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 $p>p_c$.

arXiv comment5 pages, 4 figures, accepted as a Rapid Communication in PRB

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• Cuprate superconductors as viewed through a striped lens
• Coexistence of cluster spin glass and superconductivity in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ for $0.060\le x\le 0.071$
• Intermediate Coupling Model of the Cuprates
• Multiscale distribution of oxygen puddles in 1/8 doped YBa2Cu3O6.67
• Neutron scattering study of spin ordering and stripe pinning in superconducting La${}_{1.93}$Sr${}_{0.07}$CuO${}_4$
• Magnetic field-enhanced spin freezing in YBa2Cu3O6.45 at the verge of the competition between superconductivity and charge order
• Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates
• Lattice dynamical signature of charge density wave formation in underdoped YBa2Cu3O6+x
• Two types of superconducting domes in unconventional superconductors
• Anharmonic theory of superconductivity and its applications to emerging quantum materials
• Glass-induced enhancement of superconducting $T_c$: Pairing via dissipative mediators
• Cu-NMR study of oxygen disorder in ortho-II YBa2Cu3Oy
• 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
• The High Temperature Superconductivity in Cuprates: Physics of the Pseudogap Region
• Stripe Antiferromagnetism and Disorder in the Mott Insulator NaFe${}_{1-x}$Cu${}_x$As ($x\lesssim 0.5$)
• Separation of magnetic and superconducting behaviour in YBCO6.33 (Tc=8.4 K)
• Nodeless superconducting gap induced by odd parity pair density wave in underdoped cuprates
• Relationship between electronic and crystal structure in Nd1+xBa2-xCu3O6+d