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Updated: Aug 4, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
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Unusually strong electronic correlation and field-induced ordered phase in YbCo2
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.
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.
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