研究目的
To analyze the influence of the hole density, the out-of-plane or in-plane disorder, and the isotopic oxygen mass on the zero temperature energy gap in YCBCZO and LSHCO superconductors and to determine the relationship between the zero temperature energy gap and the pseudogap temperature or the critical temperature.
研究成果
The study found that the zero temperature energy gap is closely correlated with the pseudogap temperature but not with the critical temperature in YCBCZO and LSHCO superconductors. The value of the ratio RΔ can vary widely with changes in chemical composition, while the parameter RΔ? remains relatively constant. An analytical formula linking the energy gap and the pseudogap temperature was also presented.
研究不足
The study is theoretical and does not involve experimental validation. The results are based on numerical calculations and assumptions about the pairing mechanisms in cuprates.
1：Experimental Design and Method Selection:
The study is based on theoretical models that assume the pairing mechanism in cuprates is induced by the electron-phonon interaction and the electron-electron correlations renormalized by the phonons. The influence of the quasi-two-dimensionality of the electron system on the physical properties of the studied compounds has been taken into account.
2：Sample Selection and Data Sources:
The study considers Y1???Ca??Ba2(Cu1???Zn??)3O7??? (YCBCZO) and La1.96???Sr??Ho0.04CuO4 (LSHCO) superconductors with varying hole densities, degrees of disorder, and isotopic oxygen masses.
3：96???Sr??Ho04CuO4 (LSHCO) superconductors with varying hole densities, degrees of disorder, and isotopic oxygen masses.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The study is theoretical and does not specify experimental equipment or materials.
4：Experimental Procedures and Operational Workflow:
The study involves numerical calculations based on a fundamental thermodynamic equation that determines the properties of the high-temperature superconducting state of d-wave symmetry.
5：Data Analysis Methods:
The analysis involves determining the values of the dimensionless ratios RΔ≡2Δ(0)/???????? and RΔ?≡2Δ(0)/??????? and deriving an analytical formula that binds the energy gap and the pseudogap temperature.
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