Somasundaram, P and Nanjundaswamy, KS and Umarji, AM and Rao, CNR (1988) Structure and superconducting properties of $YBa_{2-x}Ln_xCu_3O_{7\pm\delta}$ (Ln = La, Nd or Gd) and $(Ln,Ln')_{3−x}Ba_{3+x}Cu_6O_{14+\delta}$. In: Materials Research Bulletin, 23 (8). pp. 1139-1144.
![]() |
PDF
properties.pdf Restricted to Registered users only Download (265kB) | Request a copy |
Abstract
In $YBa_{2-x}Ln_xCu_30_{7\pm\delta}$ (Ln = La, Nd or Gd), the structure becomes tetragonal with increase in x and the $T_c$ of the orthorhombic phase decreases with x. Members of $(Ln,Ln')_{3_x}Ba_{3+x}CU_60_{14+\delta}$ (Ln = Nd or Gd)are generally tetragonal and non superconducting. $Ln_3Ba_3Cu_60_{14+\delta}$ and $LnBa_2Cu_30_7\pm\delta$ (Ln =Nd or Gd) prepared by low-temperature decomposition of nitrates are also tetragonal and nonsuperconducting. Random occupation of Ba in $LnBa_2Cu_30_{7\pm\delta}$ or $La_3Ba_3Cu_60_{14+\delta}$ appears to favour the tetragonal structure. Furthermore oxygen is less labile when La partly substituting Ba in these oxides.
Item Type: | Journal Article |
---|---|
Publication: | Materials Research Bulletin |
Publisher: | Elsevier Science Ltd |
Additional Information: | Copyright of this article belongs to Elsevier Science Ltd. |
Keywords: | Superconductors;oxides;rare-earths;barium;copper |
Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
Date Deposited: | 28 Feb 2008 |
Last Modified: | 19 Sep 2010 04:42 |
URI: | http://eprints.iisc.ac.in/id/eprint/13140 |
Actions (login required)
![]() |
View Item |