Year: 2017
Type: article
Abstract: The origin of the large thermopower in ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}$ is complicated by correlation phenomena. To disentangle the effects from multiple interactions, we use angle-resolved photoemission to study ${\mathrm{K}}_{x}{\mathrm{RhO}}_{2}$, an isostructural analogy of ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}$ with large thermopower and weak electron correlation. Using the experimentally measured electronic structure, we demonstrate that the thermopower in ${\mathrm{K}}_{x}{\mathrm{RhO}}_{2}$ can be quantitatively explained within the quasiparticle framework after including an electron-phonon mass enhancement effect. Extending the analysis to the cobaltate, we find the doubling in thermopower is well accounted for by additional band renormalization from electron correlation. As such, the large thermopower emerges from the itinerant quasiparticles dressed by hierarchical electron-phonon and electron-electron interactions.
Institutions: SLAC National Accelerator Laboratory, Stanford University, Lawrence Berkeley National Laboratory, Advanced Light Source, Stanford Synchrotron Radiation Lightsource, National Laboratory of Solid State Microstructures, Nanjing University, Collaborative Innovation Center of Advanced Microstructures
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G1229526393, G1286236842, G1286251239, G1561258537, G2371548206, G2618837358, G303061748, G30714459, G3083819904, G419881185, G42916606, G4501827968, 具有强自旋-轨道耦合的晶体和薄膜材料的制备及其量子效应的研究, G495301720, G498139845, BiCuSeO系统单晶的本征电输运、热输运的物理机理研究, G5570207115, G650090426, G6550344761, G6614858836, G6652958823, G704498496, G7283024673, G8382000481, G911061179, G969889393
OpenAlex ID: W2749272311