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<p>We demonstrate that soft fluctuations of translation symmetry-breaking loop currents provide a mechanism for unconventional superconductivity in kagome metals that naturally addresses the multiple superconducting phases observed under pressure. Focusing on the rich multi-orbital character of these systems, we show that loop currents involving both vanadium and antimony orbitals generate low-energy collective modes that couple efficiently to electrons near the Fermi surface and mediate attractive interactions in two distinct unconventional pairing channels. While loop-current fluctuations confined to vanadium orbitals favor chiral <i>d</i>&#xa0;+&#xa0;<i>i</i><i>d</i> superconductivity, which spontaneously breaks time-reversal symmetry, the inclusion of antimony orbitals stabilizes an <i>s</i><sup>±</sup> state that is robust against disorder. We argue that these two states are realized experimentally as pressure increases and the antimony-dominated Fermi surface sheet undergoes a Lifshitz transition.</p>

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Superconductivity in kagome metals due to soft loop-current fluctuations

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月21日

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  • Daniel J. Schultz,
  • Grgur Palle,
  • Asimpunya Mitra,
  • Yong Baek Kim,
  • Rafael M. Fernandes,
  • Jörg Schmalian

摘要

We demonstrate that soft fluctuations of translation symmetry-breaking loop currents provide a mechanism for unconventional superconductivity in kagome metals that naturally addresses the multiple superconducting phases observed under pressure. Focusing on the rich multi-orbital character of these systems, we show that loop currents involving both vanadium and antimony orbitals generate low-energy collective modes that couple efficiently to electrons near the Fermi surface and mediate attractive interactions in two distinct unconventional pairing channels. While loop-current fluctuations confined to vanadium orbitals favor chiral d + id superconductivity, which spontaneously breaks time-reversal symmetry, the inclusion of antimony orbitals stabilizes an s± state that is robust against disorder. We argue that these two states are realized experimentally as pressure increases and the antimony-dominated Fermi surface sheet undergoes a Lifshitz transition.