BEGIN:VCALENDAR PRODID:-//University of Illinois//Web Services Calendar//EN VERSION:2.0 CALSCALE:GREGORIAN BEGIN:VEVENT DTSTAMP:20120214T135626Z DTSTART;TZID=America/Chicago:20091106T130000 DTEND;TZID=America/Chicago:20091106T130000 SUMMARY:Condensed Matter Seminar: The light that Resonant Inelastic X-ray Scattering throws on High Tc Cuprates CREATED:20090824T120000Z DESCRIPTION:Resonant Inelastic X-ray Scattering (RIXS) provides direct ac cess to elementary charge\, spin and orbital excitations in complex oxid es. As a technique it has made tremendous progress with the advent high- brilliance synchrotron X-ray sources. The figure of merit for so-called K-edge RIXS experiments on the cuprates (inelastic count-rate/energy res olution) has for instance improved by four orders of magnitude in the la st ten years. Theorists in the mean time\, asked themselves to which low -energy correlation functions RIXS is precisely sensitive. I will show t hat depending on the experimental RIXS set up\, the measured charge dyna mics can include charge-transfer\, d-d and orbital excitations [1\,2]. R IXS also allows to probe spin dynamics\, in particular the dispersion of magnons and bi-magnons [3\,4\,5]. Based on these observations\, I will discuss the novelties that RIXS reveals on the spin dynamics of High Tc cuprates.[1] J. van den Brink and M. van Veenendaal\, Europhysics Letter s\, 73 121 (2006).[2] F. Forte\, L. Ament and J. van den Brink\, Phys. R ev. Lett. 101\, 106406 (2008).[3] J. van den Brink\, Europhysics Letters 80\, 47003 (2007).[4] L. Braicovich et al.\, Phys. Rev. Lett. 102\, 167 401 (2009).[5] L. Ament\, G. Ghiringhelli\, M. Moretti Sala\, L. Braicov ich and J. van den Brink\, Phys. Rev. Lett. 103\, 117003 (2009). LAST-MODIFIED:20091029T120000Z LOCATION:190 ESB\, 1101 W. Springfield\, Urbana CATEGORIES:CM Seminar CONTACT:Peggy Pennell 244-7636 ORGANIZER:ppennell@illinois.edu URL:http://illinois.edu/calendar/detail/1968?key=2000010120000101133272 UID:133272@illinois.edu END:VEVENT END:VCALENDAR