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28 March 2024
 
  » arxiv » cond-mat/0506321

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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
AbstractUsing 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
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