Muon investigation of HoMnO3 and YMnO3 hexagonal manganites

The magnetic properties of multiferroics HoMnO₃ and YMnO₃ have been investigated using the muon (μSR) method. Analysis of the dependence of the dynamical relaxation rate λ and characteristics of the distribution of local static fields makes it possible to more precisely determine the phase states of the samples under investigation.     

Adiabatic potentials of linear three-site mixed-valence systems

We propose a method for calculating adiabatic potentials of linear or quasi-linear threesite systems of mixed valence. The method is based on transformation of the potential energy matrix to two effective interacting modes. The adiabatic potential is calculated and its extrema are found. The electronic wave functions at the minima of the adiabatic potential correspond to complex charge distributions in a cluster. The barrier to transition of the extra electron between the terminal atoms is lower than for the transition from the terminal atom to the central atom.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 2, pp. 129–134, March–April, 1989.