Affordable Access

Publisher Website

Superconductivity at 105 K inTl0.5Pb0.5CaSr2- xLaxCu2O7

Physica C Superconductivity
Publication Date
DOI: 10.1016/0921-4534(91)90288-a
  • Physics


Abstract Substitution of La 3+ for Sr 2+ in the lattice Tl 0.5Pb 0.5Sr 2CaCu 2O 7 has been used to reduce the hole carrier concentration on the CuO 2 planes resulting in T c passing through a maximum at 105 K. This behaviour is similar to the previously reported effect of substitution of Y 3+ for Ca 2+ in the same parent material. However, in the La 3+-substituted series: (a) superconductivity is maintained to higher substitution levels; (b) the c-axis lattice parameter initially contracts at only 30% of the rate; and (c) the a-b-planes lattice parameter expands at 140% of the rate; compared to the Y 3+-substituted series. These effects are consequences of the differing sites of substitution-La 3+ on the Sr-O plane bounding the CuO 2 planes, and hence influencing the bridging oxygen atom; Y 3+ on the bare Ca 2+ site between the CuO 2 planes. The superconducting phase diagrams of T c versus substitution level are similar to the phase diagram for the CuO 2 planes established for La 2- x Sr x CuO 4.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times

More articles like this

A neutron diffraction study of the superconductor,...

on Materials Research Bulletin Jan 01, 1989

Synthesis and superconductivity of (Pb0.5Cd0.5)(Sr...

on Physica C Superconductivity Jan 01, 1996

Superconductivity in (Pb, Bi)2Sr2− xLaxCu2O6+ δ

on Physica C Superconductivity Jan 01, 1989

Superconductivity in Pb-based layered copper oxide...

on Physica C Superconductivity Jan 01, 1990
More articles like this..