上临界场和道光谱学低兴奋剂Na ((Fe,Co) 作为单晶
Leonid Morgun1, Svetoslav Kuzmichev1,2, Igor Morozov3
1Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia.
Materials (Basel, Switzerland)
|October 14, 2023
概括
这项研究研究了使用临界场测量和安德里耶夫反射光谱学低剂量NaFe0.979Co0.021As单晶的超导特性. 结果揭示了对超导顺序参数和差距异性质的见解.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 超导电性 超导电性 超导电性
背景情况:
- 低剂量的铁基超导体表现出复杂的超导特性.
- 对于这些材料来说,了解超导顺序参数及其异极性是至关重要的.
研究的目的:
- 综合研究低剂量NaFe0.979Co0.021As单晶体的超导性能.
- 为了确定超导顺序参数,并研究潜在的k空间异构性.
- 改进描述上临界场的模型.
主要方法:
- 在高达16 T的磁场下测量上临界场 (Hc2).
- 不相干的多重安德里耶夫反射效应 (IMARE) 光谱.
- 使用单带和双带模型进行分析.
主要成果:
- 对平面内和平面外的场方向测量了Hc2(T) 的温度依赖性.
- 通过IMARE对超导顺序参数 (ΔL,S(T)) 和它们的温度依赖的局部确定.
- 证明了超导间隙可能的k空间异构性.
- 在双带模型中使用IMARE衍生合常数,降低了Hc2(T) 装配的复杂性.
结论:
- IMARE光谱仪提供了直接的,局部探测超导特性.
- 这项研究提供了有关NaFe0.979Co0.021As.As.中的超导差距异性有价值的数据.
- 一个简化的两带模型方法是可行的IMARE衍生参数.
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