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Superconductivity (SC) sets in RuSr 2 GdCu 2 O 8

Pressure Effects in the Superconductivity of Pure and Rh-doped RuSr 2 GdCu 2 O 8 Milton S. Torikachvili, San Diego State Univ., DMR-0306165. Superconductivity (SC) sets in RuSr 2 GdCu 2 O 8

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Superconductivity (SC) sets in RuSr 2 GdCu 2 O 8

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  1. Pressure Effects in the Superconductivity of Pure and Rh-doped RuSr2GdCu2O8Milton S. Torikachvili, San Diego State Univ.,DMR-0306165 Superconductivity (SC) sets in RuSr2GdCu2O8 near Tc≈50 K, which is below the magnetic ordering temperature Tm≈133 K. As rhodium is partially substituted for ruthenium, the value of Tc drops, and the SC state in these polycrystalline specimens becomes more granular. Upon cooling, the transition to the SC state becomes a two-step process as seen in the electrical resistivity measurements. Following a first drop in resistance due to the onset of SC in the grains, the resistance drops to zero only when the inter-granular regions become SC as well. The effect of hydrostatic pressure is to raise the onset temperature of both, intra- and inter-granular SC. The rate of increase dTc/dP of ≈0.11-0.18 K/katm is 2-3 lower than in YBa2Cu3O7, suggesting competition between SC and magnetism. Upper panel - electrical resistvity vs temperature in Ru1-xRhxSr2GdCu2O8. Lower panel - effect of hydrostatic pressure on the superconductivity of Ru0.95Rh0.05Sr2GdCu2O8.

  2. Pressure Effects in the Superconductivity of Pure and Rh-doped RuSr2GdCu2O8Milton S. Torikachvili, San Diego State Univ.,DMR-0306165 Education Three master degree students, and a visiting graduate student from France participated in this project. One student defended his thesis in 2006, and another will defend soon. Outreach The PI and students developed The Cool World of Cryogenics, a set of demonstrations and discussions based on the cooling properties of liquid nitrogen. We take this exhibit to high schools, to the Imperial Valley campus of SDSU, and to campus open-houses. This show brings out an enormous interest in science. High school students from the Imperial Valley community observing the levitation of a ring magnet above a liquid nitrogen cooled superconductor.

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