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Pseudogap in electron-doped cuprates: Strong correlation leading to band splitting

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [4];  [5];  [5];  [5];  [6];  [6];  [7];  [6];  [8];  [9]
  1. Univ. of Tokyo (Japan); Univ. of Tokyo, Chiba (Japan)
  2. RIKEN, Saitama (Japan)
  3. Univ. of Tokyo (Japan); Tohoku Univ., Sendai (Japan)
  4. Univ. of Tokyo (Japan)
  5. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  6. Tohoku Univ., Sendai (Japan)
  7. Sophia University, Tokyo (Japan)
  8. Sophia University, Tokyo (Japan); Waseda Univ., Shinjuku (Japan); Toyota Physical and Chemical Research Institute, Aichi (Japan)
  9. Univ. of Tokyo (Japan); National Tsing Hua Univ., Hsinchu (Taiwan)
+ Show Author Affiliations
The pseudogap phenomena have been a long-standing mystery of the cuprate high-temperature superconductors. The pseudogap in the electron-doped cuprates has been attributed to band folding due to antiferromagnetic (AFM) long-range order or short-range correlation. We performed an angle-resolved photoemission spectroscopy study of the electron-doped cuprates Pr1.3−xLa0.7CexCuO4 showing spin-glass, disordered AFM behaviors, and superconductivity at low temperatures and, by measurements with fine momentum cuts, found that the gap opens on the unfolded Fermi surface rather than the AFM Brillouin zone boundary. The gap did not show a node, following the full symmetry of the Brillouin zone, and its magnitude decreased from the zone-diagonal to (π,0) directions, opposite to the hole-doped case. These observations were reproduced by cluster dynamical-mean-field-theory calculation, which took into account electron correlation precisely within a (CuO2)4 cluster. In conclusion, the present experimental and theoretical results are consistent with the mechanism that electron or hole doping into a Mott insulator creates an in-gap band that is separated from the upper or lower Hubbard band by the pseudogap.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT); National Science and Technology Coucil of Taiwan; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2575732
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 1 Vol. 122; ISSN 1091-6490; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

ARPES
Physical Sciences
Physics
cuprate
electron fractionalization
pseudogap