TY - JOUR
T1 - Electronic Structures and Surface Reconstructions in Magnetic Superconductor RbEuFe4As4
AU - Stolyarov, Vasily S.
AU - Pervakov, Kirill S.
AU - Astrakhantseva, Anna S.
AU - Golovchanskiy, Igor A.
AU - Vyalikh, Denis V.
AU - Kim, Timur K.
AU - Eremeev, Sergey V.
AU - Vlasenko, Vladimir A.
AU - Pudalov, Vladimir M.
AU - Golubov, Alexander A.
AU - Chulkov, Eugene V.
AU - Roditchev, Dimitri
PY - 2020/11/5
Y1 - 2020/11/5
N2 - 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 × 2 and 2×2 reconstructions. On 2×2 surfaces, a hidden electronic order with a period â 5 nm was discovered. A superconducting gap of â 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 â 1.8 eV below the Fermi level and thus do not contribute directly to Cooper pair formation.
AB - 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 × 2 and 2×2 reconstructions. On 2×2 surfaces, a hidden electronic order with a period â 5 nm was discovered. A superconducting gap of â 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 â 1.8 eV below the Fermi level and thus do not contribute directly to Cooper pair formation.
KW - 22/2 OA procedure
UR - http://www.scopus.com/inward/record.url?scp=85095799869&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.0c02711
DO - 10.1021/acs.jpclett.0c02711
M3 - Article
C2 - 33095988
AN - SCOPUS:85095799869
SN - 1948-7185
VL - 11
SP - 9393
EP - 9399
JO - The journal of physical chemistry letters
JF - The journal of physical chemistry letters
IS - 21
ER -