Browse > Article

Structure and Superconducting Properties of Ba-substituted (Ru,Cu)(Sr,Eu)$_2$(Eu,Ce)$_2Cu_2O_z$ System  

Lee, H.K. (Kangwon National University)
Publication Information
Progress in Superconductivity / v.13, no.1, 2011 , pp. 12-17 More about this Journal
Abstract
We investigated the effects of Ba and Cu co-substitution on the structural and superconducting properties of ($Ru_{1-y}Cu_y$)($Sr_{1.67-x}Ba_xEu_{0.33}$)($Eu_{1.34}Ce_{0.66}$)$Cu_2O_z$ samples. X-ray diffraction(XRD) reveals that single-phase samples can be obtained in the range from x = 0.1 to 0.2 for ($Ru_{0.5}Cu_{0.5}$)($Sr_{1.67-x}Ba_xEu_{0.33}$)($Eu_{1.34}Ce_{0.66}$)$Cu_2O_z$ and from y = 0.25 to 0.5 for ($Ru_{1-y}Cu_y$)($Sr_{1.47}Ba_{0.2}Eu_{0.33}$)($Eu_{1.34}Ce_{0.66}$)$Cu_2O_z$, respectively. All samples with compositions of ($Ru_{0.5}Cu_{0.5}$)($Sr_{1.67-x}Ba_xEu_{0.33}$) ($Eu_{1.34}Ce_{0.66}$)$Cu_2O_z$ (x = 0 - 0.33) show superconducting transition behavior and the onset transition temperature decreases slightly with increasing x in consistent with the change of hole concentration estimated from room temperature thermoelectric power measurements. The XRD and resistivity measurements for the ($Ru_{1-y}Cu_y$)($Sr_{1.47}Ba_{0.2}Eu_{0.33}$)($Eu_{1.34}Ce_{0.66}$) $Cu_2O_z$ system indicate that the partial substitution of Cu for Ru is necessary to form phase pure samples, but result in a small change in transition temperature in the single-phase region from x = 0.25 to 0.5.
Keywords
Ba substitution; (Ru,Cu)(Sr,Eu)$_2$(Eu,Ce)$_2Cu_2O_z$; superconductivity;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 H. K. Lee, "Effect of Cu substitution on superconductivity in $(Ru_{1-x}Cu_{x})Sr_{2}(Eu_{1.34}Ce_{0.66})Cu_{2}O_{z}$ system", Progress in Superconductivity 11, 67-71 (2009).
2 B. Fisher, J. Genossac, C. G. Kuper, L. Patlagan, G. M. Reisner and A. Knizhnik, "Effect of substituting calcium for yttrium on the properties of $YBa_{2}Cu_{3}O_{7-\delta}$", Phys. Rev. B 47, 6054-6059 (1993).   DOI
3 J. D. Jorgensen, O. Chmaissem, H. Shaked, S. Short, P. W. Klamut, P. W. Dabroski and J. L. Tallon, "Magnetic ordering in the superconducting weak ferromagnets $RuSr_{2}GdCu_{2}O_{8}$ and $RuSr_{2}EuCu_{2}O_{8}$", Phys. Rev. B 63, 054440(1) - 054440(5) (2001).
4 J. W. Lynn, Y. Chen, Q. Huang, S. K. Goh and G. V. M. Williams, "Search for magnetic order in superconducting $RuSr_{2}Eu_{1.2}Ce_{0.8}Cu_{2}O_{10}$", Phys. Rev. B 76, 014519(1)-014519(8) (2007).
5 H. K. Lee, J. M .Lee and Y. I. Kim, "Synthesis and superconductivity in Ba-doped $(Ru,Cu)(Sr,Nd)_{2}(Nd,Ce)_{2}Cu_{2}O_{z}$ compounds", J. Supercond. Nov. Magn. 23, 629-632 (2010).   DOI   ScienceOn
6 H. K. Lee and Y. I. Kim, unpublished.
7 L. Bauernfeind, W. Widder and H. F. Braun, "Ruthenium-based layered cuprates $RuSr_{2}LnCu_{2}O_{8}$ and $RuSr_{2}$($Ln_{1+x}Ce_{1-x}$)$Cu_{2}O_{10}$(Ln = Sm, Eu and Gd)", Physica C 254, 151 - 158 (1995).   DOI   ScienceOn
8 I. Felner, U. Asaf, Y. Levi, O. Millo, "Coexistence of magnetism and superconductivity in $R_{1.4}Ce_{0.6}.RuSr_{2}Cu_{2}O_{10-\delta}$ (R=Eu and Gd)", Phys. Rev. B 55, R3374-R3377 (1997).   DOI   ScienceOn
9 C. Bernhard, J. L. Tallon, Ch. Niedermayer, Th. Blasius, A. Golnik, E. Brucher, R. K. Kremer, D. R. Noakes, C. E. Stronach and E. J. Ansaldo, "Coexistence of ferromagnetism and superconductivity in the hybrid ruthenate-cuprate compound $RuSr_{2}GdCu_{2}O_{8}$ studied by muon spin rotation and dc magnetization", Phys. Rev. B 59, 14099-14107 (1999).   DOI