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Low-frequency spin dynamics in the CeMIn5 materials.

N J Curro1, J L Sarrao, J D Thompson

  • 1Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|July 15, 2003
PubMed
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We studied spin dynamics in CeMIn5 materials, finding a crossover from "Kondo gas" to "Kondo liquid" behavior. This reveals insights into quantum criticality and the emergence of superconductivity and antiferromagnetism.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • CeMIn5 materials exhibit complex electronic properties.
  • Understanding the interplay between magnetism and superconductivity is crucial.

Purpose of the Study:

  • To investigate the low-energy spin dynamics in CeRhIn5 and CeCoIn5.
  • To identify the nature of the normal state and its relation to emergent ground states.

Main Methods:

  • Spin lattice relaxation measurements of planar In(1) nuclei.
  • Analysis of temperature-dependent spin dynamics.

Main Results:

  • A crossover temperature T(*) was identified in the normal state.
  • Above T(*), Ce moments behave as a 'Kondo gas'; below T(*), they form a 'Kondo liquid'.

Related Experiment Videos

  • Both antiferromagnetic and superconducting states emerge from the 'Kondo liquid' regime.

    • Conclusions:

    • The 'Kondo liquid' regime is essential for the emergence of exotic ground states in CeMIn5.
    • Strong evidence for quantum criticality in CeCoIn5 was found.