Distinct Signatures of Electron–Phonon Coupling Observed in the Lattice Thermal Conductivity of NbSe₃ Nanowires

Abstract

The last two decades have seen tremendous progress in quantitative understanding of several major phonon scattering mechanisms (phonon-phonon, phonon-boundary, phonon-defects), as they are the determinant factors in lattice thermal transport, which is critical for the proper functioning of various electronic and energy conversion devices. However, the roles of another major scattering mechanism, electron-phonon (e-ph) interactions, remain elusive. This is largely due to the lack of solid experimental evidence for the effects of e-ph scattering in the lattice thermal conductivity for the material systems studied thus far. Here we show distinct signatures in the lattice thermal conductivity observed below the charge density wave transition temperatures in NbSe3 nanowires, which cannot be recaptured without considering e-ph scattering. Our findings can serve as the cornerstone for quantitative understanding of the e-ph scattering effects on lattice thermal transport in many technologically important materials.

Decoupling electron and phonon transport in single-nanowire hybrid materials for high-performance thermoelectrics

“…The thermoelectric properties of individual Te-PEDOT:PSS nanowires were measured using a custom-fabricated suspended microheater device shown in Fig. 1B (23)(24)(25), which enables simultaneous measurement of , S, and  on the same nanowire sample (see Materials and Methods) (26,27). This sample geometry ensures that both thermal and electrical properties are measured along the same axial direction, which is crucial given the anisotropic nature of these hybrids, and addresses a major drawback with previous thin film measurements.…”

Structure of the superconducting high-pressure phase of Sc3CoC4

“…Superconducting compounds with intrinsically low-dimensional character have a special appeal to solid-state sciences, although the synthesis of large and defect-free single crystals is often challenging. This, for example, becomes evident from the large number of publications devoted to the well-known quasi-one-dimensional NbSe 3 [13,14,21,22] or quasi-twodimensional graphite or graphene [23,24] and transition-metal dichalcogenides [10,[25][26][27][28][29].…”

Anomalously Suppressed Thermal Conduction by Electron‐Phonon Coupling in Charge‐Density‐Wave Tantalum Disulfide

“…reported κ L reduced in NbSe 3 nanowires beyond conventional phonon scattering mechanisms that is attributed to e‐ph coupling. [ 7 ] Theoretical calculations done by Li et al. show that group‐V transition metal carbides (VC, NbC, and TaC) host intrinsically strong e‐ph coupling and weak ph‐ph scattering, leading to κ L theoretically much lower than the case when the e‐ph coupling is absent.…”