Marta Fernández-Lomana, Paula Obladen Aguilera, Beilun Wu, Edwin Herrera, Hermann Suderow, Isabel Guillamón
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引用次数: 0
摘要
我们提供了使用毫开尔文扫描隧道显微镜测量的锑化物超导体 LaRu2P2(Tc= 4.1 K)的超导态密度。从隧穿电导中,我们提取出了一个状态密度,它显示了一个 s 波单超导间隙的打开。间隙的温度依赖性也遵循 BCS 理论。在磁场作用下,涡旋呈现出卡洛里-德-吉尼斯-马特里康态,尽管这些态因缺陷散射而被强烈拓宽。根据涡旋核心的尺寸,我们得出超导相干长度为 ξ= 50 nm,这与宏观 Hc2 测量值相符。我们讨论了 s 波 LaRu2P2 和 pnictide 非常规多间隙与强相关铁基超导体之间的比较。
Superconducting density of states and vortex lattice of LaRu2P2observed by Scanning Tunneling Spectroscopy.
We provide the superconducting density of states of the pnictide superconductor LaRu2P2(Tc= 4.1 K), measured using millikelvin Scanning Tunneling Microscopy. From the tunneling conductance, we extract a density of states which shows the opening of a s-wave single superconducting gap. The temperature dependence of the gap also follows BCS theory. Under magnetic fields, vortices present Caroli de Gennes Matricon states, although these are strongly broadened by defect scattering. From the vortex core size we obtain a superconducting coherence length of ξ= 50 nm, compatible with the value extracted from macroscopic Hc2measurements. We discuss the comparison between s-wave LaRu2P2and pnictide unconventional multiple gap and strongly correlated Fe based superconductors.
期刊介绍:
Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.