Strain and high temperature superconductivity: unexpected results from direct electronic structure measurements in thin films

• Published in: Physical review letters Vol. 91; no. 5; p. 057002
• Main Authors: Abrecht, M, Ariosa, D, Cloetta, D, Mitrovic, S, Onellion, M, Xi, X X, Margaritondo, G, Pavuna, D
• Format: Journal Article
• Language: English
• Published: United States 01.08.2003

Angle-resolved photoemission spectroscopy reveals very surprising strain-induced effects on the electronic band dispersion of epitaxial La(2-x)Sr(x)CuO(4-delta) thin films. In strained films we measure a band that crosses the Fermi level (E(F)) well before the Brillouin zone boundary. This is in con...