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Metamagnetism
About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.
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TL;DR: In this article, the magnetic susceptibility for paramagnetic or ferromagnetic metals carrying itinerant electrons is evaluated as a function of temperature, and it is shown that for the paramagnetic regime, at low temperatures, the susceptibility definitely shows a maximum which is responsible for universal phenomena observed in 4d and 5d metals, Laves phase compounds and heavy-fermion compounds.
Abstract: On the basis of the Fermi-liquid model the magnetic susceptibility for paramagnetic or ferromagnetic metals carrying itinerant electrons is evaluated as a function of temperature. It is shown that for the paramagnetic regime, at low temperatures, the susceptibility definitely shows a maximum which is responsible for universal phenomena observed in 4d and 5d metals, Laves phase compounds and heavy-fermion compounds. The present model explains the concurrence of the susceptibility maximum and Curie-Weiss susceptibility in nearly ferromagnetic metals, the appearance of thermally induced ferromagnetism and the precise Curie-Weiss law for relatively weak ferromagnets. The Fermi-liquid effect produces logarithmic terms in the free energy with respect to temperature, magnetization M etc. Because of the M 4 In M term of the energy, some Laves phase compounds are shown to exhibit a metamagnetic transition. This term is also the origin of peculiar nonlinear magnetization curves observed for CeRu2Si2.
6 citations
TL;DR: It is found that the ferrimagnetic coupling, together with the strong tendency to heterocoordination is important for the persistence of magnetic ordering in the Y-rich regime.
Abstract: The magnetic properties of Co-Y crystalline intermetallic compounds and amorphous alloys have been investigated using molecular-dynamics simulations of the amorphous structure (based on effective tight-binding-bond forces) and self-consistent spin-polarized electronic-structure calculations (using the supercell approximation for the amorphous phases). We find that the amorphous structure is characterized by a rather strong chemical short-range order (stronger than in amorphous Fe-Y, but weaker than in Ni-Y allows). As a consequence, the total electronic density of states (DOS) is also similar in the crystalline and amorphous phases, apart from a smearing of the fine-structure characteristic for the long-range order in the intermetallic compounds. All crystalline ${\mathrm{Co}}_{\mathit{x}}$${\mathrm{Y}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ alloys with x\ensuremath{\ge}75 and all amorphous alloys with x\ensuremath{\ge}45 are ferrimagnetic. The Laves phase ${\mathrm{Co}}_{2}$Y shows metamagnetism. The disorder-induced smearing of the electronic DOS eliminates the metamagnetic instability and is responsible for the increase of the paramagnetic DOS at the Fermi level and for the enhancement of magnetism. We find that the ferrimagnetic coupling, together with the strong tendency to heterocoordination is important for the persistence of magnetic ordering in the Y-rich regime.
6 citations
TL;DR: In this paper, it was shown that UCuSn does not form in the hexagonal CaIn2 structure, but is an ordered ternary compound and forms in an orthorhombic structure (space group: P21cn).
Abstract: Crystallographic analysis shows that UCuSn does not form in the hexagonal CaIn2 structure as reported previously, but is an ordered ternary compound and forms in an orthorhombic structure (space group: P21cn). Bulk and neutron‐diffraction measurements reveal that UCuSn orders antiferromagnetically below 62 K. At 4.2 K, high‐field magnetization reveals a complex magnetization process with two metamagnetic transitions. Furthermore, bulk investigations show an additional anomaly at 25 K, but a smooth temperature dependence of various magnetic peaks down to the lowest temperature gives no evidence for a second magnetic transition. Possible scenarios responsible for the drastic changes in the electronic properties around 25 K are discussed.
6 citations
TL;DR: Magnetization was observed at 4.2 K up to 36 T and volume magnetostriction was obtained at4.2K up to 20 T for Y 1− x Gd x Co 2 (0≤ x ≤ 1).
6 citations
TL;DR: The La-excess alloys La1+δ(Fe0.85Si0.15)13 (δ = 0.06 and 0.09) exhibit large magnetocaloric effect which has been attributed to the occurrence of itinerant-electron metamagnetic transition near the Curie temperature TC.
Abstract: The La-excess alloys La1+δ(Fe0.85Si0.15)13 (δ = 0.06 and 0.09) exhibit large magnetocaloric effect which has been attributed to the occurrence of itinerant-electron metamagnetic transition near the Curie temperature TC. The maximum entropy change −ΔSm was shown to be from 4.5 to 11.5 J/kg K for the applied field variation ΔH from 20 to 70 kOe, respectively. The estimated relative cooling power for ΔH = 70 kOe was 418 J/kg. The alloys show a typical NaZn13-type cubic structure, featuring a doping-induced magnetovolume effect with the increase in TC. Under the applied pressure up to 2 GPa, the TC as deduced from resistance measurements decreased linearly, ΔTC = 113 (for δ = 0.06) and 111 K (for δ = 0.09), together with a corresponding decrease of resistivity, Δρ = 6.1 μΩ m at room temperature for both samples. At a low pressure, the effect of spontaneous magnetostriction on TC caused by applying the pressure appeared to have a similar magnitude to that of the negative magnetovolume effect caused by La-exces...
6 citations