Effect of oxygen-doping on Bi2Sr2Ca2Cu3O10+δ vortex matter: Crossover from electromagnetic to Josephson interlayer coupling
A. Piriou, Y. Fasano, E. Giannini, Ø. Fischer
DOI 10.1103/PhysRevB.77.184508 · Physical Review B
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Abstract
We study the effect of oxygen-doping on the critical temperature Tc, the vortex matter phase diagram, and the nature of the coupling mechanism between the Cu-O layers in the three-layer Bi2Sr2Ca2Cu3O10+δ (Bi-2223) compound. Contrary to previous reports, in the overdoped (OD) regime, we do find a variation in Tc by increasing the oxygen partial pressure of the postannealing treatment. This variation is less significant than in the bilayer compound Bi2Sr2CaCu2O10+δ (Bi-2212) and does not follow the universal Tc vs δ relation. Magnetic measurements reveal that increasing δ enlarges the field and temperature stability of the Bragg glass phase. These findings imply that the interlayer coupling between Cu-O layers enhances with δ. The anisotropy parameter estimated from directional first-penetration field measurements monotonously decreases from 50 in the underdoped (UD) to 15 in the OD regimes. However, the in-plane penetration depth presents a boomerang-type behavior with δ, reaching its minimum value close to optimal doping. These two facts lead to a crossover from a Josephson OD to electromagnetic UD-dominated coupling of adjacent Cu-O layers in the vicinity of optimal doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110.5 | Pressure not reported | onset |
| Bi2Sr2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | onset |
| Bi2Sr2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 107 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.5 | Pressure not reported | onset |
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