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17O NMR Study of the Local Charge State in the Hole Doped Cu2O3 Two-Leg Spin-Ladder A14Cu24O41 (A=La6Ca8, Sr14, Sr11Ca3, Sr6Ca8)

K. R. Thurber·K. M. Shen·A. W. Hunt·T. Imai·F. C. Chou
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Abstract

NMR measurements of the ^{17}O nuclear quadrupole interactions, ^{17}ν_{Q}, show that the charge environment of the S=1/2 Cu_{2}O_{3} two-leg spin-ladder layer of hole-doped A_{14}Cu_{24}O_{41} changes dramatically above a certain temperature, T*. This temperature, T*, decreases with additional doping and is correlated with the magnetic crossover from the spin gap regime to the paramagnetic regime. We demonstrate that these changes in ^{17}ν_{Q} are consistent with an increase in the effective hole concentration in the Cu_{2}O_{3} two-leg ladder above T*. The effective hole concentration increases primarily in the oxygen 2pσorbitals.

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K. R. Thurber, K. M. Shen, A. W. Hunt, T. Imai, F. C. Chou. 2002-11-01. 17O NMR Study of the Local Charge State in the Hole Doped Cu2O3 Two-Leg Spin-Ladder A14Cu24O41 (A=La6Ca8, Sr14, Sr11Ca3, Sr6Ca8). https://doi.org/10.1103/physrevb.67.094512

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