Crystal structure and superconductivity of new ternary MTGe germanides (M = Ti,Zr,Hf and T = Ru,Os,Rh,Ir) |
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| Affiliation: | 1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland;2. Department of Chemistry, Moscow Lomonosov State University, Leninskie Gory, 119991 Moscow, Russia;1. Superconducting Materials Laboratory, Department of Materials Science and Engineering, Shibaura Institute of Technology 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan;2. Experimental Physics, Saarland University, Campus C 6 3, 66123 Saarbrücken, Germany |
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| Abstract: | ZrIrGe and HfIrGe crystallize in the TiNiSi-type structure and exhibit a superconducting transition at 2.75K and 4.98K respectively. TiIrGe and HfRhGe have two allotropic varieties and their superconducting properties are strongly influenced by their crystal structure. On the other hand no superconducting transition has been observed above 1.6K for TiTGe (T = Ru,Os,Rh), ZrTGe (T = Ru,Os) and HfTGe (T = Ru,Os) which adopt either the ordered Fe2P-type or the TiFeSi-type superstructure. This investigation shows clearly that the TiNiSi-type structure favors occurence of superconductivity in ternary germanides as previously found for ternary silicides. |
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