# Structure and superconducting properties of $YBa_{2-x}Ln_xCu_3O_{7\pm\delta}$ (Ln = La, Nd or Gd) and $(Ln,Ln')_{3−x}Ba_{3+x}Cu_6O_{14+\delta}$

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.

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## 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 Copyright of this article belongs to Elsevier Science Ltd. Superconductors;oxides;rare-earths;barium;copper Division of Chemical Sciences > Materials Research Centre Dipti Chaurasia 28 Feb 2008 19 Sep 2010 04:42 http://eprints.iisc.ac.in/id/eprint/13140