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Pseudogap formation due to charge-transfer transition and Kondo effect
1Second Lab, LLC, 19-27 Inarimae, Tsukuba 305-0061, Japan.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 27, 2023
Summary
This study explores high-temperature superconductors, revealing that doping causes charge-transfer transitions and Kondo effects, which explain the pseudogap phenomenon in cuprates.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- High-temperature superconducting cuprates exhibit complex electronic states upon doping.
- Understanding the normal state is crucial for elucidating superconductivity mechanisms.
Purpose of the Study:
- Investigate the doping evolution of the electronic state in the three-band t-J-U model for cuprates.
- Explain the emergence of the pseudogap (PG) phenomenon.
Main Methods:
- Utilized the three-band t-J-U model.
- Analyzed the charge-transfer (CT) Mott-Hubbard transition.
- Examined the role of d-p band hybridization and chemical potential shifts.
Main Results:
- Doping induces a CT-type Mott-Hubbard transition in the d-electron.
- A reduced CT gap forms and shrinks with increased doping due to charge fluctuations.
- Increased d-p band hybridization leads to a Fermi liquid state, akin to the Kondo effect.
Conclusions:
- The pseudogap phenomenon in hole-doped cuprates arises from the interplay of CT transitions and Kondo-like effects.
- The electronic state evolution is strongly dependent on doping concentration and band hybridization.
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