Three-dimensional dispersion induced by extreme tensile strain in La_(2−x)Sr_xCuO_4 films

The electronic band structure probed by angle-resolved photoemission spectroscopy on thin epitaxial La_(2−x)Sr_(x)CuO_(4) films under extreme tensile strain shows anomalous features compatible with c-axis dispersion. This result is in striking contrast with the usual quasi-two-dimensional (2D) dispersion observed up to now in most superconducting cuprates, including relaxed and compressively strained La_(2−x)Sr_(x)CuO_(4) films grown under the same conditions. The data were analyzed using a 3D tight-binding dispersion for a body-centeredtetragonal lattice. We relate the enhancement of the c-axis dispersion to the significant displacement of the apical oxygen induced by epitaxial strain.


Published in:
Physical Review B, 74, 014519, 1-7
Year:
2006
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Note:
Institute of Physics of Complex Matter, EPFL, Switzerland and Synchrotron Radiation Center, University of Wisconsin, Madison.
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Note: The status of this file is: EPFL only


 Record created 2007-02-12, last modified 2018-03-17

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