Preparation, characterization, and superconducting properties of tetragonal LaBaCaCu3O7+δ
J. L. Peng, P. Klavins, R. N. Shelton, H. B. Radousky, P. A. Hahn, L. Bernardez, M. Costantino
DOI 10.1103/PhysRevB.39.9074 · Physical Review B
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Abstract
Samples of LaBaCaCu3O7+δ were prepared by standard solid-state reactions. X-ray powder diffraction data taken in the temperature range 6–300 K reveal no structural transition. Thermogravimetric analysis was used to determine the oxygen content δ. Both magnetization and resistivity measurements indicate sharp superconducting transitions (ΔT<4 K) at 78 K for samples with δ=0±0.05. Broad transitions were always observed for samples with δ<0, although the Tc onsets remained essentially constant. A sample with excess oxygen (δ>0) achieved by high-pressure oxygen annealing showed a broad transition, as well as a Tc which was depressed by 10 K. We consider these experimental results in the context of ordering of the cations La, Ba, and Ca as well as oxygen sublattice ordering. We estimate the electronic coefficient of specific heat γ and the Ginzburg-Landau parameters ξGL, λGL, and κGL from the measured temperature dependence of Hc2 and the Pauli susceptibility.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaBaCaCu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure not reported | unknown |
| LaBaCaCu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure not reported | unknown |
| LaBaCaCu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78.5 | Pressure not reported | unknown |
| La1.5(Ba1-xCax)1.5Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | onset |
| LaBa2Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| LaBa2Cu3O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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