Fig. 4: Thermal conductivity of Na2CoSe2O. | npj Quantum Materials

Fig. 4: Thermal conductivity of Na2CoSe2O.

From: Phonon bunching induced strong four-phonon scattering for low lattice thermal conductivity in layered Na2CoSe2O

Fig. 4: Thermal conductivity of Na2CoSe2O.

a–c are the temperature-dependent average, in-plane, and out-of-plane thermal conductivities within particlelike three- (3 ph) and four- (4 ph) phonon processes (κp-3ph and κp-3+4ph) and wavelike tunnelling effect (κc). d Mode contribution to κp at 300 K. e, f are spectral and cumulative κp and κc, respectively. Dashed lines indicate the cut-off frequency of bunched phonons.

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