Structural,magnetic and electrical properties of some uranium ternary germanides: UM2Ge2 (M = Rh,Ir) and U4M7Ge6 (M = Ru,Os) |
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| Institution: | 1. Department of Physics, Al-Baha University, P.O. Box (1998), Saudi Arabia;2. Al-Nielean University, Sudan;1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P Nr 1410, 50-950 Wrocław, Poland;2. Department of Chemistry, Moscow Lomonosov State University, Leninskie Gory, 119991 Moscow, Russian Federation;3. Faculty of Pharmacy, Sechenov University, 2-4 Bolshaya Pirogovskaya st., 119991 Moscow, Russian Federation;1. National Physical Laboratory, Teddington TW11 OLW, United Kingdom;2. Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom;1. Department of Chemistry, Moscow State University, 119991 Moscow, Russia;2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland;1. Department of Earth System Sciences, Yonsei University, Seoul 03722, Republic of Korea;2. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA;3. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022, China;4. Department of Chemistry and Biochemistry & NanoCenter, University of South Carolina, Columbia, SC 29208, USA;5. College of Physics, Jilin University, Changchun 130012, China;6. Bragg Institute, Australian Science and Technology Organization, PMB 1, Menai, NSW 2234, Australia |
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| Abstract: | The crystal structures and the physical properties of U4M7Ge6 (M = Ru, Os) and UM2Ge2 (M = Rh, Ir) have been investigated. The former crystallize in the cubic structure of U4Re7Si6; U4Ru7Ge6 orders ferromagnetically at TC ≈ 10–13 K whereas U4Os7Ge6 remains paramagnetic down to 4.2 K. The latter whise structures derive from the tetragonal ThCr2Si2 or CaBe2Ge2 types display limited homogeneity ranges; URh2Ge2 exhibits a dense-Kondo behaviour at low temperatures; UIr2Ge2 shows polymorphism and its physical properties are strongly influenced by its crystal structure. |
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