Torardi, C. C. ; Subramanian, M. A. ; Gopalakrishnan, J. ; Sleight, A. W. (1989) Alkali-metal substituted La2CuO4: structures of La2-xMxCuO4 (M = Na, K; x ≈ 0.2) Physica C: Superconductivity, 158 (3). pp. 465-470. ISSN 0921-4534
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/092145...
Related URL: http://dx.doi.org/10.1016/0921-4534(89)90245-1
Abstract
The structures of akali-metal substituted La2CuO4 have been analyzed by profile refinement of neutron powder diffraction data. At room temperature, La1.8Na0.2CuO4 (Tc ≈ 30 K) has the body-centered tetragonal K2NiF4 structure as found for the akaline-earth metal doped analogs such as La1.85M0.15CuO4 (M = Sr, Ba). Below the superconducting transition temperature, the sodium-containing phase clearly exhibits the orthorhombic La2CuO4 structure. Although the structure of non-superconducting La1.8K0.2CuO4 can be fitted with tetragonal symmetry, there is evidence for a weak orthohombic distortion.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 12406 |
| Deposited On: | 10 Nov 2010 06:22 |
| Last Modified: | 03 Jun 2011 05:00 |
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