Fundamental optical properties of α-RuCl3 |
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Authors: | G Guizzetti E Reguzzoni I Pollini |
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Institution: | 1. Istituto di Fisica dell''Università di Pavia Italy;2. Gruppo Nazionale di Struttura della Materia del C.N.R., Italy;3. Istituto di Fisica dell''Università di Milano Italy;4. Gruppo Nazionale di Struttura della Materia del C.N.R., Italy |
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Abstract: | The fundamental optical properties in the paramagnetic phase of α-RuCl3 are studied at different temperatures in the photon energy interval 0.03 to 10 eV. Infrared reflectivity spectra show a transverse optical frequency at 0.038 eV (32 μm) for an Eu mode (E⊥c, in plane atomic displacements). The absorption spectra in the energy range 0.2 to 1 eV reveal three bands (0.29, 0.51, 0.71 eV) attributed to d-d electronic transitions. Reflectance and thermo-reflectance measurements indicate the onset of the charge-transfer transitions at 1.1 eV and show structure at 1.85, 2.55, 3.05, 4.5 eV. The marked reflectivity peak at 5.2 eV is probably related to p(Cl) → s(Ru) band-to-band transitions. |
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