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Magnetic Phase Diagram of Hole-Doped Ca<sub>2-<i>x</i></sub>Na<sub><i>x</i></sub>CuO<sub>2</sub>Cl<sub>2</sub>Cuprate Superconductor
We report on the magnetic phase diagram of a hole-doped cuprate Ca$_{2-x}$Na$_{x}$CuO$_{2}$Cl$_{2}$, which is free from buckling of CuO$_2$ planes, determined by muon spin rotation and relaxation. It is characterized by a quasi-static spin glass-like phase over a range of sodium concentration ($0.05\leq x\leq 0.12$), which is held between long …