Advances in ab-initio theory of Multiferroics. Materials and mechanisms: modelling and understanding

Within the broad class of multiferroics (compounds showing a coexistence of magnetism and ferroelectricity), we focus on the subclass of "improper electronic ferroelectrics", i.e. correlated materials where electronic degrees of freedom (such as spin, charge or orbital) drive ferroelectricity. In particular, in spin-induced ferroelectrics, there is not only a {\em coexistence} of the two intriguing magnetic and dipolar orders; rather, there is such an intimate link that one drives the other, suggesting a giant magnetoelectric coupling. Via first-principles approaches based on density functional theory, we review the microscopic mechanisms at the basis of multiferroicity in several compounds, ranging from transition metal oxides to organic multiferroics (MFs) to organic-inorganic hybrids (i.e. metal-organic frameworks, MOFs)Comment: 22 pages, 9 figure

The Rhodes-Wohlfarth parameter as assessment of the displacive degree in ferroelectrics: The case of the Ф 4> model

PACS. 64.70.Kb Solid-solid transitions[:AND:]64.90.+b Other topics in equations of state, phase equilibria, and phase transitions dynamics (restricted to new topics in section 64),

computer program abstracts Journal of Applied

SUBGROUPGRAPH: a compute

PSEUDO: a program for a pseudosymmetry

189±190, also available from Crystallography Journals Online a