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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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Controlling superconductivity by tunable quantum critical points.

S Seo1, E Park1, E D Bauer2

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This summary is machine-generated.

Quantum critical points in heavy fermion compounds like CeRhIn5 can be tuned. Fluctuations near antiferromagnetic quantum criticality surprisingly promote unconventional superconductivity, even with high impurity scattering.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity

Background:

  • Heavy fermion compounds, such as CeRhIn5, exhibit complex electronic behaviors near quantum critical points.
  • Understanding the role of quantum fluctuations in superconductivity formation is crucial but challenging due to limited examples.
  • CeRhIn5 presents a unique case where a local quantum critical point is associated with superconductivity.

Purpose of the Study:

  • To investigate the precise control of superconductivity by tunable quantum critical points in CeRhIn5.
  • To explore the influence of antiferromagnetic quantum criticality on unconventional superconductivity.
  • To examine the impact of tin substitution on the quantum critical point and superconductivity in CeRhIn5.

Main Methods:

  • Utilized tin (Sn) substitution for indium (In) in the CeRhIn5 crystal structure.
  • Precisely controlled the antiferromagnetic quantum critical point pressure via tin doping.
  • Measured superconducting properties under varying pressure and impurity scattering conditions.

Main Results:

  • Tin substitution shifted the antiferromagnetic quantum critical point from 2.3 GPa to 1.3 GPa.
  • Introduced significant residual impurity scattering (300x larger than pure CeRhIn5), expected to suppress superconductivity.
  • Observed the emergence of superconductivity precisely at the tuned quantum critical point in tin-doped CeRhIn5.

Conclusions:

  • Quantum fluctuations associated with antiferromagnetic quantum criticality play a crucial role in promoting unconventional superconductivity.
  • Superconductivity can persist and even emerge at quantum critical points despite substantial impurity scattering.
  • CeRhIn5 serves as a key material for studying the interplay between quantum criticality and superconductivity.