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Orbitally defined field-induced electronic state in a Kondo lattice

Lessux, G. G.*; Sakai, Hironori   ; Hattori, Taisuke*; Tokunaga, Yo  ; Kambe, Shinsaku  ; Kuhns, P. L.*; Reyes, A. P.*; Thompson, J. D.*; Pagliuso, P. G.*; Urbano, R. R.*

CeRhIn$$_5$$ is a Kondo-lattice prototype in which a magnetic field $$B^{ast}$$ $$simeq$$ 31T induces an abrupt Fermi-surface (FS) reconstruction and pronounced in-plane electrical transport anisotropy all within its antiferromagnetic state. Here we report low-temperature nuclear magnetic resonance (NMR) measurements revealing a pronounced decrease in the $$^{115}$$In formal Knight shift, without changes in crystal or magnetic structures, of CeRhIn$$_5$$ at fields ($$||c$$) spanning $$B^{ast}$$. We discuss the emergent state above $$B^{ast}$$ in terms of a change in Ce's 4$$f$$ orbitals that arises from field-induced evolution of crystal-electric field (CEF) energy levels. This change in orbital character enhances hybridization between the 4$$f$$ and the conduction electrons that leads ultimately to an itinerant quantum-critical point at $$B_{c0}$$ $$simeq$$ 50T.



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Category:Materials Science, Multidisciplinary



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