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Giannakis I, Leshen J, Kavai M, Ran S, Kang CJ, Saha SR, Zhao Y, Xu Z, Lynn JW, Miao L, Wray LA, Kotliar G, Butch NP, Aynajian P. Orbital-selective Kondo lattice and enigmatic f electrons emerging from inside the antiferromagnetic phase of a heavy fermion. SCIENCE ADVANCES 2019; 5:eaaw9061. [PMID: 31667341 PMCID: PMC6799987 DOI: 10.1126/sciadv.aaw9061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 09/25/2019] [Indexed: 05/25/2023]
Abstract
Novel electronic phenomena frequently form in heavy-fermions because of the mutual localized and itinerant nature of f-electrons. On the magnetically ordered side of the heavy-fermion phase diagram, f-moments are expected to be localized and decoupled from the Fermi surface. It remains ambiguous whether Kondo lattice can develop inside the magnetically ordered phase. Using spectroscopic imaging with scanning tunneling microscope, complemented by neutron scattering, x-ray absorption spectroscopy, and dynamical mean field theory, we probe the electronic states in antiferromagnetic USb2. We visualize a large gap in the antiferromagnetic phase within which Kondo hybridization develops below ~80 K. Our calculations indicate the antiferromagnetism and Kondo lattice to reside predominantly on different f-orbitals, promoting orbital selectivity as a new conception into how these phenomena coexist in heavy-fermions. Finally, at 45 K, we find a novel first order-like transition through abrupt emergence of nontrivial 5f-electronic states that may resemble the "hidden-order" phase of URu2Si2.
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Affiliation(s)
- Ioannis Giannakis
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, NY 13902, USA
| | - Justin Leshen
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, NY 13902, USA
| | - Mariam Kavai
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, NY 13902, USA
| | - Sheng Ran
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - Chang-Jong Kang
- Department of Physics and Astronomy, Rutgers University, NJ 08854, USA
| | - Shanta R. Saha
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - Y. Zhao
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
| | - Z. Xu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - J. W. Lynn
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Lin Miao
- Department of Physics, New York University, New York, NY 10003, USA
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - L. Andrew Wray
- Department of Physics, New York University, New York, NY 10003, USA
| | - Gabriel Kotliar
- Department of Physics and Astronomy, Rutgers University, NJ 08854, USA
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Nicholas P. Butch
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, USA
| | - Pegor Aynajian
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, NY 13902, USA
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