1. Absence of superconductivity in electron-doped chromium pnictides ThCrAsN$_{1-x}$O$_x$
- Author
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Wang, Zhi-Cheng, Shao, Ye-Ting, Lin, Yi-Qiang, Song, Shi-Jie, Li, Bai-Zhuo, Cheng, Er-Jian, Li, Shi-Yan, Zhu, Qin-Qing, Ren, Zhi, and Cao, Guang-Han
- Subjects
Condensed Matter - Superconductivity ,Condensed Matter - Materials Science ,Condensed Matter - Strongly Correlated Electrons - 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.
- Published
- 2023
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