Orbital selective coupling in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeRh</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: Coexistence of high Curie and high Kondo temperatures
Andrea Amorese, P. Hansmann, Andrea Marino, Peter O. Körner, Thomas Willers, A. C. Walters, Ke‐Jin Zhou, K. Kummer, N. B. Brookes, Hong‐Ji Lin, Chien‐Te Chen, P. Léjay, M. W. Haverkort, L. H. Tjeng, A. Severing
Abstract
Orbital selective coupling explains the exotic ferromagnetism in CeRh${}_{3}$B${}_{2}$, which combines a high Curie temperature, a strongly reduced ordered moment, strong intermediate valence, and a high Kondo temperature. The cigar-shaped Ce 4$f$ |${J}_{z}$ = \textonehalf{}⟩ states couples with the Ce 5$d$ states setting up the ferromagnetism, while the in-plane Ce 4$f$ |${J}_{z}$ =⁵\textfraction{}₂⟩ hybridizes with the surrounding B states, forming the Kondo state. The image shows the crystal field potential of the Ce 4$f$ states; the preferred directions of interaction are shown in blue, while the least favored ones are marked in red.