Superconductivity of noncentrosymmetric Na11Hg52 and A11−xHg54+x (A = Ca or Sr) compounds
Rachel Nixon, Nazar Zaremba, Lev Akselrud, Yurii Prots, Mitja Krnel, Andreas Leithe-Jasper, Tomasz Klimczuk, Eteri Svanidze
DOI 10.1103/7svx-g894 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na11Hg52 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.1 | Pressure not reported | unknown |
| Ca11-xHg54+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.7 | Pressure not reported | unknown |
| Ca10Hg55 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.74 | Pressure not reported | midpoint |
| Sr11-xHg54+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | unknown |
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