Effects of oxygen and strontium vacancies on the superconductivity of single crystals of Bi2Sr2−xCuO6−y
Edward Sonder, B. C. Chakoumakos, B. C. Sales
DOI 10.1103/PhysRevB.40.6872 · Physical Review B
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Abstract
Single crystals of Bi2Sr2−xCuO6−y (2201 phase) were grown from CuO-rich melts. The Sr concentration in the crystals was varied from x=0.1 to 0.5 by adjusting the starting composition of the melt, and the oxygen content of the crystals was reversibly adjusted between y=0 and 0.5 by an appropriate heat treatment of the crystals in a thermogravimetric system. With decreasing Sr content the superconducting transition temperature, Tc, of the crystals decreased rapidly from 9 K to below 4.2 K, and the resistivity in the a-b plane changed from metallic (linear in T from 30 to 300 K) to semiconducting. Reducing the oxygen content in the crystals had a similar effect on the resistivity. Only crystals with close to the maximum oxygen content (y=0) were superconducting, and removal of oxygen from previously superconducting crystals resulted in a rapid decrease of Tc and the eventual loss of superconductivity (Tc<4.2 K). A bond-valence sum analysis suggests that oxygen is removed from the Bi2O2 layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2-xCuO6-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | onset |
| Bi2Sr1.85CuO6-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | onset |
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