Journal
PHYSICAL REVIEW B
Volume 72, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.72.212511
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Cu-63 nuclear magnetic resonance (NMR) measurements on the electron-doped high-temperature superconducting cuprate (HTSC), Sr0.9La0.1CuO2, reveal a systematic and large reduction of the Cu NMR signal for temperatures below similar to 180 K. However, a large reduction is not observed for temperatures as low as 6 K in Pr1.85Ce0.15CuO4 that has a higher number of doped electrons per Cu. The reduction of the Cu NMR intensity arises from a spatially inhomogeneous and sudden slowing down of the electron spin dynamics that has been observed in underdoped and hole-doped HTSCs. Our results suggest a correspondence with the hole-doped HTSCs where a large wipeout of the Cu NMR signal is only observed for less than similar to 0.13 doped carriers per Cu.
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