Table 2 Comparison of properties of acoustic phonons for the tetragonal phase.

From: Polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CH3NH3PbI3

Velocity (m s−1)

Mean-free-path (Å)

Methods

Transverse

Longitudinal

Transverse

Longitudinal

 

970

3,270

−

−

DFT (ref. 36)*

1,445

2,250

19.99

38.19

DFT anharmonic (ref. 35)*

∼1,500

∼2,800

<100

MD (ref. 38)

∼1,200

−

Transport (ref. 37)

1,155

2,841

42

125

INS (this work)

  1. *Based on the cubic phase. The specific data of ref. 35 was requested from the authors.
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