We show that in the one-dimensional (1D) Anderson model long-range correlations within the sequence of on-site potentials may lead to a region of extended states in the vicinity of the band centre, i.e., to a correlation-induced insulator-metal transition. Thus, although still disordered, the 1D system can behave as a conductor.

S. L. Skornyakov,1,2 V. I. Anisimov,1,2 and D. Vollhardt3 1Institute of Metal Physics, Russian Academy of Sciences, 620041 Yekaterinburg GSP-170, Russia 2Ural Federal University, 620002 Yekaterinburg, Russia 3Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany (Received 4 June 2012; revised manuscript...

The long-standing problem of the effect of correlations on the ferromagnetism of transition metals is apparently nearing solution. The ferromagnetism of transition metal compounds, for instance doped manganites, poses a new question: is there some kind of orbital order coexisting with itinerant ferromagnetism? The ideas and techniques introduced by Gutzwiller should be of use again.

BF(2) capped dipyrrin dimers were synthesized and have been used to terminate oligomerization to form a series of controlled length oligomers; the crystal structures of the metal complexes were investigated and correlations between the structures and optical properties were established.

Metal-insulator transitions driven by disorder (∆) and/or by electron correlations (U) are investigated within the Anderson-Hubbard model with local binary-alloy disorder using a simple but consistent mean-field approach. The ∆–U phase diagram is derived and discussed for T = 0 and finite temperatures.

Vanadium dioxide (VO2) is a paradigmatic example of a strongly correlated system that undergoes a metal-insulator transition at a structural phase transition. To date, this transition has necessitated significant post hoc adjustments to theory in order to be described properly. Here we report standard state-of-the-art first principles quantum Monte Carlo (QMC) calculations of the structural dep...

The optical and infrared properties of films of vanadium dioxide VO2 and vanadium sesquioxide V2O3 have been investigated via ellipsometry and near-normal incidence reflectance measurements from far infrared to ultraviolet frequencies. Significant changes occur in the optical conductivity of both VO2 and V2O3 across the metal-insulator transitions at least up to and possibly beyond 6 eV. We arg...

We studied the concentrations of Cd, Ni, Pb, Fe, Mg, and Zn in multi-floral honey, propolis, bee pollen, and wax coming from apiaries situated in different locations in Małopolska Voivodeship in southern Poland. Honey contained the lowest concentrations of all the tested metals, with Cd and Pb concentrations well below allowable levels. Other products showed much higher contamination by Cd and ...