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Lifshitz transition from valence fluctuations in YbAl3

Author

Listed:
  • Shouvik Chatterjee

    (Cornell University
    University of California)

  • Jacob P. Ruf

    (Cornell University)

  • Haofei I. Wei

    (Cornell University)

  • Kenneth D. Finkelstein

    (Cornell University)

  • Darrell G. Schlom

    (Cornell University
    Kavli Institute at Cornell for Nanoscale Science)

  • Kyle M. Shen

    (Cornell University
    Kavli Institute at Cornell for Nanoscale Science)

Abstract

In mixed-valent Kondo lattice systems, such as YbAl3, interactions between localized and delocalized electrons can lead to fluctuations between two different valence configurations with changing temperature or pressure. The impact of this change on the momentum-space electronic structure is essential for understanding their emergent properties, but has remained enigmatic. Here, by employing a combination of molecular beam epitaxy and in situ angle-resolved photoemission spectroscopy we show that valence fluctuations can lead to dramatic changes in the Fermi surface topology, even resulting in a Lifshitz transition. As the temperature is lowered, a small electron pocket in YbAl3 becomes completely unoccupied while the low-energy ytterbium (Yb) 4f states become increasingly itinerant, acquiring additional spectral weight, longer lifetimes, and well-defined dispersions. Our work presents a unified picture of how local valence fluctuations connect to momentum-space concepts such as band filling and Fermi surface topology in mixed valence systems.

Suggested Citation

  • Shouvik Chatterjee & Jacob P. Ruf & Haofei I. Wei & Kenneth D. Finkelstein & Darrell G. Schlom & Kyle M. Shen, 2017. "Lifshitz transition from valence fluctuations in YbAl3," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00946-1
    DOI: 10.1038/s41467-017-00946-1
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