The R dependence of the phase diagram of Bi2Sr2−xRxCuOy and its implication on high temperature superconductivity

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We have studied how the phase diagram of the Bi2Sr2−xRxCuOy system depends on the rare earth element R. The angle-resolved photoemission spectroscopy (ARPES) measurement revealed that the pseudogap is larger for the R=Eu sample than the R=La sample when compared at the same carrier concentration while the transition temperature Tc of the R=La sample is larger. This implies that changing the R element to one with a smaller ionic radius stabilizes the pseudogap phase and suppresses at the same time the high-Tc superconducting phase.