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Issue 11, 2024
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Novel magnetic stoichiometric superconductor compound EuRbFe4As4

 a,  b,  b,  b,  c, b,  d,  a,  e, f,  f,  c, g, h,  c, i, j,  c, i, j,  k, l,  m,  m,  n, o,  p,  q, r, k, †  b
a Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
b Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
c Moscow Institute of Physics and Technology (National Research University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141701, Russian Federation
d École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
e Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Haeckelstraße 3, Dresden, 01069, Germany
f European Synchrotron Radiation Facility, Rue Jules Horowitz 6, Grenoble, 38043, France
g LPEM, ESPCI Paris, PSL Research University, CNRS, Paris, France
h Sorbonne Université, Paris, France
i National University of Science and Technology "MISIS", Leninskii prosp. 4, Moscow, 119049, Russian Federation
j Dukhov Research Institute of Automatics, ul. Sushchevskaya 22, Moscow, 119017, Russian Federation
k Donostia International Physics Center, Paseo Manuel de Lardizabal 4, Donostia-San Sebastián, 20018, Spain
l IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
m Johann Wolfgang Goethe-Universität, Institut für Theoretische Physik, Max-von-Laue-Straße 1, Frankfurt am Main, DE-60438, Germany
n Institut für Theoretische Physik, Johannes Kepler Universität, Altenbergerstr. 69, Linz, A-4040, Austria
o Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, Halle (Saale), 06120, Germany
p Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, pr. Akademicheskii 2/1, Tomsk, 634055, Russian Federation
q St. Petersburg State University, Universitetskaya naberezhnaya, 7 - 9, St. Petersburg, 199034, Russian Federation
r Departamento de Fizica de Materiales, Facultad de Ciencias Quimicas, UPV/EHU, Apdo 1072, San Sebastian, Basque Country, 20080, Spain

In the new stoichiometric high-temperature iron-based superconductor EuRbFe4As4, 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.

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Fulltext is also available at DOI: 10.3367/UFNe.2021.05.039018
Keywords: iron-based superconductors, coexistence of superconductivity and magnetism
PACS: 74.25.−q, 74.25.Ha, 74.70.−b (all)
DOI: 10.3367/UFNe.2021.05.039018
URL: https://ufn.ru/en/articles/2022/7/g/
001100230300006
2-s2.0-85134876598
2022PhyU...65..740K
Citation: Kim T K, Pervakov K S, Vlasenko V A, Sadakov A V, Usol’tsev A S, Evtushinsky D V, Jung S, Poelchen G, Kummer K, Roditchev D, Stoliarov V S, Golovchanskiy I A, Vyalikh D V, Borisov V, Valenti R, Ernst A, Eremeev S V, Chulkov E V, Pudalov V M "Novel magnetic stoichiometric superconductor compound EuRbFe4As4" Phys. Usp. 65 740–747 (2022)
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Received: 12th, May 2021, 12th, May 2021

Оригинал: Ким Т K, Перваков К С, Власенко В А, Садаков А В, Усольцев А С, Евтушинский Д В, Юн С, Пёльхен Г, Куммер К, Родичев Д, Столяров В С, Головчанский И А, Вялых Д В, Борисов В, Валенти Р, Эрнст А, Еремеев С В, Чулков Е В, Пудалов В М «Новый магнитный сверхпроводник стехиометрического состава EuRbFe4As4» УФН 192 790–798 (2022); DOI: 10.3367/UFNr.2021.05.039018

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