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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 paper, the phase diagrams of UPd 2 Al 3, URu 2 Si 2 and UPt 3 were determined and the metamagnetic transitions for these compounds were observed up to the characteristic temperatures showing the maxima of the magnetic susceptibilities.
Abstract: The high-field magnetization masurements in UPd 2 Al 3 , URu 2 Si 2 and UPt 3 were carried out up to 55 T at various temperatures. We determined their phase diagrams. The metamagnetic transitions for these compounds were observed up to the characteristic temperatures showing the maxima of the magnetic susceptibilities.
18 citations
TL;DR: In this article, a study of the pressure p, temperature T and magnetic field B phase diagram of ZrZn 2, the most promising material to exhibit ferromagnetic quantum criticality, is presented.
Abstract: We report a study of the pressure p, temperature T and magnetic field B phase diagram of ZrZn 2 , the most promising material to exhibit ferromagnetic quantum criticality. We find that the ordered ferromagnetic moment disappears discontinuously at p c = 16.5 kbar. Thus, a tricritical point separates a line of first-order ferromagnetic transitions from second-order (continuous) transitions at higher temperature. We also identify two lines of transitions of the magnetization isotherms up to 12 T in the p – T plane where the derivative of the magnetization changes rapidly.
18 citations
TL;DR: In this article, the properties of Gd1−xLaxMn2Ge2 intermetallic compounds with the ThCr2Si2-type layered structure were investigated and it was shown that the overall magnetism is controlled by the Mn-Mn intralayer distance in the tetragonal c-plane, reflecting the two-dimensional arrangement of Mn atoms.
Abstract: In this paper, we present our recent experimental results of magnetic and transport properties of Gd1−xLaxMn2Ge2 intermetallic compounds with the ThCr2Si2-type layered structure. The results obtained indicate that, in GdMn2Ge2, a first-order transition from a collinear antiferromagnetic to a collinear ferrimagnetic state appears with decreasing temperature at Tt3, below the Neel temperature TN. In Gd1−xLaxMn2Ge2 compounds with x=0.05 and 0.075, after ordering ferrimagnetically at Tt1, two kinds of first-order transitions from a canted ferrimagnetic to a non-collinear antiferromagnetic state and from a non-collinear antiferromagnetic to a reentrant canted ferrimagnetic state occur at Tt2 and Tt3. In Gd0.925La0.075Mn2Ge2, a field-induced metamagnetic transition from non-collinear antiferromagnetism to canted ferrimagnetism occurs at relatively low fields, accompanied by fractal like multi-step transitions, the so called “devil's stair-case”. Furthermore, a negative giant magnetoresistance (GMR) effect (Δρ/ρ∼15%) was observed at the field-induced metamagnetic transition. The mechanism of this negative GMR was clarified by comprehensive measurements of the resistivity on single crystals Gd0.925La0.075Mn2Ge2 and TbMn2Ge2. With further increasing x, only canted ferrimagnetism appears with a compensation temperature for 0.10 0.50. The phase diagram obtained indicates that the overall magnetism is controlled by the Mn–Mn intralayer distance in the tetragonal c-plane, reflecting the two-dimensional arrangement of Mn atoms.
17 citations
TL;DR: It is found that magnon excitation exists in AFM ordering and can be suppressed by an applied field, indicating that the AFM order appears destructive to SC, while FM can coexist with the superconductivity.
Abstract: In single crystals of Eu1 − xSrxFe2 − yCoyAs2, Co doping suppresses spin-density wave (SDW) ordering and induces a superconducting transition A resistivity reentrance due to the antiferromagnetic ordering of Eu2 + spins is observed, indicating the competition between antiferromagnetism (AFM) and superconductivity (SC) It is striking that the resistivity reentrance can be completely suppressed by a small magnetic field due to a field-induced metamagnetic transition from AFM to ferromagnetism (FM) The resistivity reentrance can also be suppressed by the substitution of Eu2 + ions with nonmagnetic Ba2 + /Sr2 + to completely destroy the AFM ordering These results indicate that the AFM order appears destructive to SC, while FM can coexist with the superconductivity Further we find that magnon excitation exists in AFM ordering and can be suppressed by an applied field Coexistence of SC from the FeAs layer and the inner field produced by the ferromagnetic Eu2 + layer suggest a possible p-wave component in the superconducting order parameter
17 citations
TL;DR: In this article, the effect of hydrostatic pressure (P) on ferromagnetic phase transition and magnetocaloric properties of (Sm0.8Nd0.2)0.52Sr0.48MnO3 single crystal was investigated.
Abstract: We have investigated the effect of hydrostatic pressure (P) on ferromagnetic (FM) phase transition and magnetocaloric properties of (Sm0.8Nd0.2)0.52Sr0.48MnO3 single crystal. At ambient pressure, the system undergoes a first order FM transition associated with large magnetic entropy change (ΔSM). The temperature distribution of ΔSM exhibits an asymmetric behavior with respect to TC. The application of pressure increases magnetization, shifts the FM transition to higher temperature, and weakens the metamagnetism. As a result, |ΔSM| decreases and its thermal distribution becomes more symmetric as compared to P=0.
17 citations