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Phys Rev Lett. 2002 Jan 28;88(4):047602. Epub 2002 Jan 15.

63Cu NQR evidence for spatial variation of hole concentration in La2-xSrxCuO4.

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Department of Physics and Center for Materials Science and Engineering, M.I.T., Cambridge, Massachusetts 02139, USA.


We report experimental evidence for the spatial variation of hole concentration x(hole) in the high T(c) superconductor La2-xSrxCuO4 ( 0.04 < or = x < or = 0.16) via 63Cu NQR using 63Cu isotope enriched samples. We demonstrate that the extent of the spatial variation of the local hole concentration Delta(x)hole is reflected on (63)1/T1 and deduce the temperature dependence. Delta(x)hole increases below 500-600 K, and reaches values as large as Delta(x)hole/x approximately 0.5 below approximately 150 K. We estimate the length scale of the spatial variation in x(hole) to be R(hole) greater, similar 3 nm from an analysis of the NQR spectrum.

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