Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Correlated Electrons: Metal-Insulator Transition 2
TT 34.3: Vortrag
Donnerstag, 28. Februar 2008, 14:30–14:45, H 2053
Birth and Death of Quasiparticles in the Mott-Hubbard Prototype V2O3 — Leonetta Baldassarre1, Andrea Perucchi1,2, Daniele Nicoletti1, Alessandro Toschi3, •Giorgio Sangiovanni3, Karsten Held3, Massimo Capone4, and Stefano Lupi1 — 1CNR-INFM COHERENTIA and Dipartimento di Fisica, Università di Roma “La Sapienza” — 2Sincrotrone Trieste S.C.p.A., in Area Science Park, Trieste — 3Max-Planck Institut für Festkörperforschung, Stuttgart — 4SMC, CNR-INFM and Dipartimento di Fisica, Università di Roma “La Sapienza” and ISC-CNR, Roma
The infrared conductivity of V2O3 is measured in the whole phase diagram to study the behavior of quasiparticles which appear above the Néel temperature TN, and eventually disappear further enhancing the temperature. We present theoretical calculations demonstrating that this loss of coherence in the vicinity of the Mott transition is enhanced by small changes of the lattice parameters. This leads to a downturn in the optical conductivity at small frequencies, as our experimental data show above 450 K.