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Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Dec2014, Vol. 90 Issue 22, p220506-1-220506-5. 5p. - Publication Year :
- 2014
-
Abstract
- The cuprate high temperature superconductors exhibit a pronounced trend in which the superconducting transition temperature Tc increases with the number of CuC2planes n in the crystal structure. We compare the magnetic excitation spectrum of Bi2+xSr2-xCuO6+δ (Bi-2201) and Bi2Sr2Ca2CuO10+δ (Bi-2223), with n = 1 and 3, respectively, using Cu L3-edge resonant inelastic x-ray scattering. Near the antinodal zone boundary we find the paramagnon energy in Bi-2223 is substantially higher than that in Bi-2201, indicating that multilayer cuprates host stronger effective magnetic exchange interactions, providing a possible explanation for the Tc vs n scaling. In contrast, the nodal direction exhibits very strongly damped, almost nondispersive excitations. We argue that this implies that the magnetism in the doped cuprates is partially itinerant in nature. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CUPRATES
*HIGH temperatures
*CRYSTAL structure
*SUPERCONDUCTORS
*X-ray scattering
Subjects
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 90
- Issue :
- 22
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 101006471
- Full Text :
- https://doi.org/10.1103/PhysRevB.90.220506