Anomalous Zn- and Ni-substitution effects on superconductivity in the superconducting weak ferromagnets RuSr2RCu2O8 (R = Gd, Eu)

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題名:	Anomalous Zn- and Ni-substitution effects on superconductivity in the superconducting weak ferromagnets RuSr2RCu2O8 (R = Gd, Eu)
作者:	Ling, D.C.;Wu, S.L.;Lin, M.H.;Chien, F.Z.
貢獻者:	淡江大學物理學系
關鍵詞:	Impurity-induced Tc suppression;Ruthenocuprate;Superconducting weak ferromagnet
日期:	2010-12
上傳時間:	2012-06-14 09:24:08 (UTC+8)
出版者:	Amsterdam: Elsevier BV * North-Holland
摘要:	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.
關聯:	Physica C: Superconductivity 470(1), pp.S99–S100
DOI:	10.1016/j.physc.2009.11.179
顯示於類別:	[物理學系暨研究所] 期刊論文

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