Lattice dynamics calculation of infrared active modes of cuprate superconductors
PhysicaB_383_86.pdf 154 KB
We have calculated the highest-energy infrared active Eu mode for three cuprate compounds with and without apical ions, in order to investigate the experimental energy-difference between T- and T′-structures. The calculated energies show the similar Cu-O bond length dependence to the experimental results. The calculated spin densities of the T-structure have more electrons in the dx2- y2 orbital than that of the T′-structure. This means that the CuO2 plane in the T-structure is compressed, in comparison with the T′-structure even with the same Cu-O bond length. This compression increases the energy of the Eu mode in the T-structure. This is the clear evidence that the block layer is important for the electronic state on the CuO2 plane.
Physica B: Condensed Matter
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Copyright (c) 2006 Elsevier B. V.
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Graduate School of Integrated Arts and Sciences