Zn-induced wipeout effect on Cu NQR spectra in La$_{2-x}$Sr$_x$Cu$_{1-y}$Zn$_y$O$_4$

H. Yamagata; H. Miyamoto; K. Nakamura; M. Matsumura; Y. Itoh

doi:10.1016/S0921-4534(02)02419-X

paper

Zn-induced wipeout effect on Cu NQR spectra in La $_{2 - x}$ Sr $_{x}$ Cu $_{1 - y}$ Zn $_{y}$ O $_{4}$

arXiv:cond-mat/0210257 · doi:10.1016/S0921-4534(02)02419-X

Abstract

We report a systematic study of Zn-substitution effect on Cu NQR spectrum for high $T_{c}$ superconductors La $_{2 - x}$ Sr $_{x}$ Cu $_{1 - y}$ Zn $_{y}$ O $_{4}$ from carrier-underdoped to -overdoped regimes (polycrystalline samples, $x$ =0.10, 0.15, and 0.20). We observed no appreciable wipeout effect for the overdoped samples, a gradual and partial wipeout effect below about 80 K for the optimally doped ones, and very abrupt and full wipeout effect below about 40 K for the underdoped ones. The wipeout effect indicates a highly enhanced spectral weight of Cu spin fluctuations at a low frequency. We associate the wipeout effect with a Zn-induced local magnetism far above 40 K and with a localization effect below 40 K.

2 pages, 3 figures, accepted for publication in Physica C (LT23, Hiroshima 2002)

Zn-induced wipeout effect on Cu NQR spectra in La2−x​Srx​Cu1−y​Zny​O4​

Abstract

Zn-induced wipeout effect on Cu NQR spectra in La $_{2 - x}$ Sr $_{x}$ Cu $_{1 - y}$ Zn $_{y}$ O $_{4}$