Neutron and synchrotron diffraction study of UPtGe

Electronic band-structure and X-ray photoemission spectra of ternaries APtGe (A=Th, U)

“…With respect to the popular orthorhombic TiNiSitype (Pnma), there is splitting of the uranium position into two positions. This results in two different values of moments at the two U sites yielding below T N = 50 K a unique, cycloid-type, magnetic arrangement, incommensurate with the crystal lattice [1]. At T N for the directions i||a and c axes an increase in the resistivity was observed [2], which can be connected with a change in the Brillouin zone and, as a consequence, the pseudogap opens in the conduction-electron band along these two directions.…”

“…UPtGe occupies an extremely unique position in both the crystal and magnetic structures [1,2] among the UTGe series. Its orthorhombic crystal structure of the EuAuGe-type (Imm2) is very rare.…”

Utilisations de l'analyse de polarisation pour la détermination de structures magnétiques

“…Ces résultats sont caractéristiques d'une structure cycloïdale pratiquement mono-domaine dans laquelle le domaine peuplé est celui où τ −x [7].…”

Magnetoresistivity of single-crystal UPtGe

“…[5] indexed their UPtGe sample according to the orthorhombic TiNiSi-type crystal structure that was used prior to the work of Mannix et al [2]. It seems likely that this maximum can be ascribed to Brillouin zone boundary reformation following a reduction in the effective number of current carriers upon magnetic ordering.…”

“…eel temperature of T N ¼ 52 K [1]. Neutron and synchrotron diffraction measurements [2] have been applied to resolve for UPtGe the rare noncentrosymmetric, orthorhombic EuAuGe-type crystal structure, with two different uranium atom sites, while the magnetic structure was indicated as an incommensurate, noncollinear cycloid. There is a small in-plane magnetocrystalline anisotropy [1] for the uranium magnetic moments that are confined to the ac-plane, compared to a large out-of-plane anisotropy.…”