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arXiv 2204.03491cond-mat.supr-con
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离子注入提高铁超导体的超导临界温度

Novel Increase of Superconducting Critical Temperature of an Iron-Superconductor due to Ion Implantation

Kriti R Sahu, Thomas Wolf, A K Mishra, A Banerjee, V Ganesan, Udayan De

摘要:

高能离子辐照通常会降低超导临界温度(Tc),只有少数例外,涉及增加到几个K。然而,我们最近用1.5 MeV Ar 6+以2.5 × 10^15 Ar/cm 2的剂量辐照单晶铁超导体Ba(Fe0.943Co0.057)2As 2,使其Tc从磁化率实部测量的~16.9 K的起始Tc提高了8.2 K,与虚部、电阻率和磁化强度的测量结果相匹配。Ozaki等人(2016)解释了FeSe0.5Te0.5薄膜的Tc增加0.5 K,厚度(t)<辐照质子范围(R),这是由于晶格的辐射损伤产生的纳米级压缩应变。在这里,Ar照射与t > R的结果在我们的晶体中的Ar注入层。注入的惰性气体原子经常聚集成高压气泡,对晶格施加很大的压缩应变。我们认为,这种额外的压缩应变可能是这样一个大的(~49%)Tc增加的原因。

英文摘要:

Energetic ion irradiation usually decreases superconducting critical temperature(Tc), with the few exceptions involving increases up to a few K only. However, our recent 2.5X10^15 Ar/cm2 irradiations by 1.5 MeV Ar6+ enhanced Tc of the single crystal Fe-superconductor Ba(Fe0.943Co0.057)2As2 by 8.2 K from its initial onset Tc of ~16.9 K as measured from the real part of the magnetic susceptibility, matching measurements from the imaginary part, electrical resistivity and magnetization. Ozaki et al. (2016) explained their Tc increase of 0.5 K in FeSe0.5Te0.5 films with the thickness (t) < the irradiating proton range (R), as due to a nanoscale compressive strain developed from radiation damage of the lattice. Here, Ar irradiation with t > R results in an Ar implanted layer in our crystal. Implanted inert gas atoms often agglomerate into high-pressure bubbles to exert a large compressive strain on the lattice. We suggest that this additional compressive strain could be the reason for such a large (~49%) Tc increase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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