Crystallographic, thermodynamic, and transport properties of the Bi2Sr3−xCaxCu2O8+δ superconductor

G. S. Grader; E. M. Gyorgy; P. K. Gallagher; H. M. O'Bryan; D. W. Johnson, Jr.; S. Sunshine; S. M. Zahurak; S. Jin; R. C. Sherwood

doi:10.1103/PhysRevB.38.757

Crystallographic, thermodynamic, and transport properties of the Bi2Sr3−xCaxCu2O8+δ superconductor

G. S. Grader, E. M. Gyorgy, P. K. Gallagher, H. M. O'Bryan, D. W. Johnson, Jr., S. Sunshine, S. M. Zahurak, S. Jin, R. C. Sherwood

DOI 10.1103/PhysRevB.38.757 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We have demonstrated the presence of a single-phase solid solution for the Bi2Sr3−xCaxCu2O8+δ superconductor, in the 1.25≤x≤2.0 range. The lattice parameters and melting points vary monotonically with x, both increasing towards the Sr-rich composition. This monotonic variation of the lattice parameters extends into the 0.8≤x≤2.2 range, but the material is multiphased outside the 1.25≤x≤2.0 limit. Superconducting onsets in the ranges of 70-89 and 108-118 K have been obtained; however, the exact results are very sensitive to processing parameters. Magnetization measurements indicate high intragranular current densities (Jc) at 5 K of ∼5×106 A/cm2. The actual transport Jc is low (≅ 70 A/cm2 at 4 K) and exhibits a strong field dependence similar to the behavior of the YBa2Cu3O7 superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr3-xCaxCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	70	Pressure not reported	onset
Bi2Sr3-xCaxCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure not reported	onset
Bi2Sr3-xCaxCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	108	Pressure not reported	onset
Bi2Sr3-xCaxCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	118	Pressure not reported	onset
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown