Ionic Model of Some Aspects of Cu NQR Spectra in Superconducting Oxides

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  • Ionic Model of Some Aspects of Cu NQR S

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We apply an ionic model to explain the pressure and the temperature dependences of copper nuclear quadrupole frequency νQ in superconducting oxides. The pressure and the temperature dependences of νQ can, for the most part, be explained only by the change in the lattice spacing. It has also been shown that the origin of large difference in the 63Cu NQR line width between crystallographically different copper sites in YBa2Cu3O6.5 can be explained in the same model. The result of the present study suggests that the Sternheimer antishielding factor γ is certainly effective in the case of ionic model, although a negligibly small value has been argued from viewpoint of the band calculation.

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