Sound velocity study of charge order across the phase diagram of YBCO

D. LeBoeuf^1,*, C. Proust¹_, F. Laliberté¹, B. Borgnic¹ , M. Frachet¹ , J. Porras² , T. Loew² , M. Le Tacon² , B. Keimer²

¹Laboratoire National de Champs Magnétiques Intense, CNRS, EMFL, France

²Max Planck Institut, Stuttgart, Germany

Email: * david.leboeuf@lncmi.cnrs.fr

In underdoped YBCO, short range charge density wave correlations appear well above the critical temperature Tc^1,2. The charge modulations are mostly bidimensional. Below Tc, the application of a magnetic field causes change in the charge order and reveal a three dimensional and rather long range order, as seen by NMR³, sound velocity⁴ and x-ray measurements^5,6. Here we report a doping dependence of high fields ultrasonic measurements in underdoped YBCO to determine the phase diagram and the critical doping where charge order disappears.

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6. J. Chang et al., Nat. Comm. 7, 11494 (2016)