Unusual relationship between magnetism and superconductivity in FeTe(0.5)Se(0.5)

We use neutron scattering to study magnetic excitations in crystals near the ideal superconducting composition of FeTe(0.5)Se(0.5). Two types of excitations are found, a resonance at (0.5,0.5,0) and incommensurate fluctuations on either side of this position. We show that the two sets of magnetic ex...

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Published inPhysical review letters Vol. 104; no. 18; p. 187002
Main Authors Mook, H A, Lumsden, M D, Christianson, A D, Nagler, S E, Sales, Brian C, Jin, Rongying, McGuire, Michael A, Sefat, Athena S, Mandrus, D, Egami, T, dela Cruz, Clarina
Format Journal Article
LanguageEnglish
Published United States 07.05.2010
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Summary:We use neutron scattering to study magnetic excitations in crystals near the ideal superconducting composition of FeTe(0.5)Se(0.5). Two types of excitations are found, a resonance at (0.5,0.5,0) and incommensurate fluctuations on either side of this position. We show that the two sets of magnetic excitations behave differently with doping, with the resonance being fixed in position while the incommensurate excitations move as the doping is changed. These unusual results show that a common behavior of the low energy magnetic excitations is not necessary for pairing in these materials.
ISSN:1079-7114