Temperature-dependent electron-phonon coupling in La2−xSrxCuO4 probed by femtosecond x-ray diffraction

B. Mansart,1 M. J. G. Cottet,1 G. F. Mancini,1 T. Jarlborg,2 S. B. Dugdale,3 S. L. Johnson,4,5 S. O. Mariager,4 C. J. Milne,6 P. Beaud,4 S. Grübel,4 J. A. Johnson,4 T. Kubacka,5 G. Ingold,4 K. Prsa,7 H. M. Rønnow,7 K. Conder,8 E. Pomjakushina,8 M. Chergui,6 and F. Carbone1 1Laboratory for Ultrafast Microscopy and Electron Scattering, ICMP, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland 2DPMC, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland 3H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom 4Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland 5ETH-Zürich, CH-8093 Zürich, Switzerland 6Laboratory of Ultrafast Spectroscopy, ISIC, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland 7Laboratory for Quantum Magnetism, ICMP, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland 8Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Switzerland (Received 26 February 2013; revised manuscript received 31 July 2013; published 19 August 2013)