Journal
PHYSICAL REVIEW LETTERS
Volume 93, Issue 3, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.037002
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By Cu NMR we studied the spin and charge structure in Nd2-xCexCuO4-delta. For x=0.15, starting from a superconducting sample, the low temperature magnetic order in the sample reoxygenated under 1 bar oxygen at 900 degreesC reveals a peculiar modulation of the internal field, indicative of a phase characterized by large charge droplets (blob phase). By prolonged reoxygenation at 4 bars the blobs break up and the spin structure changes to that of an ordered antiferromagnet. We conclude that the superconductivity in the n-type systems competes with a genuine type I Mott-insulating state.
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