2005/09/06 by L. Craco, C. I. Ventura, A. N. Yaresko +2
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Criticality #Electron #Hubbard model #Magnetic and transport properties of perovskites and related materials #Nuclear materials and radiation effects #Nuclear physics #Paramagnetism #Physics #Quantum #Quantum mechanics #Strongly correlated material #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.73.094432
4 pages, 4 figures
arxiv created 2005/09/06 · openalex publication_date 2006/03/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a correlated ab initio description of the paramagnetic phase of Tl2Mn2O7, employing a combined local density approximation with multiorbital dynamical mean-field theory treatment. We show that the insulating state observed in this colossal magnetoresistance pyrochlore is determined by strong Mn intra- and inter-orbital local electron-electron interactions. Hybridization effects are reinforced by the correlation-induced spectral weight transfer. Our result coincides with optical conductivity measurements, whose low-energy features are well accounted for by our theory. We also study the disorder-driven insulator-metal transition of doped compounds, showing the proximity of Tl2Mn2O7 to quantum phase transitions, in agreement with recent measurements.