New Type Phase Transition of Li2RuO3 with Honeycomb Structure
Yoko Miura, Yukio Yasui, Masatoshi Sato, Naoki Igawa, Kazuhisa, Kakurai
TL;DR
This paper reports a novel phase transition in Li2RuO3 characterized by a structural change, increased resistivity, and altered magnetic properties, driven by Ru-Ru pair bond formation in a honeycomb lattice.
Contribution
It uncovers a new type of structural phase transition involving Ru-Ru pairing and orbital formation in Li2RuO3 with a honeycomb structure.
Findings
Resistivity increases sharply at Tc~540 K.
Structural change from C2/m to P21/m space group.
Significant Ru-Ru bond length reduction in low temperature phase.
Abstract
A new-type structural transition has been found in Li2RuO3 with honeycomb lattice of edge-sharing RuO6-octahedra. With decreasing temperature T, the electrical resistivity exhibits an anomalous increase at T=Tc~540 K, suggesting the (metal to insulator)-like transition and the magnetic susceptibility also shows a sharp decrease. Detailed structure analyses have revealed that the high temperature space group C2/m changes to P21/m at Tc. The most striking fact is that a significant reduction of the bond lengths is found between two of six Ru-Ru pairs of the hexagon in the low temperature phase, indicating a new type phase transition by the mechanism of the formation of molecular orbits of these Ru-Ru pairs.
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