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Spin-Polarized Josephson Supercurrent in Nodeless Altermagnets.

Chuang Li1,2, Jin-Xing Hou2,3, Fu-Chun Zhang4

  • 1Zhejiang University, Center for Correlated Matter and School of Physics, Hangzhou 310058, China.

Physical Review Letters
|April 3, 2026
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Summary

We discovered a new way to create supercurrents using spin-triplet pairings in altermagnetic materials without net magnetization. This opens doors for novel spintronic devices and advanced superconducting applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Long-range propagation of equal-spin triplet Cooper pairs is typically observed in ferromagnet-superconductor junctions, relying on net magnetization.
  • Existing Josephson junctions primarily utilize spin-singlet pairing or require magnetic fields.

Purpose of the Study:

  • To propose and investigate a novel mechanism for Josephson supercurrents mediated exclusively by spin-triplet pairings.
  • To identify suitable material platforms for achieving magnetization-free spin-triplet supercurrents.

Main Methods:

  • Theoretical proposal of Josephson junctions based on collinear altermagnets, specifically nodeless altermagnets.
  • Analysis of spin-split Fermi surfaces and spin-valley polarization in these materials.
  • Investigation of Cooper pair correlations and control over 0-π transitions.

Main Results:

  • Identified nodeless altermagnets as ideal platforms for generating Josephson supercurrents via spin-triplet pairing without net magnetization.
  • Demonstrated that these junctions sustain supercurrents through spin-up and spin-down Cooper pairs from different valleys.
  • Showcased robust 0-π transitions and tunable singlet-triplet mixing by controlling interface properties and junction orientation.

Conclusions:

  • Nodeless altermagnets provide a unique platform for realizing magnetization-free, spin-polarized supercurrents.
  • This work establishes a new paradigm for spintronic devices and superconducting applications.
  • The findings pave the way for novel functionalities in Josephson junctions based on altermagnetic materials.