Characterization of photoinduced normal state through charge density wave in superconducting YBa <sub>2</sub> Cu <sub>3</sub> O <sub>6.67</sub>
Hoyoung Jang, Sanghoon Song, Takumi Kihara, Yijin Liu, Sang‐Jun Lee, Sang‐Youn Park, Minseok Kim, Hyeong‐Do Kim, Giacomo Coslovich, S. Nakata, Yuya Kubota, Ichiro Inoue, Kenji Tamasaku, Makina Yabashi, Heemin Lee, Changyong Song, Hiroyuki Nojiri, B. Keimer, C.-C. Kao, Jun‐Sik Lee
Abstract
The normal state of high- T c cuprates has been considered one of the essential topics in high-temperature superconductivity research. However, compared to the high magnetic field study of it, understanding a photoinduced normal state remains elusive. Here, we explore a photoinduced normal state of YBa 2 Cu 3 O 6.67 through a charge density wave (CDW) with time-resolved resonant soft x-ray scattering, as well as a high magnetic field x-ray scattering. In the nonequilibrium state where people predict a quenched superconducting state based on the previous optical spectroscopies, we experimentally observed a similar analogy to the competition between superconductivity and CDW shown in the equilibrium state. We further observe that the broken pairing states in the superconducting CuO 2 plane via the optical pump lead to nucleation of three-dimensional CDW precursor correlation. Ultimately, these findings provide a critical clue that the characteristics of the photoinduced normal state show a solid resemblance to those under magnetic fields in equilibrium conditions.