Singh, B. P. ; Pandey, S. P. ; Nayar, R. K. ; Kumaraswamy, B. V. ; Narlikar, A. V. (1992) Unstable behavior of the YBa2Cu4O8 superconductor under pressure Physical Review B: Condensed Matter and Materials Physics, 46 (6). pp. 3573-3580. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v46/i6/p3573_1
Related URL: http://dx.doi.org/10.1103/PhysRevB.46.3573
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 33122 |
| Deposited On: | 19 Mar 2011 05:33 |
| Last Modified: | 09 Jun 2011 11:31 |
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