T. K. Kim, K. S. Pervakov, V. A. Vlasenko, A. V. Sadakov, A. S. Usol'tsev, D. V. Evtushinsky, S. Jung, G. Poelchen, K. Kummer, D. Roditchev, V. S Stolyarov, I. A. Golovchanskiy, D. V. Vyalikh, V. Borisov, R. Valenti, A. Ernst, S. V. Eremeev, E. V. Chulkov, V. M. Pudalov, “Novel magnetic stoichiometric superconductor compound EuRbFe<nobr>$_4$</nobr>As<nobr>$_4$</nobr>”, UFN, 2022, Volume 192, Number 7,Pages <nobr>790–798</nobr>

RUS ENG

JOURNALS // Uspekhi Fizicheskikh Nauk // Archive

UFN, 2022 Volume 192, Number 7, Pages 790–798 (Mi ufn7322)

This article is cited in 6 papers

CONFERENCES AND SYMPOSIA

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

T. K. Kim^a, K. S. Pervakov^b, V. A. Vlasenko^b, A. V. Sadakov^b, A. S. Usol'tsev^b, D. V. Evtushinsky^c, S. Jung^a, G. Poelchen^de, K. Kummer^e, D. Roditchev^fgh, V. S Stolyarov^hij, I. A. Golovchanskiy^hji, D. V. Vyalikh^kl, V. Borisov^m, R. Valenti^m, A. Ernst^no, S. V. Eremeev^p, E. V. Chulkov^kqr, V. M. Pudalov^bs

^a Diamond Light Source Ltd, Didcot
^b Lebedev Physical Institute of the Russian Academy of Sciences, Moscow
^c Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne
^d Institut für Festkörperphysik und Materialphysik, Technische Universität Dresden
^e European Synchrotron Radiation Facility, Grenoble
^f LPEM, ESPCI Paris, PSL Research University, CNRS, 75005 Paris, France
^g Sorbonne University, Paris
^h Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region
ⁱ National University of Science and Technology MISIS, Moscow
^j Dukhov Research Institute of Automatics, Moscow
^k Donostia International Physics Center
^l IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
^m Institut für Theoretische Physik, Goethe-Universität Frankfurt
ⁿ Institut für Theoretische Physik, Johannes Kepler Universität , Linz
^o Max-Planck-Institut für Mikrostrukturphysik, Halle
^p Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences
^q St. Petersburg State University
^r Departamento de Fizica de Materiales UPV/EHU and Centro de Fizica de Materiales (CFM-MPC), Cento Mixto CSIC-UPV/EHU, San Sebastian, Basque Country
^s National Research University Higher School of Economics, Moscow

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.

PACS: 74.25.-q, 74.25.Ha, 74.70.-b

Received: May 12, 2021
Accepted: May 12, 2021

DOI: 10.3367/UFNr.2021.05.039018

English version: Physics–Uspekhi, 2022, 65:7, 740–747

Bibliographic databases:

© Steklov Math. Inst. of RAS, 2024