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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: The spin-dependent effective masses (m * = m σ * ) in the de Haas-van Alphen measurements for CePd2Si2, CeRu2Si 2, and CeCoIn5 confirmed our earlier prediction and provided a good test for the mean field theory of correlated electrons in narrow-band systems.
Abstract: The recent discovery of spin-dependent effective masses ( m * = m σ * ) in the de Haas–van Alphen measurements for CePd2Si2, CeRu2Si2, and CeCoIn5 confirmed our earlier prediction and provides a good test for the mean-field theory of correlated electrons in narrow-band systems. This effect is particularly strong for almost localized systems near the metamagnetic transition, where the quantum electron liquid splits into two components with m ↑ * m ↓ * . We overview the phenomenon, which appears naturally for both the Mott–Hubbard and the Anderson–Kondo lattice metallic systems; in the former for non-half-filled cases, whereas in the latter when the valency of either Ce atoms deviates slightly from the integers valence. We also address the question of quantum critical behavior at the localization–delocalization transition in both the systems.
15 citations
TL;DR: In this article, the authors used the McConnell I model to analyze the intermolecular magnetic coupling in the charge transfer (CT) salts and showed that the predicted ferromagnetic (FM) intrachain coupling and the antiferromagnetic coupling in interchain coupling (both intra and interlayer) are in good agreement with the experimental results.
Abstract: The family of charge-transfer (CT) salts [M(Cp*)2][Ni(α-tpdt)2] [α-tpdt = 2,3-thiophenedithiolate; M = Fe (1), Mn (2), Cr (3)] were prepared. The crystal structure of 3 is similar to that previously reported for 1 and is composed of alternatinglayers each consisting of parallel mixed donor–acceptorD+A–D+A–D+A– chains, and the chains in adjacent layers are perpendicular. A similar crystal structure is expected to occur in 2. The McConnell I model was used to analyze the intermolecular magnetic coupling in this family of compounds. The predicted ferromagnetic (FM) intrachain coupling and the antiferromagnetic (AFM) coupling in the interchain coupling (both intra and interlayer) are in good agreement with the experimental results. The magnetic behavior of these compounds is dominated by FM interactions, which are ascribed to the intrachain FM DA interactions. The low-temperature magnetic behavior of the new CT salts contrasts that previously reported for metamagnetic compound 1. Whereas CT salt 3 remains paramagnetic down to 1.6 K, 2 shows magnetic behavior that is typical of a frustrated magnet and has a blocking temperature of ca. 4 K. For this compound, the magnetic frustration results from a degenerate ground state in the interlayer spin arrangements. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
15 citations
TL;DR: In this article, the authors show that the metamagnetic transition in the Fermi surface bifurcates into two transitions as the field is rotated away from the conducting planes.
Abstract: We show that the metamagnetic transition in ${\mathrm{Sr}}_{4}{\mathrm{Ru}}_{3}{\mathrm{O}}_{10}$ bifurcates into two transitions as the field is rotated away from the conducting planes. This two-step process comprises partial or total alignment of moments in ferromagnetic bands followed by an itinerant metamagnetic transition whose critical field increases with rotation. Evidence for itinerant metamagnetism is provided by the Shubnikov--de Haas effect, which shows a nontrivial evolution of the geometry of the Fermi surface and an enhancement of the quasiparticles effective mass across the transition. We conclude that the metamagnetic response of ${\mathrm{Sr}}_{4}{\mathrm{Ru}}_{3}{\mathrm{O}}_{10}$ is orbital dependent and involves both ferromagnetic and metamagnetic bands.
15 citations
TL;DR: The orthorhombic Tb(Ni, Cu) 2 and Gd(Ni and Cu 2 ) 2 systems are similar according to electrical resistivity and magnetic results as discussed by the authors.
14 citations
TL;DR: In this paper, a step-like metamagnetic transition in the magnetization with a critical field of 3.3 T was observed for half-doped manganite.
Abstract: We have performed transport, magnetization and specific heat measurements on the ABO3-type half-doped (La0.3Eu0.2)(Ca0.3Sr0.2)MnO3 (LECSMO) manganite. At T = 2 K, a sharp step-like metamagnetic transition in the magnetization with a critical field of 3.3 T is observed. The transition is much sharper than that seen at higher temperatures ( K). Such step-like transitions have previously been reported only in Pr-based manganites, but the present data show that the step-like metamagnetism can also be found in other manganite compounds.
14 citations