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Synthesis, crystal structure, and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals

TitleSynthesis, crystal structure, and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals
Publication TypeJournal Article
Year of Publication2011
AuthorsHu RW, Lei HC, Abeykoon M, Bozin ES, Billinge SJL, Warren JB, Siegrist T, Petrovic C
Journal TitlePhysical Review B
Volume83
Pages224502
Date Published06/20
ISBN Number1098-0121
Accession NumberISI:000291797600008
Keywordsalpha-fese, fe7se8, pressure, superconductivity
Abstract

Understanding iron-based superconductors requires high-quality impurity-free single crystals. So far they have been elusive for beta-FeSe and extraction of intrinsic materials properties has been compromised by several magnetic-impurity phases. Here, we report synchrotron-clean beta-FeSe superconducting single crystals grown via LiCl/CsCl flux method. Phase purity yields evidence for a defect-induced weak ferromagnetism that coexists with superconductivity below T-c. In contrast to Fe1+y Te-based superconductors, our results reveal that the interstitial Fe(2) site is not occupied and that all contribution to density of states at the Fermi level must come from in-plane Fe(1).
URL<Go to ISI>://000291797600008
DOI10.1103/PhysRevB.83.224502
Alternate JournalPhys Rev BPhys Rev B