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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 authors measured the magnetization and specific heat below the antiferromagnetic (AF) transition temperature T N =10 K in the magnetic field along [100] and [110] axis.
Abstract: To investigate the 4f magnetic state of Eu 3 Ir 4 Sn 13 , we have measured the magnetization and specific-heat below the antiferromagnetic (AF) transition temperature T N =10 K in the magnetic field along [100] and [110] axis. The magnetic entropy approaching R ln 8 indicates 2+ valence of Eu ion at low temperatures. The existence of antiferromagnetic short-range interaction above T N is inferred from suppressed magnetic entropy at T N . The observed nuclear specific heat is mainly attributable to Eu nucleus. The electronic specific heat coefficient γ decreases continuously with increasing field, while the magnetic specific heat is enhanced around the metamagnetic transition field of B M =2.8 T for B //[100].
7 citations
TL;DR: In this article, the critical temperature of the quantum anisotropic spin-1 2 Heisenberg antiferromagnetic model in the presence of a magnetic field is studied by mean field approximation.
7 citations
TL;DR: In this paper, the phonon energies in cobaltite/manganites A(Co 1/2Mn1/2)O3, where A is a lanthanide, were determined by far-infrared spectroscopy.
7 citations
01 Jan 2006
TL;DR: The first-order transition between a nonmagnetic state and a ferromagnetic state is called the itinerant-electron metamagnetic transition (IEMT), which is in contrast to the transition in localized electron magnets which are antiferromagnetic or hilimagnetic in the grand state.
Abstract: There are many materials which exhibit the first-order transition caused by changing external parameters such as magnetic field, pressure and temperature as well as internal parameters such as exchange field and composition. The first-order transition, which takes place between a nonmagnetic state and a ferromagnetic state, is called the itinerant-electron metamagnetic transition (IEMT). This transition is in contrast to the transition in localized electron magnets which are antiferromagnetic or hilimagnetic in the grand state. This phenomenon is closely correlated to the magnetic instability and often observed in exchange-enhanced Pauli paramagnets. This magnetic instability causes not only the IEMT but also various striking properties such as enhanced magnetic susceptibility and its temperature maximum, large electronic specific heat coefficient, significant magnetovolume effects and so on. Therefore, the IEMT is interesting from not only fundamental but also practical viewpoints. Exchange-enhanced Pauli paramagnets, Laves-phase compounds such as YCo2 and LuCo2, have been investigated from both theoretical and experimental viewpoints. In these compounds, the IEMT is closely correlated with the peculiar band structure near the Fermi level and spin fluctuations. Thus far, the itinerant-electron metamagnetism has mainly been investigated from the viewpoint of basic researches. This chapter sheds light on the marked changes in magnetic properties caused by the itinerant-electron metamagnetic transition, intending practical applications.
7 citations
TL;DR: In this article, the magnetic phase transition of the itinerant-electron system Fe3(Ga1−xAlx)4, with x in the range 0.00⩽x ⩽0.10, is studied by means of magnetisation and resistivity measurements.
Abstract: The magnetic phase transitions of the itinerant-electron system Fe3(Ga1−xAlx)4, with x in the range 0.00⩽x⩽0.10, are studied by means of magnetisation and (magneto)resistivity measurements. At 65.5 K, with increasing temperature a first-order magnetic phase transition from a ferromagnetic to an antiferromagnetic state is observed for Fe3Ga4. Substitution of Al for Ga results in an increase of the transition temperature of 4.1(4) K/at% Al; the low-temperature ferromagnetic state is stabilised with respect to the high-temperature antiferromagnetic state. This behaviour is different to the effect of Co substitution on the Fe sites, where the magnetism is suppressed, eventually leading to paramagnetism. The results are discussed in the framework of the theory on magnetic phase transitions in itinerant-electron systems of Moriya and Usami.
7 citations