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Related Experiment Videos

Quantum critical 5f electrons avoid singularities in U(Ru,Rh)2Si2.

A V Silhanek1, N Harrison, C D Batista

  • 1National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|August 11, 2005
PubMed
Summary

Specific heat measurements of Rh-doped URu2Si2 reveal similarities to CeRu2Si2, suggesting shared hybridized-band models. A phase transition indicates strong 5f orbital coupling, possibly electric quadrupolar order.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • URu2Si2 and CeRu2Si2 are isostructural heavy-fermion compounds exhibiting complex magnetic behavior.
  • Metamagnetic transitions in these materials are often associated with quantum criticality.

Purpose of the Study:

  • To investigate the metamagnetic transition in 4% Rh-doped URu2Si2 using specific heat measurements.
  • To compare the behavior of doped URu2Si2 with its Ce analog, CeRu2Si2, around the transition field.

Main Methods:

  • Specific heat measurements were performed on 4% Rh-doped URu2Si2 samples.
  • Measurements were conducted at magnetic fields around the proposed metamagnetic transition field (H(m) ≈ 34 T).

Main Results:

  • Specific heat data for 4% Rh-doped URu2Si2 above H(m) showed striking similarities to CeRu2Si2.

Related Experiment Videos

  • Vanishing bandwidths near H(m) suggest proximity to a quantum-critical point.
  • A phase transition into an ordered phase was observed near H(m) in doped URu2Si2, but not in CeRu2Si2.
  • Irreversible processes at the transition point to strong coupling between 5f orbitals and the lattice.

    • Conclusions:

    • Renormalized hybridized-band models are applicable to both URu2Si2 and CeRu2Si2 systems.
    • The observed phase transition in doped URu2Si2 suggests a stronger superexchange interaction compared to CeRu2Si2.
    • The findings strongly suggest electric quadrupolar order in 4% Rh-doped URu2Si2.