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

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