Evidence of Highly Anharmonic Soft Lattice Vibrations in a Zintl Rattler
Moinak Dutta, Manisha Samanta, Tanmoy Ghosh, David Voneshen, Kanishka Biswas
Abstract
Abstract Here, we present lattice dynamics associated with the local chemical bonding hierarchy in Zintl compound TlInTe 2 , which cause intriguing phonon excitations and strongly suppress the lattice thermal conductivity to an ultralow value (0.46–0.31 W m −1 K −1 ) in the 300–673 K. We established an intrinsic rattling nature in TlInTe 2 by studying the local structure and phonon vibrations using synchrotron X‐ray pair distribution function (PDF) (100–503 K) and inelastic neutron scattering (INS) (5–450 K), respectively. We showed that while 1D chain of covalently bonded transport heat with Debye type phonon excitation, ionically bonded Tl rattles with a frequency ca. 30 cm −1 inside distorted Thompson cage formed by . This highly anharmonic Tl rattling causes strong phonon scattering and consequently phonon lifetime reduces to ultralow value of ca. 0.66(6) ps, resulting in ultralow thermal conductivity in TlInTe 2 .