Nuclear Quadrupole Resonance Frequency in Multi-Layered Cuprates

Details Nuclear Quadrupole Resonance Frequency in Multi-Layered Cuprates Nuclear Quadrupole Resonance Frequency in Multi-Layered Cuprates

2009-08-26

arxiv.org/abs/0908.3721v2

J. Phys. Soc. Jpn, 78, 123704 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1143/JPSJ.78.123704

The 63Cu nuclear quadrupole resonance (NQR) frequency, nu_q, in the multi-layered cuprates is calculated in the cluster model by the exact diagonalization method. The charge imbalance between the outer CuO_2 plane (OP) with apical oxygen (OA) and the inner plane (IP) without OA in three-layered Tl2223 is estimated by comparing our results with the experimental nu_q. In Tl-based cuprates with more than three layers, we predict a large enhancement of the splitting of nu_q between OP and IP by taking into account the reduction of bond length between Cu and OA and a resulting enhancement of the charge transfer energy. Our results show that the NQR frequency is a useful quantity to estimate the charge imbalance in the multi-layered cuprates.

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