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Isotropic quantum scattering and unconventional superconductivity.

T Park1, V A Sidorov, F Ronning

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. tuson@lanl.gov

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|November 21, 2008
PubMed
Summary
This summary is machine-generated.

Unconventional superconductivity arises from quantum fluctuations at a local quantum critical point, not phonons. This discovery in CeRhIn(5) reveals new mechanisms for electron pairing in strongly correlated materials.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity

Background:

  • Conventional superconductivity is mediated by phonons.
  • Unconventional superconductivity is proposed to arise from magnetic fluctuations in strongly correlated electron systems near magnetic instabilities.
  • Identifying novel pairing mechanisms is crucial for understanding high-temperature superconductivity.

Purpose of the Study:

  • To investigate superconductivity mediated by fluctuations beyond phonons.
  • To explore the role of local quantum critical points in unconventional superconductivity.
  • To identify new sources of electron pairing in quantum materials.

Main Methods:

  • Studying the strongly correlated antiferromagnet CeRhIn(5) under pressure.
  • Analyzing electronic scattering and electrical resistivity.
  • Investigating quantum fluctuations at a local quantum critical point.

Main Results:

  • Superconductivity was observed to arise from a local quantum critical point, distinct from phonon-mediated mechanisms.
  • Isotropic scattering of charge carriers and sublinear, temperature-dependent resistivity were key indicators.
  • Coexisting magnetic and charge fluctuations at the critical point were found to be maximal at the optimal pressure for superconductivity.

Conclusions:

  • A novel source of pairing glue for superconductivity, originating from local quantum critical point fluctuations, has been identified.
  • This finding expands the understanding of unconventional superconductivity mechanisms.
  • It opens new avenues for discovering and engineering novel superconducting materials.