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Phys Rev Lett. 2002 Oct 7;89(15):157002. Epub 2002 Sep 20.

Absence of static phase separation in the high T(c) cuprate YBa(2)Cu(3)O(6+y).

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Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, 91405 Orsay, France.


We use 89Y NMR in YBa(2)Cu(3)O(6+y) in order to evaluate with high sensitivity the distribution of hole content p in the CuO2 planes. For y=1 and y=0.6, this hole doping distribution is found narrow with a full width at half maximum smaller than Deltap=0.025. This rules out any large static phase separation between underdoped and optimally doped regions in contrast with the one observed by STM in Bi2212 and by NQR in LaSrCuO. This establishes that static electronic phase separation is not a generic feature of the cuprates.

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