Abstract
The temperature-dependent amplitude of the Cu-O(planar) bond modulation in the ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4.1}$ superconducting crystal has been measured by in-plane-polarized Cu K-edge extended x-ray-absorption fine structure. Minority domains characterized by a long Cu-O(planar) bond length are found at T150 K. The separation between the two Cu-O(planar) distances provides a measure of the amplitude of the ${\mathrm{CuO}}_{2}$ lattice modulation assigned to a charge-density wave that coexists with the superconducting phase, providing evidence for a broken symmetry.
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