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    Title: Anomalous Zn- and Ni-substitution effects on superconductivity in the superconducting weak ferromagnets RuSr2RCu2O8 (R = Gd, Eu)
    Authors: Ling, D.C.;Wu, S.L.;Lin, M.H.;Chien, F.Z.
    Contributors: 淡江大學物理學系
    Keywords: Impurity-induced Tc suppression;Ruthenocuprate;Superconducting weak ferromagnet
    Date: 2010-12
    Issue Date: 2012-06-14 09:24:08 (UTC+8)
    Publisher: Amsterdam: Elsevier BV * North-Holland
    Abstract: The effect of magnetic Ni and non-magnetic Zn impurities on superconducting transition temperature Tc in RuSr2R(Cu1−x(Ni, Zn)x)2O8 with R = Gd or Eu (Ni- and Zn-substituted Ru1212Gd(Eu)) was extensively studied. It is found that the suppression rate dTc/dx of RuSr2R(Cu1−x(Ni, Zn)x)2O8 is comparable to that of underdoped YBa2(Cu1−x(Ni, Zn)x)3O7−δ. The suppression of superconductivity in Ni-substituted Ru1212Eu samples is more significant than that in Zn-substituted ones, indicative of Ni being a more effective pair-breaker than Zn. In strong contrast, the magnetic Ni impurity atoms have a weaker effect on superconductivity than non-magnetic Zn atoms in Ru1212Gd, similar to what was observed in the high-Tc cuprates. These intriguing findings strongly suggest that the impurity-induced local disturbance of the 3d-spin correlation at Cu sites around Ni/Zn is distinctly different between Ru1212Gd and Ru1212Eu.
    Relation: Physica C: Superconductivity 470(1), pp.S99–S100
    DOI: 10.1016/j.physc.2009.11.179
    Appears in Collections:[物理學系暨研究所] 期刊論文

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