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Extended anharmonic collapse of phonon dispersions in SnS and SnSe.

Abstract：

:The lattice dynamics and high-temperature structural transition in SnS and SnSe are investigated via inelastic neutron scattering, high-resolution Raman spectroscopy and anharmonic first-principles simulations. We uncover a spectacular, extreme softening and reconstruction of an entire manifold of low-energy acoustic and optic branches across a structural transition, reflecting strong directionality in bonding strength and anharmonicity. Further, our results solve a prior controversy by revealing the soft-mode mechanism of the phase transition that impacts thermal transport and thermoelectric efficiency. Our simulations of anharmonic phonon renormalization go beyond low-order perturbation theory and capture these striking effects, showing that the large phonon shifts directly affect the thermal conductivity by altering both the phonon scattering phase space and the group velocities. These results provide a detailed microscopic understanding of phase stability and thermal transport in technologically important materials, providing further insights on ways to control phonon propagation in thermoelectrics, photovoltaics, and other materials requiring thermal management.

journal_name

Nat Commun

journal_title

Nature communications

authors

Lanigan-Atkins T,Yang S,Niedziela JL,Bansal D,May AF,Puretzky AA,Lin JYY,Pajerowski DM,Hong T,Chi S,Ehlers G,Delaire O

doi

10.1038/s41467-020-18121-4

subject

Has Abstract

pub_date

2020-09-04 00:00:00

pages

4430

issue

1

issn

2041-1723

pii

10.1038/s41467-020-18121-4

journal_volume

11

pub_type

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