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Observation of flat bands due to band hybridization in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>3</mml:mn><mml:mi>d</mml:mi></mml:mrow></mml:math> -electron heavy-fermion compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>CaC</mml:mi><mml:msub><mml:mi mathvariant="normal">u</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">R</mml:mi><mml:msub><mml:mi mathvariant="normal">u</mml:mi><mml:mn>4</mml:mn></mml:msub…
We report angle-resolved photoemission spectroscopy and first-principles numerical calculations for the band-structure evolution of the $3d$ heavy-fermion compound $\mathrm{CaC}{\mathrm{u}}_{3}\mathrm{R}{\mathrm{u}}_{4}{\mathrm{O}}_{12}$. Below $T\phantom{\rule{0.28em}{0ex}}\ensuremath{\sim}\phantom{\rule{0.28em}{0ex}}200$ K, we observed an emergent hybridization gap between the Cu 3d-electron-like band and the Ru 4d-hole-like band and the resulting flat band features near the Fermi level centered around …