期刊
NPJ QUANTUM MATERIALS
卷 7, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41535-021-00419-1
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资金
- Italian Ministry of Education, University and Research [201785KWLE, 2017Z8TS5B]
- National Key R&D Program of China [2018YFA0704300]
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB25000000]
- MEPhI
This study investigates the gap structure and anisotropy of RbCa2(Fe1-xNix)(4)As4F2 single crystals by combining directional point-contact Andreev-reflection spectroscopy and coplanar waveguide resonator measurements. The results show that the compound has two gaps with d-wave-like nodal structures, which persist upon Ni doping, and that its anisotropy is in good agreement with the d-d model.
The 12442 compounds are a recently discovered family of iron-based superconductors, that share several features with the cuprates due to their strongly anisotropic structure, but are so far poorly understood. Here, we report on the gap structure and anisotropy of RbCa2(Fe1-xNix)(4)As4F2 single crystals, investigated by a combination of directional point-contact Andreev-reflection spectroscopy and coplanar waveguide resonator measurements. Two gaps were identified, with clear signatures of d-wave-like nodal structures which persist upon Ni doping, well described by a two-band d - d state with symmetry-imposed nodes. A large London penetration depth anisotropy was revealed, weakly dependent on temperature and fully compatible with the d - d model.
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