NMR Evidence for Charge Inhomogeneity in Stripe Ordered La1.8-xEu0.2SrxCuO4
H. -J. Grafe, N. J. Curro, M. Hücker, B. Büchner
Abstract
We report 17O Nuclear Magnetic Resonance (NMR) results in the stripe ordered La1.8-xEu0.2SrxCuO4 system. Below a temperature Tq ~ 80K, the local electric field gradient (EFG) and the absolute intensity of the NMR signal of the planar O site exhibit a dramatic decrease. We interpret these results as microscopic evidence for a spatially inhomogeneous charge distribution, where the NMR signal from O sites in the domain walls of the spin density modulation are wiped out due to large hyperfine fields, and the remaining signal arises from the intervening Mott insulating regions.
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