Uniaxial pressure control of competing orders in a high-temperature superconductor

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Science  30 Nov 2018:
Vol. 362, Issue 6418, pp. 1040-1044
DOI: 10.1126/science.aat4708

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Squeezing into the third dimension

Cuprate superconductors are known to harbor charge order in part of their phase diagram. Curiously, the order has a two-dimensional (2D) character at zero magnetic field, whereas a 3D order appears at high fields. Kim et al. now show that in a yttrium-based cuprate, a 3D charge order can be induced even at zero magnetic field. The authors compressed the material along one direction and measured a large inelastic x-ray scattering signal that was consistent with the formation of a 3D order. The measurements suggest that the induced order is associated with an optical lattice mode in the material.

Science, this issue p. 1040