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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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Journal ArticleDOI
TL;DR: In this paper, a non-collinear antiferromagnetic model with the Pr moments of ∼ 2μ B directed to the 〈111〉-axes was proposed.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis and magnetic properties of [M(Cp*)2][Ni(tds)2], M = Fe, and Cr: tds = bis(trifluoromethyl)ethylenediselenato, are reported.
Abstract: The synthesis and magnetic properties of [M(Cp*)2][Ni(tds)2], M = Fe. Mn and Cr: tds = bis(trifluoromethyl)ethylenediselenato, are reported. The crystal structure for these compounds consists of an array of parallel stacks of alternating cations, [M(Cp*)2]±, and anions, [Ni(tds)2]−, ··D±A−D±A−D±A−··. For [Fe(Cp*)2][Ni(tds)2] and [Mn(Cp*)2][Ni(tds)2] the magnetic behavior is dominated by FM interactions, with Θ values of 10.6 and 24.6 K respectively, while for [Cr(Cp*)2][Ni(tds)2] the magnetic behavior is dominated by AFM interactions, with Θ = −86.4 K. [Mn(Cp*)2][Ni(tds)2], at low temperatures, shows a metamagnetic behavior. with TN = 2.1 K and HC = 60 G.

10 citations

Journal ArticleDOI
TL;DR: In this article, the magnetic properties, magnetoresistance, and electronic structure of the cubic phase (structure-type AuBe5, space group F-43m) of melt-spun DyCu5 have been investigated.
Abstract: The magnetic properties, magnetoresistance (MR), and electronic structure of the cubic phase (structure-type AuBe5, space group F-43m) of melt-spun DyCu5 have been investigated. In ac-susceptibility and magnetization measurements it has been found that below a critical temperature Tm=7.5 K this phase is metamagnetic. αDyCu5 samples show a negative magnetoresistance ratio MR(H)=[R(H)−R(0)]/R(0) of about −27% at 10 K and 5 T. This effect has similar behavior in transverse and perpendicular current-field directions. The electronic structure of αDyCu5 was calculated by the ab initio self-consistent spin-polarized tight-binding linear muffin tin orbital method in the atomic sphere approximation for the experimental value of lattice parameter a=0.7027 nm. The Fermi-level EF is located at the minority 4f Dy band. The main contribution to the density of states at the EF comes from 4f states of Dy and 3d states of copper atoms in one of two nonequivalent positions in a crystallographic cell.

10 citations

Journal ArticleDOI
TL;DR: In this article, a weakly interacting Kondo model, including crystalline field splitting, was introduced, which is composed of a collection of SU(Nc) Kondo models and a RKKY interaction between the localized spins of the Ce ions.
Abstract: A metamagnetic-like transition has been reported by Haen et al./(1987) for the magnetization curve in CeRu2Si2 with a large anisotropy. The author introduces here a weakly interacting Kondo model, including crystalline field splitting, which is composed of a collection of SU(Nc) Kondo models and a RKKY interaction between the localized spins of the Ce ions. The author investigates to what extent the metamagnetic-like behaviour can appear on the basis of this simplified model. The model has the advantage that one can derive the effective single site SU(N) Kondo Hamiltonian with the use of the mean field approximation for the intersite coupling. Then, using the exact solution of the effective Hamiltonian, the author investigates the magnetization process of the ground state. With the set of appropriate crystalline field parameters determined from the analysis of the specific heat, he has obtained the metamagnetic-like transition at a reasonable magnetic field with the large anisotropy qualitatively in agreement with the experimental data of CeRu2Si2. However, to achieve this it was necessary to use a large Kondo temperature and a ferromagnetic RKKY interaction. These discrepancies may be traced back to the mean field approximation for the intersite correlations.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the magnetic properties and specific heat of mixed valence vanadium oxide (SV6O11) were investigated and four-circle x-ray structural analysis discovered a structural transition at a temperature range between room temperature and 353 K.
Abstract: Magnetic property and specific heat of mixed valence vanadium oxide SrV6O11 were investigated. Single crystals and polycrystals were synthesized with a solid state reaction. Four-circle x-ray structural analysis discovered a structural transition at a temperature range between room temperature and 353 K. This transition corresponds to that of NaV6O11 at 245 K. Specific heat measurement of SrV6O11 was performed between 20 and 150 K and two anomalies were observed at 42 and 73 K. These anomalies are consistent with the two peaks in the temperature dependence of magnetization. Below 42 K, SrV6O11 shows metamagnetism and its critical field is about 4 T at 5 K. Its basic magnetic structure at 73 K is considered to be an antiferromagnetic state formed by the localized electron system.

9 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202320
202249
202117
202015
201937
201837