Magnetic structures determination of ternary uranium germanides with U-zigzag chains: thermal and magnetic field dependence studies
The U-zigzag chains encountered in the crystal structure of the uranium germanides UGe2, URhGe and UCoGe play a fundamental role on the coexistence of superconductivity and ferromagnetism in these very fascinating materials. Recently, we have discovered novel compounds characterized by such chains within two families, namely UT1-xGe2 and U3T'Ge5 (T and T' = transition metals), and presenting many crystallographic, magnetic and electrical similarities with the superconducting ferromagnets. Solving the magnetic structures of these intermetallics will help to understand the influence of the U-zigzag chains (U-U distances and angles) on their physical properties. Indeed, neutron diffraction experiments, including field dependence measurements, will help us in determining the origin of (i) the gapping of the Fermi surface of the ferromagnets U3TiGe5, U3ZrGe5, UFe0.40Ge2 and UCo0.45Ge2 (non-fully aligned moments vs. spin density wave), and (ii) the transition from ferromagnetism to antiferromagnetism to spin fluctuation when T' varies from column 4 to column 6 in U3T'Ge5 (with T' = Ti, Zr, V, Nb, Cr).
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PASTUREL Mathieu; FRYARS Stephanie; GUY Graziella; LEMOINE Pierric; NASSIF Vivian and Carmelo Prestipino. (2021). Magnetic structures determination of ternary uranium germanides with U-zigzag chains: thermal and magnetic field dependence studies. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2839
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