Characterization of photoinduced normal state through charge density wave in superconducting YBa${}_2$Cu${}_3$O${}_{6.67}$

Abstract

The normal state of high-Tc cuprates has been considered one of the essential topics in high-temperature superconductivity research. However, compared to the high magnetic fields study of it, understanding a photoinduced normal state remains elusive. Here, we explore a photoinduced normal state of YBa${}_2$Cu${}_3$O${}_{6.67}$ (YBCO) 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 non-equilibrium state in which 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, revealing that the photoinduced CDW is similar to phenomena shown under magnetic fields. 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.

arXiv comment22 pages, 5 figures and Supplementary Materials with 6 pages, 9 figures

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• Introducing new resonant soft x-ray scattering capability in SSRL
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• Metastability in Coexisting Competing Orders
• Dynamic charge order from strong correlations in the cuprates
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• Superconductivity Reinforces Charge-Density-Wave Phase Coherence across Cuprates
• Collective Magnetic Excitations in a Photo-excited Electron-doped Cuprate Superconductor