Orbitally defined field-induced electronic state in a Kondo lattice

G. G. Lesseux, H. Sakai, T. Hattori, Y. Tokunaga, S. Kambe, P. L. Kuhns, A. P. Reyes, J. D. Thompson, P. G. Pagliuso, and R. R. Urbano
Phys. Rev. B 101, 165111 – Published 10 April 2020
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Abstract

CeRhIn5 is a Kondo-lattice prototype in which a magnetic field B*31T 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* 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 pronounced decrease in the In115 formal Knight shift, without changes in crystal or magnetic structures, of CeRhIn5 at fields (c) spanning B*. We discuss the emergent state above B* in terms of 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 hybridization between the 4f and the conduction electrons that leads ultimately to an itinerant quantum-critical point at Bc050T.

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  • Received 12 June 2019
  • Revised 12 March 2020
  • Accepted 13 March 2020

DOI:https://doi.org/10.1103/PhysRevB.101.165111

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

G. G. Lesseux1, H. Sakai2, T. Hattori2, Y. Tokunaga2, S. Kambe2, P. L. Kuhns3, A. P. Reyes3, J. D. Thompson4, P. G. Pagliuso1, and R. R. Urbano1

  • 1Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas, 13083-859, Campinas, SP, Brazil
  • 2Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
  • 3National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
  • 4Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 101, Iss. 16 — 15 April 2020

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