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We studied low-frequency spin dynamics near the impurity-inducedsuperconductor-to-insulator transition for underdoped high-Tc superconductorYBa2(Cu1-xMx)4O8 (M=Ni, Zn) using the Cu nuclear quadrupole resonance (NQR)spin-echo technique. We observed remarkable suppression of the normal-statepseudo spin-gap and a loss of Cu NQR spectrum intensity at low temperaturesaround the critical impurity concentration.Comment: 6 pages, 4 figures. To be published in J. Phys. Soc. Jpn. Vol.70,  No.7 (2001

Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa2Cu4O8

Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa₂Cu₄O₈