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We studied Zn-substitution effect on the high-T_c superconductors, underdopedLa_{2-x}Sr_xCu_{1-y}Zn_yO_4 (x=0.10; y=0, 0.01, 0.02), optimally doped (x=0.15;y=0, 0.02), and overdoped (x=0.20; y=0, 0.03, 0.06) in a temperature range ofT=4.2-300 K, using Cu nuclear quadrupole resonance (NQR) spin-echo technique.We found full disappearance of the Cu NQR signals for the Zn-substituted,Sr-underdoped x=0.10 samples below about 40 K, partial disappearance for theSr-optimally doped ones below about 50 K, but not for the overdoped x=0.20ones. From the Zn-doping, the Sr-doping and the temperature dependence of thewipeout effect, we associate the wipeout effect with Zn-induced Curie magnetismor its extended glassy charge-spin stripe formation.Comment: 7 pages, 8 figures, to be published in J. Phys. Soc. Jpn. Vol.72, No.  7 (2003

journal of the physical society of japan

Cu Nuclear Quadrupole Resonance Study of La2-xSrxCu1-yZnyO4(x=0.10, 0.15 and 0.20): Zn-induced Wipeout Effect near the Magnetic and Electric Instability