Three-dimensional dispersion induced by extreme tensile strain in La2-xSrxCuO4 films
Abstract
The electronic band structure probed by angle-resolved photoemission spectroscopy on thin epitaxial La2-xSrxCuO4 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 La2-xSrxCuO4 films grown under the same conditions. The data were analyzed using a 3D tight-binding dispersion for a body-centered-tetragonal lattice. We relate the enhancement of the c -axis dispersion to the significant displacement of the apical oxygen induced by epitaxial strain.
- Publication:
-
Physical Review B
- Pub Date:
- July 2006
- DOI:
- 10.1103/PhysRevB.74.014519
- Bibcode:
- 2006PhRvB..74a4519C
- Keywords:
-
- 74.78.Bz;
- 68.60.Bs;
- 79.60.-i;
- High-T<sub>c</sub> films;
- Mechanical and acoustical properties;
- Photoemission and photoelectron spectra