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Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CeCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
We show that the heavy-fermion compound ${\mathrm{CeCu}}_{2}{\mathrm{Si}}_{2}$ undergoes a transition between two regimes dominated by different crystal-field states. At low pressure $P$ and low temperature $T$ the Ce $4f$ electron resides in the atomic crystal-field ground state, while at high $P$ or $T$, the electron occupancy and spectral weight is …