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Spin-wave softening and Hund's coupling in ferromagnetic manganites | Sze-Shiang Feng
; Mogus Mochena
; | Date: |
14 Jun 2005 | Journal: | Journal of Physics: Condensed Matter 17(2005):3895-3901 | Subject: | Strongly Correlated Electrons | cond-mat.str-el | Abstract: | Using one-orbital model of hole-doped manganites, we show with the help of Holstein-Primakov transformation that finite Hund’s coupling is responsible for the spin-wave softening in the ferromagnetic $B$-phase manganites. We obtain an analytical result for the spin-wave spectrum for $JHgg t$. In the limit of infinte Hund’s coupling, the spectrum is the conventional nearest-neighbor Heisenberg ferromagnetic spin-wave. The $o(t/JH)$-order correction is negative and thus accounts for the softening near the zone boundary. | Source: | arXiv, cond-mat/0506321 | Services: | Forum | Review | PDF | Favorites |
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