Metamagnetism

About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.

Metamagnetic transition in LuCo2 and its pseudo-binary compounds

Abstract: High field magnetizations up to 100 T, lattice constants and electronic specific heat coefficients have been measured for the Laves phase Lu(Co 1− x M x ) 2 (M = Ga, Sn and Si) compounds which exhibit itinerant electron metamagnetism for small x . The lattice constant increases with increasing x for M = Ga, or Sn, while it decreases linearly in the case of M = Si. The metamagnetic characteristics strongly depend on the substitutional element M. The critical field for the metamagnetic transition decreases with increasing x for M = Ga and Si, whereas it remains constant around 40 T above x = 0.06 for M = Sn. The magnetization jump due to the transition increases for M = Sn and rapidly decreases for M = Si. The different characteristics may result from the difference in the shape of the density of states modified by the substitutional element.

Antiferromagnetic ordering of divalent Eu in Eu3Ir4Sn13 intermetallic compound

Abstract: We report a systematic study of the electronic and magnetic properties of Eu3Ir4Sn13 intermetallic. Single crystals of Eu3Ir4Sn13 were synthesized using a Sn self-flux technique. X-rays powder diffraction shows that this compound crystallizes with the cubic Yb3Rh4Sn13-type structure, space group Pm-3n, which has 40 atoms per unit cell. The Eu ions were found to be divalent and order antiferromagnetically at T N = 11 K . An additional high-temperature anomaly at T * ∼ 50 K is observed in the electrical resistivity and heat capacity data, while it is not obviously present in the magnetic susceptibility. Within the ordered state, a metamagnetic transition is observed at T = 2 K and H m ≈ 2.7 T when magnetic field is applied along the [1 0 0] direction. The evolution of T N and T * was investigated by electrical resistivity under hydrostatic pressure conditions. We have also carried out electron spin resonance (ESR), and X-ray absorption near edge spectroscopy (XANES) measurements. The role of subtle Eu 2 + valence fluctuations and the magnetic correlations in the physical properties of this compound are discussed.

Multiferroicity in a spin-chain compound, Tb2BaCoO5, with exceptionally large magnetodielectric coupling in polycrystalline form

Abstract: We report the results of detailed investigations of magnetization, heat-capacity, dielectric, pyrocurrent, and magneto(di)electric measurements on Tb2BaCoO5, belonging to a hitherto unexplored spin-chain cobaltate family, R2BaCoO5 (R = Rare-earths). The magnetic measurements reveal that this compound exhibits an antiferromagnetic transition at (TN=) 18.8 K and there is a spin reorientation beyond 40 kOe below TN. Dielectric and pyrocurrent data measured as a function of temperature and magnetic field establish that this compound is a “type-II” multiferroic material. The most fascinating finding which we would like to emphasize is that the observed value of the magneto-dielectric effect beyond the metamagnetic transition field is the largest (close to 55%, below 10 K, for H = ∼100 kOe) ever reported for polycrystals of a compound in the bulk form, thereby offering a hope to find a single-phase polycrystalline compound at room temperature to enable ease of applications.

Magnetoresistivity and metamagnetism of the Nd33Fe50Al17 alloy

Abstract: A ternary phase has been identified in the rare-earth transition metal Nd–Fe–Al system This phase has a composition close to Nd5(Fe3Al)12 and is antiferromagnetic with a Neel temperature of approximately 260 K A clear step appears in magnetization curves of the isotropic ribbon at temperatures below 140 K, indicating metamagnetism Magnetoresistivity (MR) has been observed in this compound MR increases with decreasing temperature and is estimated to be 72% at 42 K This compound exhibits MR of 1% in the paramagnetic state at room temperature