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The origin of charge inhomogeneity in YBa_{2}Cu_{3}O_{y} is investigatedusing a new experimental method designed to determine the nuclear quadrupoleresonance (NQR) asymmetry parameter eta for very wide NQR lines at differentpositions on the line. The method is based on the measurement of the echointensity as a function of the angle between the radio frequency field H1 andthe principal axis of the electric field gradient. Static charge inhomogeneitydeduced from eta>0 are found in this compound, but only in conjunction withoxygen deficiency. This limits considerably the possible forms of chargeinhomogeneity in bulk YBa_{2}Cu_{3}O_{y}.Comment: To be published in Phys. Rev. B; Revised version with a correction to  figure

physical review. b, condensed matter and materials physics

Charge-inhomogeneity doping relations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mi>y</mml:mi></mml:msub></mml:mrow></mml:math>detected by angle-dependent nuclear quadrupole resonance

Charge-inhomogeneity doping relations inYBa2Cu3Oydetected by angle-dependent nuclear quadrupole resonance