Photoemission and muon spin relaxation spectroscopy of the iron-based Rb0.77Fe1.61Se2 superconductor: Crucial role of the cigar-shaped Fermi surface

J. Maletz , B. Zabolotnyy , V. Evtushinsky , N. Yaresko , A. Kordyuk , Z. Shermadini , H. Luetkens , K. Sedlak , R. Khasanov , A. Amato , Anna Krztoń-Maziopa , K. Conder , E. Pomjakushina , H. Klauss , L. Rienks , B. Büchner , S. V. Borisenko

Abstract

In this study, we investigate the electronic and magnetic properties of Rb0.77Fe1.61Se2 (Tc = 32.6 K) in normal and superconducting states by means of photoemission and μSR spectroscopies as well as band-structure calculations.We demonstrate that the unusual behavior of these materials is the result of separation into metallic (∼12%) and insulating (∼88%) phases. Only the former becomes superconducting and has a usual electronic structure of electron-doped FeSe slabs. Our results thus imply that the antiferromagnetic insulating phase is just a by-product of Rb intercalation and its magnetic properties have no direct relation to the superconductivity. Instead, we find that also in this class of iron-based compounds, the key ingredient for superconductivity is a certain proximity of a Van Hove singularity to the Fermi level.
Author J. Maletz - [Leibniz-Institut fur Festkorper- und Werkstoffforschung Dresden]
J. Maletz,,
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, B. Zabolotnyy
B. Zabolotnyy,,
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, V. Evtushinsky
V. Evtushinsky,,
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, N. Yaresko
N. Yaresko,,
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, A. Kordyuk - [Leibniz-Institut fur Festkorper- und Werkstoffforschung Dresden]
A. Kordyuk,,
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, Z. Shermadini - [Paul Scherrer Institut]
Z. Shermadini,,
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, H. Luetkens - [Paul Scherrer Institut]
H. Luetkens,,
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, K. Sedlak - [Paul Scherrer Institut]
K. Sedlak,,
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, R. Khasanov - [Paul Scherrer Institut]
R. Khasanov,,
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, A. Amato - [Paul Scherrer Institut]
A. Amato,,
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et al.`
Journal seriesPhysical Review B, ISSN 1098-0121
Issue year2013
Vol88
Pages134501-134507
Publication size in sheets0.5
Keywords in Englishintercalated, iron chalcogenide superconductor, Fermi surface, ARPES, superconductivity
ASJC Classification3104 Condensed Matter Physics; 2504 Electronic, Optical and Magnetic Materials
DOIDOI:10.1103/PhysRevB.88.134501
URL http://journals.aps.org/prb/abstract/10.1103/PhysRevB.88.134501
Internal identifier5034
Languageen angielski
File
PhysRevB.88.134501.pdf 2.49 MB
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 35.0, 23-01-2020, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 23-01-2020, ArticleFromJournal
Publication indicators Scopus Citations = 20; WoS Citations = 15; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 1.326; WoS Impact Factor: 2013 = 3.664 (2) - 2013=3.564 (5)
Citation count*9 (2015-11-27)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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