Uniaxial ferromagnetism of local uranium moments in hexagonal UBeGe


Uniaxial ferromagnetism of local uranium moments in hexagonal UBeGe

Gumeniuk, R.; Yaresko, A. N.; Schnelle, W.; Nicklas, M.; Kvashnina, K. O.; Hennig, C.; Grin, Y.; Leithe-Jasper, A.

The new intermetallic uranium beryllium germanide UBeGe and its thorium analogon ThBeGe crystallize with the hexagonal ZrBeSi type of structure. Studies of magnetic, thermal, and transport properties were performed on polycrystalline samples between 1.8 and 750K. UBeGe is a uniaxial ferromagnet and there are indications for two magnetic transitions at Tc(1) ≈ 160K and Tc(2) ≈ 150K. The high paramagnetic effective moment μeff ≈ 3 1μB, x-ray absorption near-edge spectroscopy (XANES, 17–300 K), as well as theoretical DFT calculations indicate localized U 5f2 states in UBeGe. ThBeGe is a diamagnetic metallic material with low density of states at the Fermi level.

Keywords: ThBeGe; PXRD; HEFD XANES; electrical resistivity

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Publ.-Id: 25152