Fig. 2
From: High field charge order across the phase diagram of YBa2Cu3Oy
a, b Field dependence of the sound velocity of the c22 mode in YBCO (p = 0.122) measured at temperatures ranging from 9.8 to 45.2 K. The arrows indicate HCO, the charge order onset field. Curves are shifted vertically for clarity. c Temperature–magnetic field phase diagram of YBCO (p = 0.122) deduced from sound velocity measurements. HCO (full red circles) and H v (open black squares) are obtained from measurements shown in the upper panels. TCO (open red circles) is deduced from the temperature dependence of the sound velocity shown in Fig. 1 and Fig. S2. Blue circles correspond to HCO measured at low temperatures using the field dependence of the transverse mode c66 (see Fig. S5). Dashed line is a guide to the eye
