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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/51919
Record Status
Checked
Record Id
51919
Title
Evolution of spin excitations into the superconducting state in FeTe1-xSex
Contributors
MD Lumsden
,
AD Christianson
,
EA Goremychkin (STFC Rutherford Appleton Lab.)
,
SE Nagler
,
HA Mook
,
MB Stone
,
DL Abernathy
,
T Guidi (STFC Rutherford Appleton Lab.)
,
GJ MacDougall
,
C De la Cruz
,
AS Sefat
,
MA McGuire
,
BC Sales
,
D Mandrus
Abstract
The origin of the superconducting state in the recently discovered Fe-based materials is the subject of intense scrutiny. Neutron scattering and NMR measurements have already demonstrated a strong correlation between magnetism and superconductivity. A central unanswered question concerns the nature of the normal-state spin fluctuations that may be responsible for the pairing. Here we present inelastic neutron scattering measurements from large single crystals of superconducting and non-superconducting Fe1+yTe1-xSex. These measurements indicate a spin fluctuation spectrum dominated by two-dimensional incommensurate excitations extending to energies greater than 250;meV. Most importantly, the spin excitations in Fe1+yTe1-xSex have four-fold symmetry about the (1, 0) wavevector (square-lattice (pi,pi) point). Moreover, the excitations are described by the identical wavevector and can be characterized by the same model as the normal-state spin excitations in the high-TC cuprates. These results demonstrate commonality between the magnetism in these classes of materials, which perhaps extends to a common origin for superconductivity.
Organisation
ISIS
,
ISIS-MERLIN
,
STFC
Keywords
Physics
,
superconductivity
,
magnetism
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Nat Phys
6 (2010): 182-186.
doi:10.1038/nphys1512
2010
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