]>Real-Time Observation of Cuprates Structural Dynamics by Ultrafast Electron Crystallography : Figure 9
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Figure 9: Experimental and theoretical intensity transients. (a) Lattice temperature derived from diffraction using (1) and (3), for different polarizations, along [ 0 1 0 ] (blue dots) and [ 1 1 0 ] (red dots), in optimally doped Bi2212. From the three-temperature model described in the text, we obtain that 𝜆 = 0 . 0 8 for ⃗ 𝐸 //[ 1 1 0 ] ( 𝑇 𝑙 , red solid line) and 𝜆 = 0 . 5 5 for ⃗ 𝐸 //[ 0 1 0 ] ( 𝑇 𝑙 , blue solid line). The electronic ( 𝑇 𝑒 , dashed lines) and hot-phonon ( 𝑇 𝑝 , solid lines) temperatures are also displayed. (b) Derivatives of the (00) diffraction intensity derived from Figure 2(a) for different polarizations. (c) Derivatives of the simulated lattice temperature within the three-temperature model, for different λ with a fixed anharmonic coupling time τ a = 2.8 ps (also shown in (b)) and for different τ a with a fixed λ = 0.26 (inset). The clear shift of the minimum position is only observed when λ is varied (black dotted lines). (d) Three-temperature model analysis for underdoped Bi2212. (e) Three-temperature model analysis for Bi2223.