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Heavy fermion materials exhibit hidden-order phases, like in CeB6, which are now understood to stem from Fermi surface instability. This instability is driven by itinerant electrons, offering new insights into these elusive electronic states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Heavy fermion materials can exhibit complex
  • hidden-order phases
  • whose origins are often debated.
  • Cerium hexaboride (CeB6) is a model system for studying these phenomena due to its simple structure.

Purpose of the Study:

  • To elucidate the microscopic origin of the hidden-order phase in CeB6.
  • To investigate the role of itinerant electrons in mediating this phase.
  • To provide a framework for studying similar hidden-order phenomena in f-electron systems.

Main Methods:

  • Detailed electronic structure investigation using 3D tomographic angle-resolved photoemission spectroscopy (ARPES).
  • Comparison of experimental findings with inelastic neutron scattering (INS) data.
  • Analysis of Fermi surface instabilities.

Main Results:

  • The hidden-order phase in CeB6 is demonstrated to originate from a Fermi surface instability.
  • Itinerant electrons are identified as the key mediators of this hidden order.
  • ARPES and INS data provide a comprehensive picture of the electronic behavior.

Conclusions:

  • The hidden order in CeB6 is driven by electronic instabilities, not solely localized moments.
  • This finding offers a new paradigm for understanding hidden-order phases in f-electron systems.
  • Itinerant electron behavior is crucial for orbital or spin order in certain materials.