Fluctuation conductivity in the 110-K phase of Ni-doped (Bi,Pb)-Sr-Ca-Cu-O superconductors
Natsuki Mori, John A. Wilson, Hajime Ozaki
DOI 10.1103/PhysRevB.45.10633 · Physical Review B
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Abstract
The fluctuation conductivity above Tc was measured in (Bi,Pb)-Sr-Ca-(Cu1−x,Nix)-O superconductors having the 110-K phase. The temperature dependence of the paraconductivity can be described by a power law following Aslamazov-Larkin theory. For nondoped (x=0) samples, the conductivity data show a two-dimensional fluctuation of the order parameter, whereas Ni-doped samples show lower-dimensional fluctuations and reduced widths of the resistive transition. The critical exponent of the power law and its amplitude are well correlated with Tc, which decreases monotonously with increasing x up to ∼0.02 and then saturates around 90 K over the range 0.02≲x≤0.1. The observed crossover from two- to one- (or lower-) dimensional behavior with increasing Ni dopant level may be related to a fractal nature for the system. The Tc reduction of the present system is discussed from the standpoint of pair-breaking effects induced by the Ni doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Bi,Pb)2Sr2Ca3(Cu1-xNix)3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure unresolved | onset |
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