Electronic Structure of Strongly Correlated Systems

Figure 59

The experimental optical reflectivity spectrum 𝑅(𝜔) of YbB₁₂ (open circles) measured at 290 K [358] in comparison with theoretical calculations in the LSDA+𝑈 approximation: dotted line for Yb³⁺, dashed line for Yb²⁺ ions, and solid line for 𝑅=0.2∗𝑅²⁺+0.8∗𝑅³⁺[349].