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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Vanishing RKKY interactions in Ce-based cage compounds.

A M Konic1, Y Zhu2,3, A J Breindel2,3

  • 1Department of Physics, Kent State University, Kent, OH 44242, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 14, 2023
PubMed
Summary
This summary is machine-generated.

Thermodynamic measurements reveal the Γ7 doublet as the ground state in cubic Ce-based compounds. This explains the absence of long-range magnetic order at low temperatures due to vanishing Ruderman-Kittel-Kasuya-Yosida interactions.

Keywords:
heavy-fermion materialsmagnetic long-range orderstrongly correlated electronic systems

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Magnetism

Background:

  • Cubic Ce-based cage compounds (CeT2Cd20, T=Ni, Pd) are investigated for their magnetic properties.
  • Understanding the ground state and interactions in these materials is crucial for predicting their magnetic behavior.

Purpose of the Study:

  • To determine the ground state multiplet of Ce3+ ions in CeT2Cd20 compounds.
  • To investigate the role of Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in the absence of long-range magnetic order.

Main Methods:

  • Thermodynamic measurements, specifically heat capacity, were performed in an external magnetic field.
  • Analysis of heat-capacity data to identify the ground state and excited states.

Main Results:

  • The Γ7 doublet was identified as the ground state multiplet for Ce3+ ions.
  • Theoretical analysis indicates that the RKKY interaction vanishes at low temperatures for the Γ7 ground state.

Conclusions:

  • The vanishing RKKY interaction in CeT2Cd20 compounds explains the lack of observed long-range magnetic order down to millikelvin temperatures.
  • These findings contribute to the understanding of quantum criticality and frustrated magnetism in Ce-based intermetallic compounds.