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|Type:||Artigo de periódico|
|Title:||Phase And Amplitude Fluctuations Of Incommensurate Spin Density Wave In Chromium|
|Abstract:||We investigate dynamical susceptibilities associated with fluctuations of an amplitude and a phase of the incommensurate spin density wave of chromium using a model Hamiltonian within the framework of the random phase approximation. They couple with charge density fluctuations with transfer momemtum q. The energy of the collective motion related to the amplitude fluctuation of the spin density wave (SDW) agrees with the energy gap of the single excitations in the limit q→0. The susceptibility related to the phase fluctuation has not a pole due to their coupling though the intensity of it has a peak and its peak height increases like q-2 with decreasing q.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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