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The optical conductivity $\sigma_{1}(\omega)$ of Eu$_{1-x}$Ca$_{x}$B$_{6}$has been obtained from reflectivity and ellipsometry measurements for series ofcompositions, $0\leq x\leq 1$. The interband part of $\sigma_{1}(\omega) $shifts continuously to higher frequency as Ca-content $x$ increases. Also theintraband spectral weight of $\sigma_{1}(\omega)$ decreases rapidly andessentially vanishes for $x\geq x_{c}=0.35$. These results show that thevalence band and the conduction band of Eu$_{1-x}$Ca$_{x}$B$_{6}$ move awayfrom each other such that their band overlap decreases with increasingCa-substitution. As a result, the electronic state evolves from thesemimetallic structure of EuB$_{6}$ to the insulating CaB$_{6}$ where the twobands are separated to open a finite gap ($\simeq 0.25$ eV) at the X-point ofthe Brillouin zone.Comment: 5 pages, 4 figure

physical review. b, condensed matter and materials physics

Optical spectroscopy study of the electronic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Eu</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>

Optical spectroscopy study of the electronic structure ofEu1−xCaxB6