Fig. 3: Inelastic neutron scattering of Ba2FeSi2O7.
From: Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet
a Contour map of the inelastic neutron-scattering (INS) data as a function of energy and momentum transfer along the [\(H\), 0, 0.5] direction measured at \(T\) = 1.6 K (\( < {T}_{{{{{{\rm{N}}}}}}}\)) using the HYSPEC time-of-flight spectrometer at SNS. d Contour map of the INS data as a function of energy and momentum transfer along [\(H\), \(H\), 0.5] direction measured at \(T\) = 1.4 K (\( < {T}_{{{{{{\rm{N}}}}}}}\)) using the cold Neutron Triple-Axis spectrometer (CTAX) at HFIR. The instrumental resolutions at energy = 2.5 meV for each instrument are indicated with blue bars along the \(y\)-axis in a and d. The two transverse modes and the longitudinal mode are labeled with \({T}_{1}\), \({T}_{2}\), and \(L\), respectively. b, c, e, f INS intensities calculated by the generalized linear spin-wave theory (GLSWT) and GLSWT plus one-loop corrections (GLSWT+one-loop) with the parameter sets \({{{{{\mathcal{A}}}}}}\) and \({{{{{\mathcal{B}}}}}}\) given in Table 1, respectively. The instrumental resolution of HYSPEC and CTAX was modeled in the calculated spectra using a Lorentzian function.
