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TT: Fachverband Tiefe Temperaturen

TT 86: Correlated Electrons: Other Materials

TT 86.2: Vortrag

Donnerstag, 3. April 2014, 09:45–10:00, BEY 81

The insulating phases of Vanadium Sesquioxide (V₂O₃) — •Daniel Grieger¹, Frank Lechermann², and Michele Fabrizio¹ — ¹SISSA - Scuola Internazionale Superiore di Studi Avanzati, Trieste, Italy — ²1. Institut für Theoretische Physik, Universität Hamburg, Germany

Vanadium Sesquioxide (V₂O₃) has attracted large attention mainly because of its prototypical Mott insulating behaviour with negative (chemical) pressure/Chromium doping. Besides trying to shed some light on the actual difference between doping and pressure in view of electronic correlations modelled by the charge self-consistent LDA+DMFT approach, this contribution is primarily aimed at the low-temperature (T<140K) antiferromagnetic insulating phase, which has not been properly understood for the last 40 years. It shows a peculiar magnetic ordering involving ferromagnetic out-of-plane bonds and two antiferromagnetic/one ferromagnetic in-plane bond per Vanadium atom, at the additional energetic cost of a monoclinic structural distortion. Arguments about why this complicated structure turns out to be stable are given from a combination of traditional electronic structure formalisms and DFT+-like approaches.