Modification of structural disorder by hydrostatic-pressure in superconducting YBa${}_2$Cu${}_3$O${}_{6.73}$ cuprate

Abstract

Compelling efforts to improve the critical temperature ($T_c$) of superconductors have been made through high-pressure application. Understanding the underlying mechanism behind such improvements is critically important, however, much remains unclear. Here we studied ortho-III YBa${}_2$Cu${}_3$O${}_{6.73}$ (YBCO) using x-ray scattering under hydrostatic-pressure (HP) up to ~6.0 GPa. We found the reinforced oxygen order (OO) of YBCO under HP, revealing an oxygen rearrangement in the Cu-O layer, which evidently shows the charge transfer phenomenon between the CuO${}_2$ plane and Cu-O layer. Concurrently, we also observed no disorder-pinned charge density wave (CDW) signature in CuO${}_2$ plane under HP. This indicates that the oxygen rearrangement modifies the quenched disorder state in the CuO${}_2$ plane. Using these results, we appropriately explain why pressure-condition can achieve higher $T_c$ compared with the optimal $T_c$ under ambient pressure in YBa${}_2$Cu${}_3$O${}_{6+x}$. As an implication of these results, finally, we have discussed that the change in disorder could make it easier for YBa${}_2$Cu${}_3$O${}_{6+x}$ to undergo a transition to the nematic order under an external magnetic field.

arXiv comment24 pages, 6 figures

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Cited by in corpus (7)

• Sensitivity of $T_{\mathrm{c}}$ to pressure and magnetic field in the cuprate superconductor YBa${}_2$Cu${}_3$O${}_y$: evidence of charge order suppression by pressure
• NMR study of charge density waves under hydrostatic pressure in YBa2Cu3Oy
• Time-resolved resonant elastic soft X-ray scattering at Pohang Accelerator Laboratory X-ray Free Electron Laser
• Untwinned YBa${}_2$Cu${}_3$O${}_{7-\delta }$ thin films on MgO substrates: a platform to study strain effects on the local orders in cuprates
• Resonant x-ray scattering study of charge-density wave correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$ under uniaxial stress
• Hydrostatic pressure effect on the pseudogap in Y0.77Pr0.23Ba2Cu3O7-δsingle crystals
• Phase diagram of the two-dimensional Hubbard-Holstein model: enhancement of $s$-wave pairing between charge and magnetic orders