Physics – Condensed Matter – Superconductivity
Scientific paper
2002-10-02
Physics
Condensed Matter
Superconductivity
21 pages,Text with Figures. To appear as a chapter in "Studies of High Temperature Superconductors", Vol. 46, ed. A.V. Narlika
Scientific paper
We reviewed our various results on rutheno-cuprate magneto-superconductors RuSr2GdCu2O8(Ru-1212) and RuSr2(Gd0.75Ce0.25)2Cu2O10(Ru-1222). It is observed, that it is difficult to control the oxygen content of Ru-1212, though the same is possible up to some extent for Ru-1222. Samples of both phases exhibited superconductivity, presumably in the CuO2 plane at low temperatures coexisting with magnetic ordering of Ru spins of predominantly antiferromagnetic type below 140 K having a ferromagnetic component appearing below 20 K. Electrical conductivity measurements indicate that the RuO2 layer takes part in conduction besides the CuO2 plane. The magnetic ordering temperature of Ru spins is seen as a clear hump in the resistivity measurements, establishing the magnetic spins interaction with the conduction carriers. Though the bulk physical property measurements exhibited the magneto-superconductivity, SAED results question the same to co-existence of the two at microscopic level. Our results indicate towards the fact that solid solutions of (Ru1-xCux)-1212, which can be superconducting with x > 0.5, but not magnetic may be precipitating with the stoichiometric magnetic Ru-1212 phase. Also highlighted in the review are various existing contradictions in the literature regarding physical properties of these systems. One such example is the results for Cp that are used as the evidence of bulk superconductivity in Ru-1212. We believe the establishment of superconductivity along with low-T ferromagnetic ordering of Ru spins in intrinsically phase-pure rutheno-cuprates is yet far from conclusive.
Awana* V. P. S.
Karppinen Maarit
Yamauchi Hidetaka
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