Electro-transport and structure of 1-2-3 HTSC single crystals with different plane defects topologies
- 73 Downloads
In this work we study the structural and resistivity parameters of the 1-2-3 system HTSC single crystals by substituting yttrium to holmium and with a low (5%) aluminum doping. It was determined that in the case of non-stoichiometric samples, the structure of crystals, directly after the solution-melt growth, is close to tetragonal. In the process of additional oxygen saturation we observed a ferroelastic transition to orthorhombic phase, accompanied by the formation of a domain twin structure. The twin boundaries and the aluminum impurities are efficient scattering centers of normal carriers. At aluminum concentration y ≤ 0.5 the tweed structure is not formed.
KeywordsTwin Boundary Holmium High Critical Temperature Tweed Structure Aluminum Impurity
- 1.J.G. Bednorz, K.A. Müller, Z. Phys. B 64, 355 (1988)Google Scholar
- 15.D.M. Ginsberg (ed.), Physical Properties of the High Temperature Superconductors (Mir, Moscow, 1990)Google Scholar
- 18.V.V. Moshchalkov, I.G. Muttik, N.A. Samarin, Low Temp. Phys. 14, 988 (1988)Google Scholar