SmBa2Cu3O7−δ ceramics processed under oxygen pressure of 250 bar: Enhancement of intragrain superconducting properties
Z. Bukowski, T. Plackowski, C. Sul/kowski, D. Wl/osewicz, A. J. Zaleski
DOI 10.1103/PhysRevB.53.2781 · Physical Review B
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Abstract
Polycrystalline samples of SmBa2Cu3O7−δ have been processed under oxygen pressure of 250 bar. Several of their properties typical for highly oxygenated ‘‘123’’ phases were revealed: Tc=96 K as measured by ac magnetic susceptibility, high orthorhombic distortion of the unit cell, negative thermopower at room temperature, an exceptionally high specific-heat jump at Tc, highly irreversible magnetization at 4.2 K, and almost 100% diamagnetic signal at 77 K. Surprisingly, the value of electrical resistivity in the normal state and its temperature dependence were characteristic for semiconducting materials. The superconducting transition was observed as a sharp drop followed by a long tail, which was strongly dependent on the measuring current. Thus, SmBa2Cu3O7−δ processed under an elevated oxygen pressure revealed intragrain properties similar to that of the best YBa2Cu3O7−δ samples, however, poor intergrain electrical conductivity was observed. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SmBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure unresolved | onset |
| SmBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure unresolved | onset |
| SmBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure unresolved | onset |
| LaBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | zero_resistance |
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