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Hall-effect evolution across a heavy-fermion quantum critical point.

S Paschen1, T Lühmann, S Wirth

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Researchers studied heavy-fermion metals near a quantum critical point (QCP). They found the large Fermi surface collapses suddenly at the QCP, indicating a transformation of the heavy-fermion state.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Quantum critical points (QCPs) significantly influence material properties at finite temperatures.
  • Heavy-fermion metals are crucial for studying antiferromagnetic QCPs.
  • The Fermi surface of heavy-fermion paramagnets is larger than that of antiferromagnets, posing questions about its transformation at QCPs.

Purpose of the Study:

  • Investigate the nature of Fermi surface transformation at an antiferromagnetic quantum critical point.
  • Determine if the transformation is gradual (spin-density-wave) or sudden (heavy electron localization).

Main Methods:

  • Measurements of the low-temperature Hall coefficient (R(H)) in YbRh2Si2.
  • Field-tuning the material from an antiferromagnetic to a paramagnetic state near the QCP.

Main Results:

  • The Hall coefficient (R(H)) showed an increasingly rapid change near the QCP as temperature decreased.
  • Extrapolation to zero temperature indicated a sudden jump in R(H).

Conclusions:

  • The results suggest a sudden collapse of the large Fermi surface at the quantum critical point.
  • This collapse implies a simultaneous localization of heavy electrons and a transformation of the heavy-fermion state.