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  Anisotropy-driven quantum criticality in an intermediate valence system

Grbić, M. S., O'Farrell, E. C. T., Matsumoto, Y., Kuga, K., Brando, M., Küchler, R., et al. (2022). Anisotropy-driven quantum criticality in an intermediate valence system. Nature Communications, 13(1): 2141, pp. 1-8. doi:10.1038/s41467-022-29757-9.

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 Creators:
Grbić, Mihael S.1, Author
O'Farrell, Eoin C. T.1, Author
Matsumoto, Yosuke1, Author
Kuga, Kentaro1, Author
Brando, Manuel2, Author              
Küchler, Robert3, Author              
Nevidomskyy, Andriy H.1, Author
Yoshida, Makoto1, Author
Sakakibara, Toshiro1, Author
Kono, Yohei1, Author
Shimura, Yasuyuki1, Author
Sutherland, Michael L.1, Author
Takigawa, Masashi1, Author
Nakatsuji, Satoru1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863469              
3Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: The nature of quantum criticality in intermetallic f-electron compounds exhibiting valence fluctuations is not well understood. Here, using a combination of experimental techniques, the authors attribute quantum criticality in YbAlB4 to the anisotropic hybridization between the conduction and f-electrons. Intermetallic compounds containing f-electron elements have been prototypical materials for investigating strong electron correlations and quantum criticality (QC). Their heavy fermion ground state evoked by the magnetic f-electrons is susceptible to the onset of quantum phases, such as magnetism or superconductivity, due to the enhanced effective mass (m*) and a corresponding decrease of the Fermi temperature. However, the presence of f-electron valence fluctuations to a non-magnetic state is regarded an anathema to QC, as it usually generates a paramagnetic Fermi-liquid state with quasiparticles of moderate m*. Such systems are typically isotropic, with a characteristic energy scale T-0 of the order of hundreds of kelvins that require large magnetic fields or pressures to promote a valence or magnetic instability. Here we show the discovery of a quantum critical behaviour and a Lifshitz transition under low magnetic field in an intermediate valence compound alpha-YbAlB4. The QC origin is attributed to the anisotropic hybridization between the conduction and localized f-electrons. These findings suggest a new route to bypass the large valence energy scale in developing the QC.

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Language(s): eng - English
 Dates: 2022-04-192022-04-19
 Publication Status: Published in print
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 13 (1) Sequence Number: 2141 Start / End Page: 1 - 8 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723