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This content will become publicly available on August 15, 2018

Title: Large thermopower from dressed quasiparticles in the layered cobaltates and rhodates

The origin of the large thermopower in Na x CoO 2 is complicated by correlation phenomena. To disentangle the effects from multiple interactions, we use angle-resolved photoemission to study K x RhO 2, an isostructural analogy of Na xCoO 2 with large thermopower and weak electron correlation. In using the experimentally measured electronic structure, we demonstrate that the thermopower in K xRhO 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. Thus, the large thermopower emerges from the itinerant quasiparticles dressed by hierarchical electron-phonon and electron-electron interactions.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [5] ;  [7] ;  [8] ;  [8] ;  [4] ;  [9]
  1. Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Sciences (SIMES)
  2. Stanford Univ., CA (United States). Dept. of Physics
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Sciences (SIMES); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
  5. Nanjing Univ. (China). National Lab. of Solid State Microstructure, Dept. of Materials Science and Engineering
  6. Nanjing Univ. (China). National Lab. of Solid State Microstructure, Dept. of Physics
  7. Nanjing Univ. (China). National Lab. of Solid State Microstructure, Collaborative Innovation Center of Advanced Microstructures
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  9. Stanford Univ., CA (United States). Dept. of Applied Physics, Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Sciences (SIMES)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; 11374149; 11574131; 91622122
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 8; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1390319
Alternate Identifier(s):
OSTI ID: 1375080; OSTI ID: 1417604