Overdoping effects in Bi2Sr2CaCu2O8+δ: From electromagnetic to Josephson interlayer coupling
V. F. Correa, E. E. Kaul, G. Nieva
DOI 10.1103/PhysRevB.63.172505 · Physical Review B
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Abstract
We report a study of magnetic, structural, and transport properties of Bi2Sr2CaCu2O8+δ single crystals with different degrees of overdoping. The overdoping is achieved by high oxygen pressure (up to 190 bar) annealing. The parameters used to characterize the overdoping were the crystallographic c-axis lattice parameter and the superconducting transition temperature. The irreversibility line Hil and the characteristic field of the order-disorder transition of the vortex structure Hsp were obtained from dc magnetization with the applied magnetic field perpendicular to the CuO2 planes. The large overdoped range has two well-defined regions: (i) close to the optimal doping the interlayer coupling is mainly electromagnetic and Hsp is given by Φ0/λab2(0) [λab(0) is the in-plane penetration depth at T=0 K], and (ii) with further overdoping the Josephson interlayer coupling becomes relevant, so Hsp deviates from Φ0/λab2(0) and is fixed by the effective-mass anisotropy. All the results indicate an increase in the coupling between CuO2 planes with overdoping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | unknown |
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