Making sense of the cuprate pseudogap

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Science  11 Aug 2017:
Vol. 357, Issue 6351, pp. 561-562
DOI: 10.1126/science.357.6351.561-e

One of the outstanding questions in the physics of cuprate high-temperature superconductors is whether the so-called pseudogap—a depression in the density of states around Fermi energy that occurs above the superconducting transition temperature—is caused by a true phase transition. Sato et al. measured the magnetic torque in the compound YBa2Cu3Oy with high precision and found a kink in the magnetic anisotropy for several samples of varying concentrations of oxygen. For all of these samples, the kink occurred very close to the temperature that marks the beginning of the pseudogap phase. These findings provide evidence that additional rotational symmetry breaking occurs at the entrance to the pseudogap phase.

Nat. Phys. 10.1038/NPHYS4205 (2017).

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