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Absence of superconductivity in electron-doped chromium pnictides ThCrAsN$_{1-x}$O$_x$
- Source :
- Phys. Rev. B 108, 064503 (2023)
- Publication Year :
- 2023
-
Abstract
- Theoretical studies predicted possible superconductivity in electron-doped chromium pnictides isostructural to their iron counterparts. Here, we report the synthesis and characterization of a new ZrCuSiAs-type Cr-based compound ThCrAsN, as well as its oxygen-doped variants. All samples of ThCrAsN$_{1-x}$O$_x$ show metallic conduction, but no superconductivity is observed above 30 mK even though the oxygen substitution reaches 75\%. The magnetic structure of ThCrAsN is determined to be G-type antiferromagnetic by magnetization measurements and first-principles calculations jointly. The calculations also indicate that the in-plane Cr--Cr direct interaction of ThCrAsN is robust against the heavy electron doping. The calculated density of states of the orbital occupations of Cr for ThCrAs(N,O) is strongly spin-polarized. Our results suggest the similarities between chromium pnictides and iron-based superconductors shouldn't be overestimated.
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 108, 064503 (2023)
- Publication Type :
- Report
- Accession number :
- edsarx.2308.05267
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.108.064503