Fig. 4: One-dimensional cuts and energy dispersion of the magnetic excitations in detwinned FeSe.
From: Spin correlations in the nematic quantum disordered state of FeSe
a–j Constant-energy cuts along the [1, K], [H, 1], and [2 − K, K] directions across the Q = (1, 0) and (0, 1) (a–e) and Q = (1, 1) (f–j) for detwinned FeSe single crystals at base temperature. The integral intervals perpendicular to the cut directions are H = 1 ± 0.2, K = 1 ± 0.2, and Δq⊥ = 0.28 r.l.u., respectively. k Constant-Q cuts (Ei = 147.5 meV, T = 5 K) at Q = (1, q ± 0.05) (q = 0, 0.1, . . . , 0.6). The data are fitted by a general damped harmonic oscillator model (solid curves). l, m Magnetic excitation dispersions along [1, K] directions projected onto energy and momentum planes measured on (l) Sample #2 with Ei = 295 meV, T = 6 K, and (m) Sample #1 with Ei = 147.5 meV, T = 5 K. The black circle symbols represent the magnetic excitation dispersions at Q = (1, 0) and (1, 1), which are the Gaussian function fitting results of one-dimensional constant-energy cuts. The white squares and pink diamonds in (m) correspond to the damping factor γ(q)/2 and undamped energy E0, respectively, as determined by damped harmonic oscillator fitting in (k). The vertical bars indicate the statistical errors of 1 s.d.
