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Large thermopower from dressed quasiparticles in the layered cobaltates and rhodates

Su-Di Chen, Yu He, Alfred Zong, Yan Zhang, Makoto Hashimoto, Bin-Bin Zhang, Shu-Hua Yao, Yan-Bin Chen, Jian Zhou, Yan-Feng Chen, Sung-Kwan Mo, Zahid Hussain, Donghui Lu, and Zhi-Xun Shen
Phys. Rev. B 96, 081109(R) – Published 15 August 2017
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Abstract

The origin of the large thermopower in NaxCoO2 is complicated by correlation phenomena. To disentangle the effects from multiple interactions, we use angle-resolved photoemission to study KxRhO2, an isostructural analogy of NaxCoO2 with large thermopower and weak electron correlation. Using the experimentally measured electronic structure, we demonstrate that the thermopower in KxRhO2 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.

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  • Received 25 July 2016

DOI:https://doi.org/10.1103/PhysRevB.96.081109

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Su-Di Chen1,2, Yu He1,2, Alfred Zong3,*, Yan Zhang2,4,†, Makoto Hashimoto5, Bin-Bin Zhang6,7, Shu-Hua Yao6,7, Yan-Bin Chen6,8, Jian Zhou6,7, Yan-Feng Chen6,9, Sung-Kwan Mo4, Zahid Hussain4, Donghui Lu5, and Zhi-Xun Shen1,2,3,‡

  • 1Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 2SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 3Department of Physics, Stanford University, Stanford, California 94305, USA
  • 4Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 6National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China
  • 7Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
  • 8Department of Physics, Nanjing University, Nanjing 210093, China
  • 9Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

  • *Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • Present address: International Center for Quantum Materials, School of Physics, Peking University, and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
  • zxshen@stanford.edu

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Issue

Vol. 96, Iss. 8 — 15 August 2017

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