Europhys. Lett, 45 (3), pp. 387-392 (1999)
Superconductivity in two-leg spin ladders
L. Leonyuk 1, G.-J. Babonas 2, R.
Szymczak 3, H. Szymczak 3, M. Baran 3
A. Reza 2, V. Maltsev 1, L. Shvanskaya 1 and V. Rybakov 1
1 Moscow State University - 119899 Moscow, Russia
2 Semiconductor Physics Institute - 2600 Vilnius, Lithuania
3 Institute of Physics - 02-668 Warsaw, Poland
(received 10 November 1997; accepted in final form 25 November 1998)
PACS. 74.72-h - High- compounds.
PACS. 75.20-g - Diamagnetism and paramagnetism.
PACS. 78.20-e - Optical properties of bulk materials and thin films.
The single crystals with two-leg spin-ladder-type structure were investigated. According to the structural, magnetic, optical and resistivity data obtained, the studied crystals were shown, for the first time, to be high- superconductors (=80 K) which belong to the class of cuprates with incommensurate-type structure.