Orbital-Driven Electronic Structure Changes and the Resulting Optical Anisotropy of the Quasi-Two-Dimensional Spin Gap Compound La4Ru2O10

TL;DR

This study explores how orbital-driven electronic structure changes induce optical anisotropy in La4Ru2O10, revealing the role of orbital ordering in the spin gap state of a quasi-two-dimensional material.

Contribution

It demonstrates the impact of orbital ordering on electronic structure and optical anisotropy in La4Ru2O10, a non-one-dimensional spin gap compound.

Findings

Optical spectra show temperature-dependent anisotropy.

Orbital ordering is key to the spin gap formation.

Electronic structure changes are driven by orbital interactions.

Abstract

We investigated the electronic response of the quasi-two-dimensional spin gap compound La4Ru2O10 using optical spectroscopy. We observed drastic changes in the optical spectra as the temperature decreased, resulting in anisotropy in the electronic structure of the spin-singlet ground state. Using the orbital-dependent hopping analysis, we found that orbital ordering plays a crucial role in forming the spin gap state in the non-one-dimensional material.