Cu Nuclear Quadrupole Resonance Study of La<sub>2-<i>x</i></sub>Sr<sub><i>x</i></sub>Cu<sub>1-<i>y</i></sub>Zn<sub><i>y</i></sub>O<sub>4</sub>(<i>x</i>=0.10, 0.15 and 0.20): Zn-induced Wipeout Effect near the Magnetic and Electric Instability

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  • 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

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We studied Zn-substitution effect on the high-Tc superconductors, underdoped La2−xSrxCu1−yZnyO4 (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 of T=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 the Sr-optimally doped ones below about 50 K, but not for the overdoped x=0.20 ones. From the Zn-doping, the Sr-doping and the temperature dependence of the wipeout effect, we associate the wipeout effect with Zn-induced Curie magnetism or its extended glassy charge–spin stripe formation.

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