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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Anomalous upper critical field in CeCoIn5/YbCoIn5 superlattices with a Rashba-type heavy Fermion interface.

S K Goh1, Y Mizukami, H Shishido

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto, Japan.

Physical Review Letters
|October 30, 2012
PubMed
Summary

We observed unusual magnetic field responses in CeCoIn(5)/YbCoIn(5) superlattices. A cusp in the upper critical field suggests exotic superconducting states may form under specific conditions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Heavy-fermion superconductors like CeCoIn(5) exhibit strong electronic correlations.
  • Superlattices provide a platform to tune material properties by controlling layer thickness.
  • The interplay between Pauli and orbital effects governs the upper critical field in superconductors.

Purpose of the Study:

  • To investigate the angular dependence of the upper critical field (H(c2)) in CeCoIn(5)/YbCoIn(5) superlattices.
  • To understand the influence of layer thickness on superconducting properties.
  • To explore the possibility of exotic superconducting states in these engineered materials.

Main Methods:

  • Fabrication of epitaxial superlattices with varying CeCoIn(5) layer thickness (n).
  • Measurement of the upper critical field (H(c2)) as a function of magnetic field angle (θ).
  • Analysis of the temperature dependence of H(c2)(θ) to probe underlying physics.

Main Results:

  • The n=3 superlattice exhibited a unique cusp in H(c2)(θ) near the superconducting transition temperature at parallel field.
  • This cusp behavior was absent in n=4 and n=5 superlattices.
  • The results indicate a shift in the dominant depairing mechanism with varying layer thickness.

Conclusions:

  • The observed angular variation of H(c2) suggests the dominance of orbital depairing in the n=3 superlattice, possibly due to suppressed Pauli effect.
  • Local inversion symmetry breaking may play a role in the observed phenomena.
  • Exotic superconducting states, potentially including helical states, may be realized at high magnetic fields.