Finite-momentum mixed singlet-triplet pairing in chiral antiferromagnets induced by even-parity spin texture

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2025-09-04

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Department of Applied Physics

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en

Pages

8

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Physical Review B, Volume 112, issue 10, pp. 1-8

Abstract

Nonrelativistic spin splitting in unconventional antiferromagnets has garnered much attention for its promising spintronic applications and open fundamental questions. Here, we uncover a unique even-parity spin texture in chiral noncollinear antiferromagnets, exemplified using a kagome lattice. We consider two distinct types of electrons in the system: one with Schrödinger-like dispersion and the other exhibiting Dirac-like behavior. Remarkably, we show that, for both electron types, this spin texture induces an exotic coexistence of opposite-spin singlet and equal-spin triplet Cooper pairs with finite momentum when proximity coupled to conventional superconductors. The triplet pairing arises from the intrinsic spin rotation of the antiferromagnet and does not require net magnetization or spin-orbit coupling. Moreover, we identify a tunable phase difference between singlet and triplet pairings, controllable through junction orientation. This mixed pairing state can be experimentally probed via damped oscillations in order parameters and 0-π transitions in Josephson junctions. Additionally, we analyze the effect of out-of-plane spin canting, elucidating its role in generating spin-polarized supercurrents, and discuss Mn3Ga and Mn3Ge to test our predictions.

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Publisher Copyright: © 2025 American Physical Society

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DOI

10.1103/8cwk-nynj

Citation

Zhang, S B & Hu, L H 2025, 'Finite-momentum mixed singlet-triplet pairing in chiral antiferromagnets induced by even-parity spin texture', Physical Review B, vol. 112, no. 10, L100501, pp. 1-8. https://doi.org/10.1103/8cwk-nynj

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https://urn.fi/URN:NBN:fi:aalto-202511058699

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[article-cris] Perustieteiden korkeakoulu / SCI