Competition of magnetocrystalline anisotropy of uranium layers and zigzag chains in UNi0.34Ge2 single crystals

Pikul, Adam P.; Szlawska, Maria; Ding, Xiaxin; Sznajd, Józef; Ohashi, Masashi; Kowalska, Dorota A.; Pasturel, Mathieu; Gofryk, Krzysztof

doi:10.1103/physrevmaterials.6.104408

Competition of magnetocrystalline anisotropy of uranium layers and zigzag chains in UNi 0.34 Ge2 single crystals

Journal Article · Fri Oct 14 00:00:00 EDT 2022 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.6.104408· OSTI ID:1923696

^[1]; ^[2]; ^[3]; ^[2]; Ohashi, Masashi ^[4]; ^[2]; ^[5]; ^[3]

Polish Academy of Sciences (PAS), Krakow (Poland); Idaho National Lab. (INL), Idaho Falls, ID (United States)
Polish Academy of Sciences (PAS), Krakow (Poland)
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Kanazawa Univ. (Japan)
Univ. of Rennes (France); Centre National de la Recherche Scientifique (CNRS) (France)

Structural and thermodynamic properties of single-crystalline UNi_1-xGe₂ with x = 0.66 have been investigated by measuring magnetization, specific heat, and thermal expansion over a wide range of temperatures and magnetic fields. The measurements revealed the emergence of a long-range antiferromagnetic ordering of uranium magnetic moments below the Néel temperature T_N = 45.5 (1) K and the existence of two easy axes in the studied compound, namely b and c, which correspond to the planes of the uranium zig-zag chains. A magnetic field applied along these two crystallographic directions induces in the system a first-order metamagnetic phase transition (from antiferromagnetic to field-polarized paramagnetism), and the width of the magnetic hysteresis associated with that transition reaches as much as 40 kOe at the lowest temperatures. A magnetic phase diagram developed from the experimental data showed that the metastable region associated with that magnetic hysteresis forms a funnel that narrows toward the N´eel point in a zero magnetic field. The four-layer Ising model has successfully predicted the colinear antiferromagnetic structure in UNi_0.34Ge₂ (known from earlier reports), its magnetic phase diagram, and temperature and field variations of its magnetization. Moreover, it suggests that the first-order phase transition extends down to zero magnetic field, although it is barely detectable in the experiments performed in low magnetic fields. According to this model, the second-order phase transition occurs in the compound only in zero field.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1923696

Report Number(s):: INL/JOU-22-67561-Rev000

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 10 Vol. 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Competition of magnetocrystalline anisotropy of uranium layers and zigzag chains in UNi 0.34 Ge2 single crystals

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