Orbitally defined field-induced electronic state in a Kondo lattice

Abstract

CeRhIn${}_5$ is a Kondo-lattice prototype in which a magnetic field B${}^{\ast }\simeq$ 30 T induces an abrupt Fermi-surface (FS) reconstruction and pronounced in-plane electrical transport anisotropy all within its antiferromagnetic state. Though the antiferromagnetic order at zero field is well-understood, the origin of an emergent state at B${}^{\ast }$ remains unknown due to challenges inherent to probing states microscopically at high fields. Here, we report low-temperature Nuclear Magnetic Resonance (NMR) measurements revealing a discontinuous decrease in the ${}^{115}$In formal Knight shift, without changes in crystal or magnetic structures, of CeRhIn${}_5$ at fields spanning B${}^{\ast }$. We show that the emergent state above B${}^{\ast }$ results from a change in Ce's 4f orbitals that arises from field-induced evolution of crystal-electric field (CEF) energy levels. This change in orbital character enhances hybridisation between the 4f and the conduction electrons (c.e.) that leads ultimately to an itinerant quantum-critical point at B${}_{c0}\simeq$ 50 T.

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• Nuclear Magnetic Resonance in High Magnetic Field: Application to Condensed Matter Physics
• Hyperfine Interactions in the Heavy Fermion CeMIn_5 Systems
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• Enhanced hybridization sets the stage for electronic nematicity in CeRhIn5
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Cited by in corpus (8)

• Field-Induced Lifshitz Transition in the Magnetic Weyl Semimetal Candidate PrAlSi
• Nematic state in CeAuSb${}_2$
• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
• Specific heat of CeRhIn${}_5$ in high magnetic fields: Magnetic phase diagram revisited
• Hyperfine Couplings as a Probe of Orbital Anisotropy in Heavy Fermion Materials
• Origin of the 30 T transition in CeRhIn${}_5$ in tilted magnetic fields
• Robust Fermi-Surface Morphology of CeRhIn${}_5$ across the Putative Field-Induced Quantum Critical Point
• Exotic magnetic phase diagram and extremely robust antiferromagnetism in Ce${}_2$RhIn${}_8$