Science Advances

This PDF file includes:

• Section S1. Supplementary information on experimental methods
• Section S2. Energy scheme of Fe²⁺ ion in CsFeCl₃
• Section S3. ESW theory for triangular antiferromagnet
• Section S4. Detailed data analysis for triple-axis spectrometer
• Fig. S1. Method of background subtraction for INS spectra.
• Fig. S2. Energy scheme of Fe²⁺ ion in CsFeCl₃.
• Fig. S3. Schematic of hopping and pair creation processes.
• Fig. S4. Calculated INS spectra at various pressures.
• Fig. S5. Data analysis for triple-axis spectrometer.
• Table S1. Summary of experimental setups used for INS measurements under pressures.
• Table S2. Summary of parameters obtained from the refinement on the constant q scans q = (−k, 2k, 0) at 1.4 GPa by Lorentzians convoluted by the experimental resolution functions.
• References (31–37)

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