RESUMO
A striking universality in the electric-field-driven resistive switching is shown in three prototypical narrow-gap Mott systems. This model, based on key theoretical features of the Mott phenomenon, reproduces the general behavior of this resistive switching and demonstrates that it can be associated with a dynamically directed avalanche. This model predicts non-trivial accumulation and relaxation times that are verified experimentally.
RESUMO
We study the structure and vibrational modes of a wide range of oxohalides of vanadium (VOX(n)Y(m); X, Y = F, Cl, Br, I; n, m = 0-3, n + m < or = 3). The results agree well with experimental results for VOCl(3) and VOF(3) and suggest reassignment of the experimentally observed VOF to VOF(2). We provide new assignments for various experimental modes, identifying several intermediates (VOBr(2), VOBr) and mixed structures (e.g., VOCl(2)Br), and discuss formation trends and stabilities.