Fig. 4

Strengthening four-phonon scattering with temperature shifts the κ⁽³⁺⁴⁾-peak in BAs. a Pressure-temperature colormap of κ⁽³⁺⁴⁾ scaled by the corresponding zero-pressure value at each temperature \(\left( {\kappa _{0}^{(3 + 4)}} \right)\) along with the iso-κ⁽³⁺⁴⁾/\(\kappa _{0}^{(3 + 4)}\) lines, showing the non-monotonic pressure dependence of κ⁽³⁺⁴⁾ at each temperature beyond 300 K. Also shown is the shifting position of the thermal conductivity peak on the pressure-temperature surface. b Comparison of three-phonon and four-phonon scattering rates of the acoustic modes in BAs at 300 K and 750 K at different pressures. The center plots [(300 K, 17.5 GPa) and (750 K, 33 GPa)] are the conditions close to the κ⁽³⁺⁴⁾-peak in Fig. 2c at the corresponding temperatures