Strain-induced long-range charge-density wave order in the optimally doped Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_6$ superconductor

Abstract

The mechanism of high-temperature superconductivity in copper oxides (cuprate) remains elusive, with the pseudogap phase considered a potential factor. Recent attention has focused on a long-range symmetry-broken charge-density wave (CDW) order in the underdoped regime, induced by strong magnetic fields. Here by ${}^{63,65}$Cu-nuclear magnetic resonance, we report the discovery of a long-range CDW order in the optimally doped Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_6$ superconductor, induced by in-plane strain exceeding $|$$\epsilon$$|$ = 0.15 %, which deliberately breaks the crystal symmetry of the CuO${}_2$ plane. We find that compressive/tensile strains reduce superconductivity but enhance CDW, leaving superconductivity to coexist with CDW. The findings show that a long-range CDW order is an underlying hidden order in the pseudogap state, not limited to the underdoped regime, becoming apparent under strain. Our result sheds light on the intertwining of various orders in the cuprates.

arXiv comment10 pages, 6 figures

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Cited by in corpus (5)

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• Quest for nuclear quadrupole relaxation in HgCa${}_2$Ba${}_2$Cu${}_3$O${}_{8+\delta }$
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• Theoretical perspectives on charge dynamics in high-temperature cuprate superconductors