Interacting Dipoles in Type-I Clathrates: Why Glass-like though Crystal?

Abstract

Almost identical thermal properties of type-I clathrate compounds to those of glasses follow naturally from the consideration that off-centered guest ions possess electric dipole moments. Local fields from neighbor dipoles create many potential minima in the configuration space. A theoretical analysis based on two-level tunneling states demonstrates that interacting dipoles are a key to quantitatively explain the glass-like behaviors of low-temperature thermal properties of type-I clathrate compounds with off-centered guest ions.From this analysis, we predict the existence of a glass transition.

References in corpus (4)

• Glass-Like Heat Conduction in High-Mobility Crystalline Semiconductors
• Glasslike vs. crystalline thermal conductivity in carrier-tuned Ba8Ga16X30 clathrates (X = Ge, Sn)
• Cage-size control of guest vibration and thermal conductivity in Sr8Ga16Si30-xGex
• Interacting quantum rotors in oxygen-doped germanium

Cited by in corpus (7)

• Phonon-glass electron-crystal thermoelectric clathrates: Experiments and theory
• Theory of the phonon spectrum in host-guest crystalline solids with avoided crossing
• Significance of Off-Center Rattling for Emerging Low-lying THz Modes in type-I Clathrates
• Retrieval of the atomic displacements in the crystal from the coherent x-ray diffraction pattern
• Optical conductivity from local anharmonic phonons
• Anharmonic phonon renormalization and thermal transport in the type-I Ba${}_8$Ga${}_{16}$Sn${}_{30}$ clathrate from first principles
• Glass-like Thermal-Transport in Symmetry-Broken Clathrates