Subject: Physics Colloquium - PSB 161, Fri., Aug. 30, 2013, 4:30
the so-called hole-doped side of the phase diagram, the electron-doped side has been investigated with much less rigidity. In particular, while superconductivity is induced solely by chemical doping in hole-doped cuprates, doping alone is insufficient to induce superconductivity in electron doped cuprates. Besides, an additional annealing procedure is inevitable for the induction of superconductivity in those cuprates. Moreover, while the copper ion is five- and/or six-fold coordinated in hole-doped cuprates, it is square-planar for electron doped cuprates. Here we show that superconductivity in electron-doped cuprates can be induced even in the absence of chemical doping. This allows us to see the phase diagram of high-temperature superconducting cuprates under some new light.