Magnetic Phase Diagram of the Hole-doped Ca${}_{2-x}$Na${}_x$CuO${}_2$Cl${}_2$ Cuprate Superconductor

Abstract

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 ($0.05\le x\le 0.12$), which is held between long range antiferromagnetic (AF) phase ($x\le 0.02$) and superconducting phase where the system is non-magnetic for $x\ge 0.15$. The obtained phase diagram qualitatively agrees well with that commonly found for hole-doped high-\tc cuprates, strongly suggesting that the incomplete suppression of the AF order for $x>0.02$ is an essential feature of the hole-doped cuprates.

5 pages, submitted to Phys. Rev. Lett

References in corpus (4)

• A `checkerboard' electronic crystal state in lightly hole-doped Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
• Muon spin relaxation studies of incommensurate magnetism and superconductivity in stage-4 La${}_2$CuO${}_{4.11}$ and La${}_{1.88}$Sr${}_{0.12}$CuO${}_4$
• Imaging nano-scale electronic inhomogeneity in lightly doped Mott insulator Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
• Angle-resolved photoemission spectroscopy of Na-doped Ca2CuO2Cl2 single crystals: Fingerprints of a magnetic insulator in a heavily underdoped superconductor

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