Unstable behavior of the YBa2Cu4O8 superconductor under pressure
B. P. Singh, S. P. Pandey, R. K. Nayar, B. V. Kumaraswamy, A. V. Narlikar
DOI 10.1103/PhysRevB.46.3573 · Physical Review B
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Abstract
The effect of applied pressure on the YBa2Cu4O8 (Y 1:2:4) superconductor with a Tc of 78 K up to 50 kbar at ambient temperature is studied. It is observed that Y 1:2:4 undergoes a phase transformation resulting in the YBa2Cu3O7 (Y 1:2:3) orthorhombic phase with an increased Tc of 92 K. However, beyond 20 kbar, the Y 1:2:3 orthorhombic phase is further converted into the Y 1:2:3 tetragonal phase. The results show that when the pressurized specimens were heat treated again in flowing oxygen at 815 °C, the Y 1:2:4 phase with increased superconducting volume fraction is present, as evidenced by ac susceptibility measurements. These results are discussed in terms of solid-state reactions and the structural changes taking place at high pressure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| Bi2CaSr2Cu2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 1.42 GPa | midpoint |
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