Eight new high-temperature superconductors with the 1:2:4 structure
Donald E. Morris, Janice H. Nickel, John Y. T. Wei, Naggi G. Asmar, Jeffrey S. Scott, Ulrich M. Scheven, Charles T. Hultgren, Andrea G. Markelz, Jeffrey E. Post, Peter J. Heaney, David R. Veblen, Robert M. Hazen
DOI 10.1103/PhysRevB.39.7347 · Physical Review B
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Abstract
New high-temperature superconducting compounds RBa2Cu4O8 (R=Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm) which share the 1:2:4 structure of YBa2Cu4O8 are bulk synthesized using a new high-pressure oxygen technique. All compounds show substantial Meissner diamagnetism [(3–25)×10−4 emu/g at 20 K]. Critical temperatures (57–81 K) vary inversely with ion size (opposite to 1:2:3), and directly with orthorhombic distortion (which is much smaller than in corresponding 1:2:3 compounds). R2Ba4Cu7Ox compounds (with alternating blocks of 1:2:3: and 1:2:4) were also prepared. The variable oxygen stoichiometry of 1:2:3 is not shared by the 1:2:4 compounds.
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. | 80.4 | Pressure not reported | unknown |
| NdBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 57 | Pressure not reported | unknown |
| SmBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 69.3 | Pressure not reported | unknown |
| EuBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 68.9 | Pressure not reported | unknown |
| GdBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 73.4 | Pressure not reported | unknown |
| DyBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77.2 | Pressure not reported | unknown |
| HoBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77.4 | Pressure not reported | unknown |
| ErBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78.3 | Pressure not reported | unknown |
| TmBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78.6 | Pressure not reported | unknown |
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