| | Condensed Matter Seminar: The light that Resonant Inelastic X-ray Scattering throws on High Tc Cuprates | |
|
|
| |
| |
| Resonant Inelastic X-ray Scattering (RIXS) provides direct access to elementary charge, spin and orbital excitations in complex oxides. 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 resolution) has for instance improved by four orders of magnitude in the last ten years.
Theorists in the mean time, asked themselves to which low-energy correlation functions RIXS is precisely sensitive. I will show that depending on the experimental RIXS set up, the measured charge dynamics can include charge-transfer, d-d and orbital excitations [1,2]. RIXS 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 Letters, 73 121 (2006).
[2] F. Forte, L. Ament and J. van den Brink, Phys. Rev. Lett. 101, 106406 (2008).
[3] J. van den Brink, Europhysics Letters 80, 47003 (2007).
[4] L. Braicovich et al., Phys. Rev. Lett. 102, 167401 (2009).
[5] L. Ament, G. Ghiringhelli, M. Moretti Sala, L. Braicovich and J. van den Brink, Phys. Rev. Lett. 103, 117003 (2009). |
| |
| |
|
|
