Novel magnetic stoichiometric superconductor compound EuRbFe$_4$As$_4$

Timur Kim; Ким Тимур; Kirill Sergeevich Pervakov; Перваков Кирилл Сергеевич; Vladimir Aleksandrovich Vlasenko; Власенко Владимир Александрович; Andrei Vladimirovich Sadakov; Садаков Андрей Владимирович; Alexey S. Usol'tsev; Усольцев Алексей Сергеевич; Daniil Evtushinsky; Евтушинский Даниил; Sungwon Jung; Юн Сангвон; Georg Poelchen; Пёльхен Георг; Kurt Kummer; Куммер Курт; Dmitrii Yur'evich Roditchev; Родичев Дмитрий Юрьевич; Vasiliy Sergeevich Stoliarov; Столяров Василий Сергеевич; Igor' Anatol'evich Golovchanskiy; Головчанский Игорь Анатольевич; Denis Vasil'evich Vyalikh; Вялых Денис Васильевич; Vladislav Borisov; Борисов Владислав; Roser Valenti; Валенти Розер; Arhur Ernst; Эрнст Артур; Sergey V. Eremeev; Еремеев Сергей Владимирович; Evgenii Vladimirovich Chulkov; Чулков Евгений Владимирович; Vladimir Moiseevich Pudalov; Пудалов Владимир Моисеевич

doi:10.3367/UFNr.2021.05.039018

Novel magnetic stoichiometric superconductor compound EuRbFe$_4$As$_4$

Authors: Kim T.¹, Pervakov K.S.², Vlasenko V.A.², Sadakov A.V.², Usol'tsev A.S.², Evtushinsky D.³, Jung S.¹, Poelchen G.⁴^,5, Kummer K.⁵, Roditchev D.Y.⁶^,7, Stoliarov V.S.⁷^,8^,9, Golovchanskiy I.A.⁷^,9^,8, Vyalikh D.V.¹⁰, Borisov V.¹¹, Valenti R.¹¹, Ernst A.¹²^,13, Eremeev S.V.¹⁴, Chulkov E.V.¹⁰^,15^,16, Pudalov V.M.²^,17
Affiliations:
1. Diamond Light Source Ltd
2. P. N. Lebedev Physical Institute of the Russian Academy of Sciences
3. École Polytechnique Fédérale de Lausanne
4. Institut für Festkörper- und Materialphysik, Technische Universität Dresden
5. European Synchrotron Radiation Facility
6. Paris Sorbonne University
7. Moscow Institute of Physics and Technology (National Research University)
8. National University of Science and Technology «MISIS»
9. All-Russia Research Institute of Automatics named after N L Dukhov
10. Donostia International Physics Center
11. Johann Wolfgang Goethe-Universität, Institut für Theoretische Physik
12. Johannes Kepler University Linz
13. Max Planck Institute of Microstructure Physics
14. Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences
15. Saint Petersburg State University
16. Departamento de Física de Materiales, Facultad de Quimica, UPV/EHU
17. National Research University Higher School of Economics
Issue: Vol 192, No 7 (2022)
Pages: 790-798
Section: Conferences and symposia
URL: https://journals.rcsi.science/0042-1294/article/view/256660
DOI: https://doi.org/10.3367/UFNr.2021.05.039018
ID: 256660

Cite item

Abstract

In the new stoichiometric high-temperature iron-based superconductor EuRbFe$_4$As$_4$, superconductivity coexists with a peculiar long-range magnetic order of the Eu 4f states; their coexistence is an enigma and a challenge for both experiment and theory. Using angle-resolved photoemission spectroscopy (ARPES), resonant photoemission spectroscopy (ResPES), Andreev reflection spectroscopy, scanning tunneling spectroscopy, and DFT band structure calculations, we have made significant progress in solving this puzzle. Our results unambiguously indicate a separation between the electronic states of Fe (superconductivity) and Eu (magnetism) and demonstrate the existence of superconducting and long-range magnetic orders almost independently of each other.

Keywords

iron-based superconductors, coexistence of superconductivity and magnetism

References

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Novel magnetic stoichiometric superconductor compound EuRbFe$_4$As$_4$

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