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|Type:||Artigo de periódico|
|Title:||The Long-range Coulomb Effects To The Phase Oscillations Of The Incommensurate Spin Density Wave|
|Abstract:||We have investigated the long-range Coulomb effects to coupled modes of the phase oscillation of the incommensurate spin density wave and the charge density fluctuations at zero temperature for situations A and B where band electrons completely lose the itinerant character with appearance of the single excitation gap in A and they still retain this character in B. For A there exists the only one coupled mode at zero momentum for finite frequencies region. This mode has a pole at the plasma frequency just as the Bogoliubov-Anderson mode has in the superconductor. For B there is a possibility of a linear spectrum existing with the velocity of order of the Fermi velocity under certain conditions in contrast with A lacking in this linear spectrum. The longitudinal susceptibility is expressed in terms of the amplitude and phase oscillations of the spin density wave.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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