Evidence of a critical hole concentration in underdoped YBa${}_2$Cu${}_3$O${}_y$ single crystals revealed by ${}^{63}$Cu NMR

Abstract

We report a ${}^{63}$Cu NMR investigation in detwinned YBa${}_2$Cu${}_3$O${}_y$ single crystals, focusing on the highly underdoped regime (y=6.35-6.6). Measurements of both the spectra and the spin-lattice relaxation rates of ${}^{63}$Cu uncover the emergence of static order at a well-defined onset temperature $T_0$ without a known order parameter as yet. While $T_0$ is rapidly suppressed with increasing hole doping concentration $p$, the spin pseudogap was identified only near and above the doping content at which $T_0\to 0$. Our data indicate the presence of a critical hole doping $p_c\sim 0.1$, which may control both the static order at $p<p_c$ and the spin pseudogap at $p>p_c$.

5 pages, 4 figures, accepted as a Rapid Communication in PRB

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Cited by in corpus (9)

• Theory of Intertwined Orders in High Temperature Superconductors
• Competing charge, spin, and superconducting orders in underdoped YBa2Cu3Oy
• Cuprate superconductors as viewed through a striped lens
• Intermediate Coupling Model of the Cuprates
• Multiscale distribution of oxygen puddles in 1/8 doped YBa2Cu3O6.67
• Glass-induced enhancement of superconducting $T_c$: Pairing via dissipative mediators
• Anharmonic theory of superconductivity and its applications to emerging quantum materials
• Low-energy spin dynamics and critical hole concentrations in La${}_{2-x}$Sr${}_x$CuO${}_4$ ($0.07\le x\le 0.2$) revealed by ${}^{139}$La and ${}^{63}$Cu nuclear magnetic resonance
• Separation of magnetic and superconducting behaviour in YBCO6.33 (Tc=8.4 K)