Low Temperature Physics: 33, 257 (2007); https://doi.org/10.1063/1.2719963 (7 pages)
Fizika Nizkikh Temperatur: Volume 33, Number 2-3 (February 2007), p. 345-353 ( to contents , go back )
Electrical resistance and magnetic properties of double doped ceramics La1,85-4/3xSr0,15+4/3xCu1-xMnxO4
A.V. Tkach, A.I. Ponomarev, T.B. Charikova, A.O. Tashlykov
Institute of Metal Physics , S. Kovalevskoyi st. 18, Ekaterinburg 620219, Russia
V. L. Kozhevnikov
Institution Chemistry of Solids RAN Pervomayskaya st.91, Ekaterinburg, 620219, Rossia
Received September 7, 2006
Resistive and magnetic measurements of ceramics La1,85-4/3xSr0,15+4/3xCu1-xMnxO4 with x = 0.02, 0.04, 0.06, and 0.08 are made. It is found, that the onset and end temperatures of the superconductive transition are slightly dependent on x in the given concentration range. The resisitive properties reveal a combination of intragranular metallic conductivity (or superconductivity) with the intergranular hopping transport. Superconductivity at low temperatures seems to coexist with two distinct magnetic phases.
PACS: 74.72.–h Cuprate superconductors (high-Tcand insulating parent compounds);
Key words: resistive and magnetic properties of ceramics, superconductive transition.