Charge Order and Fluctuations in Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_{6+\delta }$ Revealed by ${}^{63,65}$Cu-Nuclear Magnetic Resonance

Abstract

The discovery of a magnetic-field-induced charge-density-wave (CDW) order in the pseudogap state via nuclear magnetic resonance (NMR) studies has highlighted the importance of "charge" in the physics of high transition-temperature ($T_{\mathrm{c}}$) superconductivity in copper oxides (cuprates). Herein, after briefly reviewing the progress achieved in the last few years, we report new results of ${}^{63,65}$Cu-NMR measurements on the CDW order and its fluctuation in the single-layered cuprate Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_{6+\delta }$. The NMR spectrum under both in- and out-of-plane magnetic fields above $H$ = 10 T indicates that the CDW replaces the antiferromagnetic order before superconductivity appears, but disappears before superconductivity is optimized. We found that the CDW onset temperature $T_{\mathrm{CDW}}$ scales with the pseudogap temperature $T^{\ast }$. Comparison between ${}^{63}$Cu and ${}^{65}$Cu NMR indicates that the spin-lattice relaxation process is dominated by charge fluctuations in the doping regions where the CDW appears as well as at the pseudogap end point ($T^{\ast }$ = 0). These results suggest that charge orders and fluctuations exist in multiple doping regions and over a quite wide temperature range.

9 pages, 9 figures

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Cited by in corpus (4)

• Colloquium: Hydrodynamics and holography of charge density wave phases
• Fluctuating intertwined stripes in the strange metal regime of the Hubbard model
• Strain-induced long-range charge-density wave order in the optimally doped Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_6$ superconductor
• Quest for nuclear quadrupole relaxation in HgCa${}_2$Ba${}_2$Cu${}_3$O${}_{8+\delta }$