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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/50812
Record Status
Checked
Record Id
50812
Title
Testing the itinerancy of spin dynamics in superconducting Bi2Sr2CaCu2O8+
Contributors
G Xu
,
GD Gu
,
M Hücker
,
B Fauqué
,
TG Perring (STFC Rutherford Appleton Lab.)
,
LP Regnault
,
JM Tranquada
Abstract
Much of what we know about the electronic states of high-temperature superconductors is due to photoemission and scanning tunnelling spectroscopy studies of the compound Bi2Sr2CaCu2O8+. The demonstration of well-defined quasiparticles in the superconducting state has encouraged many theorists to apply the conventional theory of metals, Fermi-liquid theory, to the cuprates. In particular, the spin excitations observed by neutron scattering at energies below twice the superconducting gap energy are commonly believed to correspond to an excitonic state involving itinerant electrons. Here, we present the first measurements of the magnetic spectral weight of optimally doped Bi2Sr2CaCu2O8+ in absolute units. The lack of temperature dependence of the local spin susceptibility across the superconducting transition temperature, Tc, is incompatible with the itinerant calculations. Alternatively, the magnetic excitations could be due to local moments, as the magnetic spectrum is similar to that in La1.875Ba0.125CuO4, where quasiparticles16 and local moments coexist.
Organisation
ISIS
,
ISIS-MAPS
,
STFC
Keywords
Physics
Funding Information
Related Research Object(s):
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Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Nature
5 (2009): 642-646.
doi:10.1038/nphys1360
2009
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