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Unusually strong electronic correlation and field-induced ordered phase in YbCo2.

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  • 1International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 4, 2023
PubMed
Summary

This study on Ytterbium cobaltide (YbCo2) reveals no magnetic ordering at low temperatures, but strong correlations near a quantum critical point. Field-induced transitions suggest proximity to ferromagnetic behavior.

Keywords:
Kondo effectYb-compoundsheavy fermionmagnetic transitionrare-earth element

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Ytterbium cobaltide (YbCo2) is a material exhibiting complex magnetic and electronic properties.
  • Understanding the interplay between localized 4f electrons and itinerant 3d electrons is crucial for materials with potential quantum critical behavior.

Purpose of the Study:

  • To investigate the low-temperature physical properties of YbCo2, including electrical resistivity, magnetization, and specific heat.
  • To determine the magnetic ordering, Kondo temperature, and electronic specific heat contributions.
  • To explore the influence of magnetic fields on the material's properties and its proximity to a quantum critical point.

Main Methods:

  • Single-crystal YbCo2 was synthesized and characterized.
  • Measurements of electrical resistivity, magnetization, and specific heat were performed from 0.3 K to room temperature.
  • Temperature-dependent measurements were conducted under static magnetic fields up to 7 Tesla.

Main Results:

  • No evidence of magnetic ordering was observed down to 0.3 K in zero magnetic field.
  • Manifestations of a low Kondo temperature and a large electronic specific heat were detected, increasing logarithmically with decreasing temperature.
  • Strong intersite magnetic correlations in both 3d and 4f electrons were identified as a significant factor in the low-temperature specific heat.
  • Field-induced transitions with ferromagnetic character were observed above 2 T, with transition temperature increasing with field.
  • Extrapolation suggests YbCo2 is near a quantum critical point.

Conclusions:

  • YbCo2 exhibits characteristics of a low Kondo temperature and strong magnetic correlations, rather than conventional magnetic ordering at low temperatures.
  • The material is in close proximity to a quantum critical point, influenced by both itinerant Co 3d-electron magnetism and Yb 4f-electron Kondo effects.
  • YbCo2 serves as a unique system for studying the interplay of Kondo physics and itinerant electron magnetism near quantum criticality.