Ordering of oxygen into chains and distribution of hole density in YBa2Cu3O1+x

✍ Scribed by S. Pekker; A. Jánossy; A. Rockenbauer

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 527 KB
• Volume: 181
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)90328-v

✦ Synopsis

A series of Yo.999Gdo.oolBa2Cu306+x compounds is studied by Gd 3+ EPR in the full range of oxygen content. The fine structure is modified by the hole distribution in the Cu (2)02 layers mirroring oxygen chains in the Cu ( 1 )Ox layers. The fine structure of 5 differently occupied first-neighbour Cu( 1 )Ox oxygen chain configurations surrounding the Gd 3+ ions is resolved. Formation of chains begins at a threshold oxygen content, Xo = 0.14. For x> 0.14 oxygen in Cu ( I )Ox planes is ordered mainly into chains, the amount of disordered oxygen decreases with increasing x. The EPR intensities are in quantitative agreement with a model calculation of 2-dimensionally ordered oxygen chains.