Anisotropic superconducting properties of aligned (Bi,Pb)2Can−1Sr2CunO2n+4+δ powders (n=1,2,3) with Tc=32, 94, and 110 K
J. B. Shi, B. S. Chiou, H. C. Ku
DOI 10.1103/PhysRevB.43.13001 · Physical Review B
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Abstract
The anisotropic superconducting properties of aligned powders embedded in epoxy for bismuth copper oxides with the compositions (Bi1.6Pb0.4)(Sr1.5La0.5)CuO6+δ (n=1, Tc=32 K), Bi2Ca1.2Sr1.8Cu2O8+δ (n=2, Tc=94 K), and (Bi1.85Pb0.15)Ca2.2Sr1.8Cu3O10+δ (n=3, Tc=110 K) are reported. These c-axis-aligned samples were prepared in a 9.4-T applied magnetic field at room temperature. The temperature dependence of the anisotropy ratio χc(T)/χab(T) in the superconducting state is derived from both zero-field-cooled and field-cooled data using a small applied field H (less than or equal to the lower critical field Hc1) parallel and perpendicular to the orthorhombic c axis. A highly anisotropic χc/χab ratio was observed for all three systems, the maximum value of χc/χab=9.8 at 5 K and 10.8 at 85 K for the 2:2:2:3 compound (Bi1.85Pb0.15)Ca2.2Sr1.8Cu3O10+δ was observed. The field dependence of the anisotropy ratio χc(H)/χab(H) for the 2:1:2:2 compound Bi2Ca1.2Sr1.8Cu2O8+δ up to 5 kG is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Bi1.6Pb0.4)(Sr1.5La0.5)CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
| Bi2Ca1.2Sr1.8Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | onset |
| (Bi1.85Pb0.15)Ca2.2Sr1.8Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
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