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Related Experiment Videos

Test for interlayer coherence in a quasi-two-dimensional superconductor.

John Singleton1, P A Goddard, A Ardavan

  • 1National High Magnetic Field Laboratory, LANL, MS-E536, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|January 22, 2002
PubMed
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Investigating the layered superconductor kappa-(BEDT-TTF)2Cu(NCS)2 reveals its Fermi surface extends interlayer. This suggests interlayer incoherence, though the criterion

Area of Science:

  • Condensed matter physics
  • Superconductivity research
  • Materials science

Background:

  • Layered organic superconductors like kappa-(BEDT-TTF)2Cu(NCS)2 exhibit complex electronic properties.
  • Understanding interlayer coupling is crucial for characterizing their superconducting mechanisms.

Purpose of the Study:

  • To investigate the Fermi surface extension and interlayer transfer integral in kappa-(BEDT-TTF)2Cu(NCS)2.
  • To evaluate the criterion for interlayer incoherence in anisotropic superconductors.

Main Methods:

  • Magnetoresistivity measurements were performed in high magnetic fields (up to 45 T).
  • Magnetic fields were applied parallel to the layers of the material.
  • Analysis focused on identifying peaks in magnetoresistivity to probe electronic structure.

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Main Results:

  • Peaks in magnetoresistivity indicate the Fermi surface extends in the interlayer direction.
  • The interlayer transfer integral (t⊥) was deduced to be approximately 0.04 meV.
  • The quasiparticle scattering rate (τ−1) suggests a condition (ħ/τ ≈ 6t⊥) often linked to interlayer incoherence.

Conclusions:

  • The results suggest kappa-(BEDT-TTF)2Cu(NCS)2 may exhibit interlayer incoherence based on a common criterion.
  • The study questions the universal applicability of the interlayer incoherence criterion for anisotropic materials.
  • Further research is needed to refine criteria for interlayer electronic behavior in such systems.