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  Visualizing the Kondo lattice crossover in YbRh2Si2 with Compton scattering

Güttler, M., Kummer, K., Kliemt, K., Krellner, C., Seiro, S., Geibel, C., et al. (2021). Visualizing the Kondo lattice crossover in YbRh2Si2 with Compton scattering. Physical Review B, 103(11): 115126, pp. 1-12. doi:10.1103/PhysRevB.103.115126.

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 Creators:
Güttler, M.1, Author
Kummer, K.1, Author
Kliemt, K.1, Author
Krellner, C.1, Author
Seiro, S.1, Author
Geibel, C.2, Author              
Laubschat, C.1, Author
Kubo, Y.1, Author
Sakurai, Y.1, Author
Vyalikh, D.V.1, Author
Koizumi, A.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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Free keywords: Coherent scattering, Compton scattering, Magnetic fields, Quantum entanglement, Rare earths, Rhodium compounds, Silicon, Silicon compounds, Conduction state, Cross-over phenomena, Direct observations, Elevated temperature, High magnetic fields, Kondo scattering, Rising temperatures, Zero magnetic fields, Ytterbium compounds
 Abstract: With the breakdown of coherent Kondo scattering with rising temperature, the Fermi surface (FS) in rare-earth Kondo lattices is expected to transition from the large FS counting the 4f moments, which form entangled quasiparticles with strongly enhanced effective masses with the conduction states, to the small FS with decoupled and localized 4f moments. A direct observation of this transition with temperature has, however, remained elusive, because conventional probes of the FS in Kondo lattices require high magnetic fields, which might reconstruct the FS or cannot work reliably at elevated temperatures. Using high-resolution Compton scattering, we overcome these limitations and show that the FS topology in the prototypical Kondo lattice YbRh2Si2 undergoes pronounced changes between 14 and 300 K in zero magnetic field. In particular, we present clear evidence for a largely restored small FS at room temperature. Our results suggest the relevant energy scale of the complex Kondo crossover phenomenon in YbRh2Si2. © 2021 American Physical Society.

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Language(s): eng - English
 Dates: 2021-03-152021-03-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.103.115126
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 103 (11) Sequence Number: 115126 Start / End Page: 1 - 12 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008