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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, it was shown that the observed antiferromagnetic to ferromagnetic metamagnetic transition originates from cation-ordered PrBaMn2O6 nanoregions.
Abstract: Magnetization and resisitivity steps under application of a magnetic field are evidenced in absence of charge ordering at low temperature (T=2.5 K), in the manganite Pr0.5Ba0.5MnO3. Electron microscopy observations emphasize the important role of phase separation, suggesting that the observed antiferromagnetic to ferromagnetic metamagnetic transition originates from cation-ordered PrBaMn2O6 nanoregions.
23 citations
04 Apr 2005
TL;DR: In this article, the relation between magnetocaloric effects and Landau coefficients of itinerant electron metamagnetic La(Fe/sub x/Si/sub 1-x/)/sub 13/ (x = 0.87, 0.88) compounds is experimentally examined.
Abstract: The paramagnetic-ferromagnetic (P-F) transition, also known as itinerant electron metamagnetic transition, is accompanied by large magnetocaloric effects (MCEs) such as the isothermal entropy change and the adiabatic temperature. In this work, the relation between MCEs and Landau coefficients of itinerant electron metamagnetic La(Fe/sub x/Si/sub 1-x/)/sub 13/ (x = 0.87, 0.88) compounds is experimentally examined. Expressions describing the Helmholtz magnetic free energy, magnetic entropy and the equation of state H(M,T) are derived. The coefficients A(T), B(T) and C(T) are then experimentally determined from the magnetization curves by curve fitting of H(M,T), and are found to exhibit temperature dependence reflecting the thermal variation on the amplitude of spin fluctuations. The first-order P-F transition at Curie temperature appears in the region A(T) > 0, C(T) > 0, B(T) < 0 and 5/28 < A(T)C(T)B(T) < 3/16. From these Landau coefficients, the energy barrier between the F and P states and its influence in the demagnetisation process is calculated.
23 citations
TL;DR: In this article, a triple-layered perovskite (CuBr)Sr 2 Nb 3 O 10 with the S = 1/2 square lattice has been prepared through a chimie douce route.
Abstract: A new triple-layered perovskite (CuBr)Sr 2 Nb 3 O 10 with the S = 1/2 square lattice has been prepared through a chimie douce route. Presence of strong spin frustration is inferred from zero-field specific heat measurements which exhibit successive phase transitions at 9.3 and 7.5 K. Application of magnetic fields merges the transition temperatures at 3 T, suggesting that the intermediate phase is of magnetic origin with fluctuating spin–spin correlation. Despite the square geometry, magnetization curves have revealed a metamagnetic transition to a novel phase characterized by a 1/3 plateau of the saturated magnetization.
23 citations
TL;DR: In this paper, the metamagnetic behavior of orthorhombic single crystals NdCu 6 has been studied and it has been shown that magnetization curve in the field along the b-axis shows four steps, whereas that along the c-axis suggests a canted spin structure.
Abstract: We have found metamagnetic behavior of orthorhombic single crystals NdCu 6 . Magnetization curve in the field along the b -axis shows four steps, whereas that along the c -axis suggests a canted spin structure. These results suggest the existence of four canted sublattices.
23 citations
TL;DR: Magnetic properties of neptunium(V) oxalate, (NpO2)2C2O4·4H2O, were studied from 2.4 to 37.5°K with magnetic-susceptibility measurements using a vibrating-sample magnetometer at applied fields of 50−10 000 Oe; Mossbauer spectra of the 59.54−keV γ ray in 237Np were taken from 4.2 to 80°K.
Abstract: Magnetic properties of neptunium(V) oxalate, (NpO2)2C2O4·4H2O, were studied from 2.4 to 37.5°K with magnetic‐susceptibility measurements using a vibrating‐sample magnetometer at applied fields of 50–10 000 Oe; Mossbauer spectra of the 59.54−keV γ ray in 237Np were taken from 4.2 to 80°K. A metamagnetic transition was found at 11.6°K. Below 11.6°K the magnetization isotherms had the characteristic S shape of metamagnets. Below 8°K a pronounced hysteresis was observed as the field was reduced from saturation. At 3.15°K the remanent magnetization at 100 Oe was 96% of the saturation magnetization at 10 000 Oe, and 125 times greater than the magnetization in the low‐moment state. The Mossbauer spectra exhibited magnetic hyperfine splitting which was independent of temperature, with g0μnHeff = 10 cm/sec; splitting above the transition temperature is attributed to a long paramagnetic relaxation time.
23 citations