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Top panel: Magnon lineshapes for q = (π, 0) (a) and q = (π, π) (b) at the same temperatures. The low T spectrum is concordant with a nearest neighbour Heisenberg model for J ef f ∼ 0.1t. Near TF M , asymmetric and broad lineshapes are seen. Bottom: Theoretical estimates of 'mode softening' and broadening for magnons (similar to phonons) for (π, 0) (c) and (π, π) (d). We see enhanced softening in the latter.

Top panel: Magnon lineshapes for q = (π, 0) (a) and q = (π, π) (b) at the same temperatures. The low T spectrum is concordant with a nearest neighbour Heisenberg model for J ef f ∼ 0.1t. Near TF M , asymmetric and broad lineshapes are seen. Bottom: Theoretical estimates of 'mode softening' and broadening for magnons (similar to phonons) for (π, 0) (c) and (π, π) (d). We see enhanced softening in the latter.

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We solve for the finite temperature collective mode dynamics in the Holstein-double exchange problem, using coupled Langevin equations for the phonon and spin variables. We present results in a strongly anharmonic regime, close to a polaronic instability. For our parameter choice the system transits from an `undistorted' ferromagnetic metal at low...

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Context 1
... Fig.3 we first compare lineshapes in four temperature regimes between the Holstein-double exchange (H-DE) and the Holstein (H) model at comparable density. ...
Context 2
... Fig.3 we first compare lineshapes in four temperature regimes between the Holstein-double exchange (H-DE) and the Holstein (H) model at comparable density. ...

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