Topic
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 article, the transition from the para-to ferro-magnetic phase, accompanied by a transition to the mixed-valent state within a two-narrow-band model, is studied.
1 citations
Journal Article•
TL;DR: In this article, the authors investigate the magnetic and thermodynamic properties of systems where the magnetic field tunes through such a peak in the electronic density of states, and they show that this apparent non-Fermi liquid behaviour can be caused at mean-field level by the van Hove singularity.
Abstract: Theoretical studies of the metamagnetism and anomalous phase of Sr3Ru2O7 have focused on the role of van Hove singularities, although much experimental evidence points towards quantum criticality having a large effect. We investigate the magnetic and thermodynamic properties of systems where the magnetic field tunes through such a peak in the electronic density of states. We study the generic case of a van Hove singularity in 2D. We see that in combination with the requirements of number conservation and interaction effects the peak in the density of states produces several interesting phenomena including raising the critical field of the transition above naive estimates, altering the relationship between the temperature and field scales and creating a distinctive double-peak structure in the electronic specific heat. We show that this apparent non-Fermi liquid behaviour can be caused at mean-field level by a peak in the density of states.
1 citations
TL;DR: The obtained critical exponents β, γ and δ of TlCo2S2 could basically satisfy the scaling equations and are found very close to the prediction of the tricritical mean-field theory.
Abstract: We have investigated the critical behavior near the ferromagnetic transition of TlCo2S2 single crystals and the magnetic properties of Tl(Co0.95Ni0.05)2S2 by means of magnetization measurements. The obtained critical exponents β, γ and δ of TlCo2S2 could basically satisfy the scaling equations and are found very close to the prediction of the tricritical mean-field theory. 5[Formula: see text] Ni doping drives the system to an antiferromagnetic ground state which is unstable to magnetic field, yielding metamagnetic transition. The possible existence of a tricritical point (TCP) in Tl(Co0.95Ni0.05)2S2 is also discussed.
1 citations
TL;DR: In this article, a minimal model for metamagnetism based on a quantum spin Hamiltonian with a single energy scale was proposed, where the critical field is proportional to the temperature.
Abstract: We describe a minimal model for metamagnetism, based on a quantum spin Hamiltonian with a single energy scale. Within this model, the metamagnetic critical field is proportional to the temperature ...
1 citations
TL;DR: In this article, the properties of pseudo-binary Nd7Ni2Pd compound were studied using temperature-dependent x-ray powder diffraction and physical properties measurements, showing that the compound becomes ferromagnetic in fields of 8 kOe and higher with TC = 30 K.
Abstract: Crystallographic, magnetic, electrical transport and thermodynamic properties of pseudo-binary Nd7Ni2Pd compound have been studied using temperature-dependent x-ray powder diffraction and physical property measurements. Compared to the ferromagnetic parent Nd7Pd3, the ground state of Nd7Ni2Pd is antiferromagnetic, and it exhibits strong metamagnetism. The measurements indicate two antiferromagnetic transitions in fields less than 8 kOe: a second-order paramagnetic to antiferromagnetic at TN2 = 29 K and a weak first-order antiferromagnetic to antiferromagnetic transition at TN1 = 24.5 K. The compound becomes ferromagnetic in fields of 8 kOe and higher with TC = 30 K. Temperature dependence of lattice parameters is anomalous, most prominently in the basal plane at ∼30 K; however, there is no detectable structural distortion or clear volume discontinuity around 25 K, suggesting a significant weakening of the first-order transition when compared to the binary Nd7Pd3.
1 citations