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Pauli-limited multiband superconductivity in KFe2As2.

D A Zocco1, K Grube, F Eilers

  • 1Institute for Solid State Physics, IFP, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany. diego.zocco@kit.edu

Physical Review Letters
|August 20, 2013
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Summary
This summary is machine-generated.

Pauli limiting effects significantly influence the upper critical field in the multiband superconductor KFe2As2. This study confirms Pauli limiting in multiband superconductors for the first time.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • KFe2As2 is a notable multiband superconductor.
  • Understanding the upper critical field (H(c2)(T)) is crucial for superconductor applications.

Purpose of the Study:

  • To investigate the Pauli limiting effects on the upper critical field of KFe2As2.
  • To determine the influence of magnetic field orientation on these effects.

Main Methods:

  • Low-temperature thermal expansion measurements.
  • Magnetostriction measurements down to 50 mK.
  • Modeling of Pauli limits for single-band and multiband superconductors.

Main Results:

  • Evidence of Pauli limiting effects dominating H(c2)(T) for magnetic fields parallel to the 'a' axis (H || a).
  • Observed a crossover from second- to first-order phase transitions in magnetostriction for H || a.
  • Absence of corresponding features for magnetic fields parallel to the 'c' axis (H || c).

Conclusions:

  • This study provides the first confirmation of Pauli limiting in a multiband superconductor.
  • Pauli limiting effects are strongly dependent on the crystallographic orientation of the applied magnetic field in KFe2As2.