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TlBa2−xLa2+xCu2O9±δ: a new 42 K superconductor, intergrowth of “1201” and “0201” structures

✍ Scribed by C. Martin; A. Maignan; M. Huve; M. Hervieu; C. Michel; B. Raveau

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 737 KB
Volume: 179
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(91)90003-h

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✦ Synopsis

A new superconductive thallium coprate, TlBal.6La2.4Cu209 +a has been isolated. The structure of this oxide has been studied by HREM and powder X-ray diffraction. It crystallizes in the space group I4/mmm with a=3.8110(2) A and c=31.556(2) A. The structure consists of a regular intergrowth of single and double rock salt layers with single perovskite layers. It can be described as a regular intergrowth of La2CuO4-and TIBa2CuOs-type structures. Very few crystals exhibit extended defects. The magnetic susceptibility measurements show a Tc of 35 K for the as-synthesized material, which can he increased up to 42 K by Ar/H2 annealing at low temperature.

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