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Single-Site Non-Fermi-Liquid Behaviors in a Diluted 4f^{2} System Y_{1-x}Pr_{x}Ir_{2}Zn_{20}.

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Antiferroquadrupolar ordering in a Pr-based superconductor PrIr(2)Zn(20).

T Onimaru1, K T Matsumoto, Y F Inoue

  • 1Department of Quantum Matter, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan. onimaru@hiroshima-u.ac.jp

Physical Review Letters
|June 4, 2011
PubMed
Summary

Researchers discovered antiferroquadrupolar ordering in the Pr-based superconductor PrIr2Zn20. This ordering, linked to quadrupolar degrees of freedom, may influence superconductivity formation.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • Pr-based intermetallic compounds are known for complex magnetic and electronic properties.
  • Superconductivity in heavy fermion systems often arises from magnetic or quadrupolar ordering.
  • Understanding the interplay between magnetic order and superconductivity is crucial for novel material design.

Purpose of the Study:

  • To investigate the nature of the ordering transition in PrIr2Zn20.
  • To determine the ground state properties and the role of quadrupolar degrees of freedom.
  • To elucidate the relationship between antiferroquadrupolar ordering and superconductivity.

Main Methods:

  • Specific heat measurements to identify phase transitions and thermodynamic properties.
  • Magnetization measurements to probe magnetic ordering and response to external fields.
  • Analysis of the magnetic field-temperature (B-T) phase diagram.

Main Results:

  • An antiferroquadrupolar ordering was identified at T(Q)=0.11 K in PrIr2Zn20.
  • Specific heat data revealed a sharp peak at T(Q), consistent with a phase transition.
  • The non-Kramers Γ(3) doublet ground state with quadrupolar degrees of freedom was confirmed.
  • The observed B-T phase diagram and the increment of T(Q) in magnetic fields support the antiferroquadrupolar state.
  • A limited entropy release (20% of Rln2) at T(Q) suggests significant quadrupolar fluctuations.

Conclusions:

  • PrIr2Zn20 exhibits an antiferroquadrupolar ordered state below 0.11 K.
  • Quadrupolar fluctuations are suggested to play a role in the formation of superconducting pairs below T(c)=0.05 K.
  • This finding provides insights into the mechanism of unconventional superconductivity in Pr-based materials.