Abstract
The compounds of the type Eu(Ba2-xEux)Cu3O7+z with x ranging from 0.0 to 0.5 have been prepared and investigated from structure and superconductivity view point. The compound with x = 0 is the well known 1:2:3 orthorhombic superconducting compound EuBa2Cu3O7-y with mid-point Tc of 87K. It is observed that in the Eu excess system, the orthorhombicity decreases with increasing x, and the compounds with x≥0.2 appear tetragonal. The superconducting transition temperature decreases with increasing x: the sample with x = 0.4 is non-superconducting down to 4.2K. 151Eu Mossbauer studies reveal that all the europium ions are in a trivalent non-magnetic state. The Eu at the regular site and also the one substituting at the divalent Ba site show nearly the same isomer shift. In this respect the two sites are very similar. The decrease in Tc with increasing x is not due to the magnetism of the rare earth ion but, has to be attributed to the structure and electronic effects.
Original language | English |
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Pages (from-to) | 531-534 |
Number of pages | 4 |
Journal | Solid State Communications |
Volume | 68 |
Issue number | 6 |
DOIs | |
Publication status | Published - Nov 1988 |
Externally published | Yes |
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry