Metamagnetism

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

Nearly constant magnetic entropy change and adiabatic temperature change in PrGa compound

Abstract: The magnetic properties and magnetocaloric effect (MCE) of PrGa compound are studied in detail. Both thermomagnetization curves and heat capacity curves indicate that PrGa compound undergoes a transition from ferromagnetic (FM) to antiferromagnetic (AFM) phase at Tt ∼ 27 K and a transition from AFM to paramagnetic (PM) phase at T0 ∼ 37 K with increasing temperature. As the applied field increases, the magnetic state between Tt and T0 shows an obvious metamagnetic transition from AFM to FM state. The magnetic entropy change (ΔSM) calculated from magnetic property measurement and that obtained from heat capacity measurement are in good agreement with each other above 25 K. Instead of peak like distribution, nearly constant value of ΔSM in a temperature range from 29.5 K to 37.5 K is observed when the field change is 0–5 T. The adiabatic temperature change (ΔT) also shows similar change rules. This characteristic of MCE is very important for the practical applications of magnetic refrigerant materials.

Magnetic and Fermi Surface Properties in NpIn3

Abstract: We succeeded in growing a high-quality single crystal of NpIn 3 by the In-flux method, and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas–van Alphen (dHvA) effect. Ferromagnetic and antiferromagnetic orderings occur at T C =14 K and T N =10 K, respectively, together with another transition at T * =8 K. When the magnetic field is applied to the sample, the antiferromagnetic state is finally changed into a ferromagnetic state with two metamagnetic transitions. The antiferromagnetic ordering and two metamagnetic transitions are found to be of the first-order phase transition. In the dHvA experiments, we observed three dHvA branches with the cyclotron mass ranging from 3.4 to 14 m 0 . These dHvA branches are discussed from a viewpoint of the 5 f -localized model based on the Fermi surface of LaIn 3 .

Phase diagrams of the kinetic metamagnetic spin-3/2 Blume–Capel model in an oscillating external field

Abstract: Dynamic phase diagrams are calculated, within a mean-field approach, for the kinetic metamagnetic spin-3/2 Blume–Capel model in the presence of a time-dependent oscillating external magnetic field using Glauber-type stochastic dynamics and six fundamental types of phase diagrams are found in the reduced temperature (T) and magnetic-field amplitude parameter (h) plane The phase diagrams exhibit one, two or three dynamic tricritical points, and besides the paramagnetic (P), the antiferromagnetic-3/2 (AF3/2), the antiferromagnetic-1/2 (AF1/2) phases, three coexistence phase regions, namely AF3/2 + P, AF1/2 + P, AF3/2 + AF1/2, exist depending upon the interaction parameters The dynamic phase boundaries between the P and AF3/2 phases are always second-order lines, but between the P and AF1/2 phases are second- or/and first-order lines All other dynamic phase boundaries among the disordered, ordered phases and coexistence phase regions are first-order lines We have investigated the influence of the crystal field interaction (D) and we obtain five different phase diagram topologies in (d, T) plane, d = D /′ We have also studied the influence of the frequency on the phase boundaries as well as the dynamic tricritical point and found that the topologies of the phase diagrams slightly change (© 2007 WILEY-VCH Verlag GmbH & Co KGaA, Weinheim)