Distinct behaviors of suppression to superconductivity in LaRu3Si2 induced by Fe and Co dopants
Sheng Li, Jian Tao, Xiangang Wan, Xiaxin Ding, Huan Yang, Hai-Hu Wen
DOI 10.1103/PhysRevB.86.024513 · Physical Review B
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Abstract
In the superconductor LaRu3Si2 with the Kagome lattice of Ru, we have successfully doped the Ru with Fe and Co atoms. Contrasting behaviors of suppression to superconductivity are discovered between the Fe and the Co dopants: Fe impurities can suppress the superconductivity completely at a doping level of only 3%, while the superconductivity is suppressed slowly with the Co dopants. Systematic magnetization measurements indicate that the doped Fe impurities lead to spin-polarized electrons yielding magnetic moments with a magnitude of 1.5 μB Fe, while the electrons given by the Co dopants have the same density of states for spin up and spin down, leading to much weaker magnetic moments. It is the strong local magnetic moments given by the Fe dopants that suppress the superconductivity. The band-structure calculation further supports this conclusion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure not reported | unknown |
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