caa a22 4500 445382775 CHVBK 20180317143022.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10948-010-0837-2 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0837-2 Lee H. Department of Physics, Kangwon National University, 200-701, Chuncheon, Republic of Korea aut Effect of Co Substitution on the Structure and Superconducting Properties of GaSr2(Tm,Ca)Cu2O z [Elektronische Daten] [H. Lee] The crystal structures of two samples with nominal compositions of GaSr2(Tm0.7Ca0.3)Cu2O z and (Ga0.65Co0.35)Sr2(Tm0.7Ca0.3)Cu2O z have been analyzed by using neutron powder diffraction techniques to clarify the structural mechanisms associated with changes in superconducting behavior. Unlike for the Co-free sample, which does not show superconductivity, the Co-doped sample exhibits superconductivity around 45 K. The Rietveld refinement data reveal that both samples exhibit the 1212 structure with space group Ima2 and the Co atoms exclusively substitute for the Ga atoms in the GaO4 tetrahedron located on the chain sites of the 123 parent structure. The improvement in T c of the Co-doped sample, compared to that of the undoped sample, is discussed in connection with the change in structural disorder and the change in hole concentration on the superconducting planes. Springer Science+Business Media, LLC, 2010 Ga-1212 nationallicence Co substitution nationallicence Superconductivity nationallicence Neutron powder diffraction nationallicence Rietveld refinement nationallicence Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1381-1384 1557-1939 24:5<1381 2011 24 10948 https://doi.org/10.1007/s10948-010-0837-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0837-2 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Lee H. Department of Physics, Kangwon National University, 200-701, Chuncheon, Republic of Korea aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1381-1384 1557-1939 24:5<1381 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer