STRUCTURAL DISTORTION IN LUDWIGITES
Structural distortion in a three-leg-ladder is studied in connection with Ludwigites, in particular the Fe and Co homometallic ones. Static impurities in t2g-orbitals as infinite repulsion potentials randomly located in the three-leg-ladder and a Su–Schrieffer–Heeger like tight-binding Hamiltonian are proposed and discussed. It is found that such potentials block itinerant electrons and diminish a structural staggered order parameter, related with structural distortion, as 3-M being M the number of impurities. This diminution is in detriment of Peierls like distortion that occurs in these ladders as in the case of Fe -Ludwigite. On the other hand, this diminution could explain the lack of structural distortion as in the case of Co -Ludwigite.