Three superconducting phases discovered in K2Cr3As3 reveal spin-triplet topological properties

[Submitted on 23 Jun 2026]

12h ago· 2 min readenNews

Summary

This article reports a nuclear magnetic resonance study of the Cr-based superconductor K2Cr3As3, which exhibits spin-triplet superconductivity — a rare and fundamentally important quantum state. The researchers discovered three distinct superconducting phases (A, B, and C) with different paired-spin configurations (d(k)-vector orientations) and gap structures (point nodes vs. line nodes). K2Cr3As3 has a relatively high transition temperature of 6.2 K and lacks magnetic order, making it a cleaner platform than uranium-based alternatives. The findings establish this material as a model spin-triplet superconductor and a promising platform for manipulating topological phases relevant to fault-tolerant quantum computing.

Source

bskyThree superconducting phases discovered in K2Cr3As3 reveal spin-triplet topological propertiesarxiv.org

Key quotes

· 4 pulled

Here we report a hallmark signature of spin-triplet superconductivity arising from the internal spin degrees of freedom via nuclear magnetic resonance measurements, and demonstrate the high tunability of the topological phases.

We discovered three distinct superconducting phases and revealed the evolution of the paired-spins direction (d(k)-vector).

These findings establish K2Cr3As3 as a model spin-triplet superconductor and a promising platform for manipulating topological phases.

The Cr-based candidate K2Cr3As3 offers a promising alternative: it has a much higher Tc of 6.2 K and no magnetic order.

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Spin-triplet topological superconductors are rare but of fundamental interest as they can host Majorana bound states that can be used in fault-tolerant quantum computing. Recent efforts have been devoted to searching for spin-triplet states in U-based com

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