cu3O6+y places charge order centre stage with superconductivity, suggesting they they are intertwined rather than competing. In physics, ‘understanding ’ involves simplifying a prob-lem as much as possible, but not so much that its essence is lost. Since high temperature superconductiv-ity (HTSC) was discovered in certain copper oxide com-pounds in 19861, it has been widely accepted that the heart of the problem is the interrelation between the (d-wave) superconducting state, the proximate ‘Mott insu-lating ’ phase that has long range antiferromagnetic order, and the mysterious ‘bad ’ metal phase that dominates the phase diagram at temperatures well above Persistent evi-dence of other forms of electronic order, including charge and spin density wave orders and nematic charge order

High Temperature Superconductivity: Ineluctable Complexity

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