Role of orthorhombic distortion, second-nearest-neighbor hopping, and Coulomb repulsion on the superconducting transition temperature and isotope-shift exponent

Sujit Sarkar; S. Basu; A. N. Das

doi:10.1103/PhysRevB.51.12854

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Role of orthorhombic distortion, second-nearest-neighbor hopping, and Coulomb repulsion on the superconducting transition temperature and isotope-shift exponent

Sujit Sarkar, S. Basu, A. N. Das

DOI 10.1103/PhysRevB.51.12854 · Physical Review B

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Abstract

The effect of orthorhombic distortion, second-nearest-neighbor hopping, and Coulomb repulsion on the superconducting transition temperature (Tc) and the isotope-shift exponent (α) are studied within the van Hove singularity scenario. The orthorhombic distortion decreases the maximum value of Tc (Tcm) and increases the minimum value of α (αmin). With increasing second-nearest-neighbor hopping Tcm rises sharply while α remains almost unaltered. Coulomb repulsion suppresses both Tc and α. A study of Δ(T)/Δ(0) and 2Δ(0)/KBTc reveals that the ratios do not depend on the orthorhombic distortion and second-nearest-neighbor hopping parameter.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown