Crystallographic phases and transport properties in the superconducting Tm-Ba-Cu-O compound system
J. P. Andreeta, H. C. Basso, E. E. Castellano, J. N. H. Gallo, A. A. Martin, O. E. Piro
DOI 10.1103/PhysRevB.36.5588 · Physical Review B
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Abstract
The Tm-Ba-Cu-O compound system becomes a superconductor at a critical temperature Tc, measured at the midpoint of the resistive transition, of 92 K. From x-ray diffraction techniques, the material seems to be composed of two phases. The dominating (opaque) phase (≳94% in weight) is the superconducting TmBa2Cu3O6+x oxide (isostructural with superconducting oxygen-deficient YBa2Cu3O6+x), which crystallizes in the orthorhombic pmmm space group with a=3.819(2), b=3.889(2), c=11.669(7) Å, and Dc=7.21(1) gcm−3. The other (green) phase is the semiconducting Tm2BaCuO5 oxide [space group Pbnm or Pbn21; a=7.079(8), b=12.09(1), c=5.633(2) Å, and Dc=8.53(2) gcm−3] isostructural with the series of L2BaCuO5 (L=Y,Sm,Eu,Gd,Dy,Ho,Er,Yb) oxides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TmBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | midpoint |
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