期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 11, 期 21, 页码 9393-9399出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c02711
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资金
- Russian Science Foundation [18-72-10118]
- French ANR Grant SUPERSTRIPES
- COST Action [CA16218]
- Government research assignment for ISPMS SB RAS [III.23.2.9]
- Spanish Ministry of Economy [MAT2017-88374-P]
- Ministry of Science and Higher Education of the Russian Federation [0023-2019-0005]
- RFBR [18-02-01013]
- Russian Science Foundation [18-72-10118] Funding Source: Russian Science Foundation
In pnictide RbEuFe4As4, superconductivity sets in at 36 K and coexists, below 15-19 K, with the long-range magnetic ordering of Eu 4f spins. Here we report scanning tunneling experiments performed on cold-cleaved single crystals of the compound. The data revealed the coexistence of large Rb-terminated and small Eu-terminated terraces, both manifesting 1 x 2 and root 2 x root 2 reconstructions. On root 2 x root 2 surfaces, a hidden electronic order with a period similar to 5 nm was discovered. A superconducting gap of similar to 7 meV was seen to be strongly filled with quasiparticle states. The tunneling spectra compared with density functional theory calculations confirmed that flat electronic bands due to Eu 4f orbitals are situated similar to 1.8 eV below the Fermi level and thus do not contribute directly to Cooper pair formation.
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