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Phase-sensitive order parameter symmetry test experiments utilizing Nd(2-x)Ce(x)CuO(4-y)/Nb zigzag junctions.

Ariando1, D Darminto, H-J H Smilde

  • 1Technology and MESA+ Research Institute [corrected] University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Physical Review Letters
|May 24, 2005
PubMed
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Experiments on electron-doped cuprates show a predominant d(x2-y2)-wave symmetry in Josephson structures. This symmetry persists even at lower temperatures, indicating robust superconducting properties in Nd(2-x)Ce(x)CuO(4-y).

Area of Science:

  • Condensed Matter Physics
  • Superconductivity Research
  • Materials Science

Background:

  • Electron-doped high-temperature cuprates (high-T(c)) like Nd(2-x)Ce(x)CuO(4-y) exhibit complex superconducting properties.
  • Understanding the order parameter symmetry is crucial for explaining high-T(c) superconductivity mechanisms.

Purpose of the Study:

  • To perform phase-sensitive tests of the order parameter symmetry in electron-doped Nd(2-x)Ce(x)CuO(4-y).
  • To investigate the temperature dependence of the superconducting order parameter symmetry.

Main Methods:

  • Utilized zigzag-shaped thin film Josephson structures.
  • Fabricated structures by connecting Nd(2-x)Ce(x)CuO(4-y) to a low-T(c) superconductor (Nb) via an gold (Au) barrier layer.
  • Conducted phase-sensitive measurements at T=4.2 K and T=1.6 K.

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Main Results:

  • Observed a clear, predominant d(x2-y2)-wave symmetry for both optimally doped and overdoped Nd(2-x)Ce(x)CuO(4-y) at 4.2 K.
  • Found no evidence for a transition to s-wave symmetry upon decreasing temperature to 1.6 K.
  • The d(x2-y2)-wave symmetry remained dominant across the investigated temperature range.

Conclusions:

  • The superconducting order parameter in electron-doped Nd(2-x)Ce(x)CuO(4-y) exhibits predominantly d(x2-y2)-wave symmetry.
  • This symmetry is stable and does not change to s-wave symmetry with decreasing temperature.
  • The findings provide critical insights into the nature of superconductivity in these materials.