Different response of superconductivity to the transition-metal impurities in K0.8Fe2−y−xMxSe2 (M = Cr, Mn, Co, Zn)
Dian Tan, Changjin Zhang, Chuanying Xi, Langsheng Ling, Lei Zhang, Wei Tong, Yi Yu, Guolin Feng, Hongyan Yu, Li Pi, Zhaorong Yang, Shun Tan, Yuheng Zhang
DOI 10.1103/PhysRevB.84.014502 · Physical Review B
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Abstract
In this paper, we perform Fe-site substitution experiments on K0.8Fe2−ySe2 superconductor by choosing Cr, Mn, Co, and Zn as dopants. It is found that the doping of Cr, Co, and Zn leads to a drastic depression of superconductivity, while the introduction of Mn does not decrease the superconducting transition temperature (Tc) when x⩽0.067. Electron-spin-resonance measurements reveal the existence of strong magnetic fluctuation in both the parent compound and the doped samples. In the Cr-, Co-, and Zn-doped samples, the magnetic pair-breaking effect severely affects the superconductivity, resulting in drastic depression of superconductivity. On the other hand, in the Mn-doped case, it does not break the cooper pairs and thus hardly affects the Tc value.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K0.8Fe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.5 | Pressure not reported | onset |
| K0.8Fe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.5 | Pressure not reported | onset |
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