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Superconductivity of noncentrosymmetric Na11Hg52 and A11−xHg54+x (A = Ca or Sr) compounds

Rachel Nixon1,2, Nazar Zaremba1, Lev Akselrud1,3, Yurii Prots1, Mitja Krnel1, Andreas Leithe-Jasper1, Tomasz Klimczuk4,5, and Eteri Svanidze1,*

  • *Contact author: svanidze@cpfs.mpg.de
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Phys. Rev. B 113, 184517 – Published 22 May, 2026

DOI: https://doi.org/10.1103/7svx-g894

Abstract

Noncentrosymmetric crystal structures are of significant interest due to the peculiar physical phenomena they frequently promote. Among mercury-based compounds, only a few noncentrosymmetric materials are known, with the vast majority remaining unexplored. In this work, we examine the family of noncentrosymmetric mercurides Na11Hg52 and A11−xHg54+x (A = Ca or Sr). All three materials are identified as new superconductors. The values of the critical temperatures are fairly modest, ranging from 1.7 K (Ca11−xHg54+x) to 3.1 K (Na11Hg52). We postulate that the superconductivity of noncentrosymmetric Na11Hg52 and A11−xHg54+x (A = Ca or Sr) compounds is likely conventional.

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Phys. Rev. B 113, 184517– Published 22 May, 2026
  • Received 7 February 2026
  • Revised 25 March 2026
  • Accepted 15 April 2026
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