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Doping-dependent phonon anomaly and charge-order phenomena in the HgBa 2 CuO 4 + δ and HgBa 2 CaCu 2 O 6 + δ superconductors

Journal Article · · Physical Review B
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [6];  [2];  [2];  [2];  [7];  [7];  [8];  [9];  [2];  [10]
  1. Peking Univ., Beijing (China); University of Minnesota
  2. Univ. of Minnesota, Minneapolis, MN (United States)
  3. Peking Univ., Beijing (China)
  4. Peking Univ., Beijing (China); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. AGH University of Science and Technology, Krakow (Poland); Technische Univ. Wien (Austria)
  6. Max Planck Inst. for Solid State Research, Stuttgart (Germany); Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin (Germany)
  7. Canadian Light Sources, Inc., Saskatoon, SK (Canada)
  8. Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin (Germany)
  9. Univ. of Minnesota, Minneapolis, MN (United States); AGH University of Science and Technology, Krakow (Poland); Technische Univ. Wien (Austria)
  10. Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Using resonant x-ray diffraction and Raman spectroscopy, we study charge correlations and lattice dynamics in two model cuprates, HgBa 2 CuO 4 + δ and HgBa 2 CaCu 2 O 6 + δ . We observe a maximum of the characteristic charge order temperature around the same hole concentration (p ≈ 0.09) in both compounds, and concomitant pronounced anomalies in the lattice dynamics that involve the motion of atoms in and/or adjacent to the CuO2 layers. These anomalies are already present at room temperature, and therefore precede the formation of the static charge correlations, and we attribute them to an instability of the CuO2 layers. Our finding implies that the charge order in the cuprates is an emergent phenomenon, driven by a fundamental variation in both lattice and electronic properties as a function of doping.
Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
Canadian Light Source; European Research Council (ERC); National Natural Science Foundation of China (NNSFC); National Science Center (NCN), Poland; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0016371
OSTI ID:
1656778
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 101; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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