Abstract
It was found that the Mn3.69Bi95.69Fe0.62 consists of two phases, namely of a bismuth matrix and BiMn inclusions. It is shown that the samples have a crystalline texture. Independently on the applied field orientation, maximum on the temperature dependence of magnetization is detected at Tmax ≈ 85 K, which is associated with the reorientation transition of the magnetic moments of Mn for αBiMn phase. In turn, the electrical resistivity ρ(T) also demonstrates maximum at Tmax ≈58 K in a magnetic field of 800 kA/m when H⊥I. It is established that the maximum of ρ(T) increases and is shifted toward higher temperature Tmax≈94 K when field increasing up to 2400 kA/m. At the same time no clear maximum on ρ(T) is observed for H||I. It is shown that the relative magnetoresistance, Δρ/ρ0, is increased both with decreasing temperature and with increase of the magnetic field. The measured enhancement reaches Δρ/ρ0≈250% for H||I and Δρ/ρ0≈2400% for H⊥I in magnetic field of 2400 kA/m. Thus, the strong anisotropy of ρ(T) and Δρ/ρ0(T) is established both for H⊥I and H||I. Possible explanation of observed anomalous behavior of the temperature dependences of the electrical resistivity in magnetic fields has been proposed.
Highlights
On the applied field orientation, maximum on the temperature dependence of magnetization is detected at Tmax ≈ 85 K, which is associated with the reorientation transition of the magnetic moments of Mn for αBiMn phase
This paper presents results of investigation of the temperature dependences of the electrical resistivity and the magnetization of Mn3.69Bi95.69Fe0.62 in various magnetic fields
The revealed maximum at Tmax ≈ 85 K on the temperature dependences of the magnetization is associated with the reorientation transition of the magnetic moments of Mn which occurs in the αBiMn phase and disappears in fields above 2400 kA/m. 3
Summary
On the applied field orientation, maximum on the temperature dependence of magnetization is detected at Tmax ≈ 85 K, which is associated with the reorientation transition of the magnetic moments of Mn for αBiMn phase. The electrical resistivity ρ(Τ) demonstrates maximum at Tmax ≈ 58 K in a magnetic field of 800 kA/m when H ⊥ I. It is established that the maximum of ρ(Τ) increases and is shifted toward higher temperature Tmax ≈ 94 K when field increasing up to 2400 kA/m. Possible explanation of observed anomalous behavior of the temperature dependences of the electrical resistivity in magnetic fields has been proposed. На температурной зависимости намагниченности обнаружен максимум при Tmax ≈ 85 K, который не зависит от ориентации приложенного поля и связан с переориентационным переходом магнитных моментов Mn в фазе αBiMn. В свою очередь, электросопротивление также демонстрирует максимум при Tmax ≈ 58 K в магнитном поле 800 кА/м, когда H ⊥ I. КЛЮЧЕВЫЕ СЛОВА: огромное анизотропное магнитосопротивление, переориентационный переход, электронная и дырочная поверхности Ферми, MnBi сплавы, кристаллическая текстура, висмут
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