An X-ray absorption study of the electric field effect mechanism in “123” cuprates N. B. Brookes, G. Ghiringhelli, J. C. Cezar, G. M. De Luca and M. Salluzzo Eur. Phys. J. B, 70 2 (2009) 153-156 Published online: 26 June 2009 DOI: 10.1140/epjb/e2009-00221-5