Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.025506
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Funding
- CNRS Interdisciplinary Programs Fund (AAP INSIS)
- French National Research Agency [ANR-13-PRGE-0004]
- Austrian Science Fund [TRP 176-N22]
- Agence Nationale de la Recherche (ANR) [ANR-13-PRGE-0004] Funding Source: Agence Nationale de la Recherche (ANR)
- Austrian Science Fund (FWF) [TRP 176, I 623] Funding Source: researchfish
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Perfectly crystalline solids are excellent heat conductors. Prominent counterexamples are intermetallic clathrates, guest-host systems with a high potential for thermoelectric applications due to their ultralow thermal conductivities. Our combined experimental and theoretical investigation of the lattice dynamics of a particularly simple binary representative, Ba8Si46, identifies the mechanism responsible for the reduction of lattice thermal conductivity intrinsic to the perfect crystal structure. Above a critical wave vector, the purely harmonic guest-host interaction leads to a drastic transfer of spectral weight to the guest atoms, corresponding to a localization of the propagative phonons.
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