Shantanu Semwal

Emergent coherent-incoherent phonon crossover enables ultralow lattice thermal conductivity in 3D double perovskite

The interplay between coherent (wave-like) and incoherent (particle-like) phonon transport is central to heat conduction, yet experimental evidence of their crossover in bulk three-dimensional (3D) crystals remains scarce. Here, we report intrinsically ultralow lattice thermal co...