Crystal structure of a new high-Tc TlBa2Ca3Cu4 O11 superconductor by high-resolution electron microscopy
H. Ihara, R. Sugise, K. Hayashi, N. Terada, M. Jo, M. Hirabayashi, A. Negishi, N. Atoda, H. Oyanagi, T. Shimomura, S. Ohashi
DOI 10.1103/PhysRevB.38.11952 · Physical Review B
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Abstract
The crystal structure of a new high-Tc TlBa2Ca3Cu4 O11 (1:2:3:4) superconductor was studied by a high-resolution electron microscopic measurement. The electron diffraction patterns give a simple tetragonal lattice with the lattice constants of a=b=3.9 Å and c=19 Å. The lattice image viewed along [010] showed clearly the single Tl-O layer alternating with four Cu-O sheets. The A-site layers of Ba or Ca atoms also alternate with the B-site layers of Tl or Cu atoms as in the layered perovskite compound ABOx. Since oxygen sites in the Ca layer are vacant, the structure is one of the oxygen-deficient perovskite. This phase has a new space group of P4mmm different from the previous cuprate oxide superconductors and it has a large new superconductor family of TlBa2Can−1CunO2n+3 (n=1,2,3,4,5,…).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TlBa2Ca3Cu4O11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 121.9 | Pressure not reported | midpoint |
| TlBa2Ca3Cu4O11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | zero_resistance |
| TlBa2Ca3Cu4O11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 122.1 | Pressure not reported | unknown |
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