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Related Concept Videos

Fermi Level01:18

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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantum critical behavior in heavy electron materials.

Yi-feng Yang1, David Pines2

  • 1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Collaborative Innovation Center of Quantum Matter, Beijing 100190, China; and yifeng@iphy.ac.cn david.pines@gmail.com.

Proceedings of the National Academy of Sciences of the United States of America
|June 10, 2014
PubMed
Summary
This summary is machine-generated.

A new model explains how pressure and magnetic fields drive quantum criticality in heavy electron materials. This unified approach accurately describes experimental results for CeCoIn5 and YbRh2Si2.

Keywords:
heavy fermionquantum criticalitytwo-fluid model

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Area of Science:

  • Condensed matter physics
  • Quantum materials research

Background:

  • Heavy electron materials exhibit quantum critical behavior influenced by external parameters like pressure and magnetic fields.
  • Understanding the interplay of these parameters is crucial for characterizing exotic electronic states.

Purpose of the Study:

  • To develop a unified model for the combined effects of pressure and magnetic fields on hybridization in heavy electron systems.
  • To provide a quantitative explanation for observed quantum critical phenomena in specific materials.

Main Methods:

  • Development of a simple, unified theoretical model.
  • Analysis of hybridization effectiveness under combined pressure and magnetic fields.
  • Comparison of model predictions with experimental data for CeCoIn5 and YbRh2Si2.

Main Results:

  • The model successfully predicts quantum critical and delocalization lines, matching experimental data for CeCoIn5.
  • It quantitatively explains field- and pressure-induced changes in antiferromagnetic ordering and quantum criticality in YbRh2Si2.
  • The model offers a framework for understanding magnetic field effects on quantum criticality.

Conclusions:

  • The unified model provides a robust framework for understanding quantum critical behavior in heavy electron materials.
  • It highlights the critical role of hybridization and its modulation by external fields.
  • The findings facilitate predictions and further research into these complex materials.