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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", Leninskiiprosp. 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 RbEuFe4As4, 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 photoelectron 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 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
DOI: 10.3367/UFNe.2021.05.039018
Citation: Kim T, Pervakov K S, Vlasenko V A, Sadakov A V, Usol’tsev A S, Evtushinsky D, 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., accepted

12th, May 2021

:  ,   ,   ,   ,   ,  ,  , ϸ ,  ,  ,   ,   ,   ,  ,  ,  ,   ,   ,    « EuRbFe4As4» ,  ; DOI: 10.3367/UFNr.2021.05.039018

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