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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.25: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Optical sum rule anomalies in high-temperature superconductors — •Alessandro Toschi1, Giorgio Sangiovanni1, Karsten Held1, Massimo Capone2,3, and Claudio Castellani2 — 1Institut für Festkörperphysik, Technische Universität Wien, Austria — 2Dipartimento di Fisica, Università "La Sapienza", Roma, Italy — 3SMC, CNR-INFM, Roma, Italy
Many unusual features recently observed in the optical spectroscopy experiments in the cuprates can be simply understood[1] as arising from the vicinity to the Mott transition, without invoking more involved and exotic mechanisms. Specifically, we compare calculations based on the Dynamical Mean Field Theory (DMFT) of the Hubbard model with the optical spectral weight Wopt of different cuprates, explaining most of the anomalies found in the optical sum rules with respect to normal metals, including the existence of two different energy scales for the doping- and the T-dependence of Wopt. A further support to this result is provided by the analysis of the optical conductivity in a typical case of the Mott-Hubbard metal-insulator transition, namely the V2O3[2].
[1] A.Toschi, M. Capone, M. Ortolani, P. Calvani, S. Lupi, and C. Castellani, Phys. Rev. Lett. 95, 097002 (2005); A.Toschi, and M. Capone, Phys. Rev. B 77, 014518 (2008).
[2] L. Baldassarre , A. Perucchi, D. Nicoletti, A.Toschi, G. Sangiovanni, K.Held M. Capone, M. Ortolani, L. Malavasi, M. Marsi, P. Metcalf, P. Postorino, and S. Lupi, Phys. Rev. B 77, 113107 (2008).