Date: May 30,1994
H. Takagi, R.J. Cava, M. Marezio, B. Batlogg, J.J. Krajewski, W.F. Peck, Jr., P. Bordet, D.E. Cox, "Disappearance of superconductivity in overdoped La2- xSrxCuO4 at a structural phase boundary," Physical Review Letters, 68:3777-80, 1992.
Robert J. Cava (AT&T Bell Laboratories, Murray Hill, N.J.): "One of the obstacles to understanding the still-elusive underlying cause of high-Tc superconductivity is the finding of a `model system' in which the physical properties are clear-cut, well-characterized, and undisputed. Although more than 30 distinct copper oxide ceramics are now known to be superconducting at high temperatures, virtually all are so complex--either chemically or electron- ically--that they are useless for providing the kinds of fundamental information that theorists need as an anchor for their thinking. Strontium-doped La2CuO4, one of the first copper oxide-based superconductors discovered, and the subject of our publication, is widely considered to be the simplest high-Tc superconductor known.