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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 article, the authors show that the antiferromagnetic state below the critical field Hc∼2.8 T can be fully decoupled from the pseudo-metamagnetic crossover at Hm∼5.8T which occurs when the magnetization reaches a critical value.
Abstract: Thermoelectric power measurements on the heavy fermion antiferromagnet Ce(Ru0.92Rh0.08)2Si2 under magnetic field (H) show clearly that the antiferromagnetic state below the critical field Hc∼2.8 T can be fully decoupled from the pseudo-metamagnetic crossover at Hm∼5.8 T which occurs when the magnetization reaches a critical value. By contrast to the weak field variation of the Sommerfeld coefficient of the specific heat in the field window from Hc to Hm, two electronic singularities with opposite signs are detected in the thermoelectric power. The interplay between the magnetic instability and the topological change of the Fermi surface is discussed and we argue similarities to other field instabilities in various heavy fermion compounds.
4 citations
4 citations
TL;DR: In this paper, a simplified Landau theory of coupled magnetic and structural transitions was developed for Gd5(Si1−xGex)4 and used to analyze the thermodynamics and phase transitions of this material under the influence of magnetic fields and elastic strain fields.
Abstract: 100 nm coatings of Fe and of Al were found to alter the magnetic attributes, such as the initial susceptibility and metamagnetic transition field, of the giant magnetocaloric material Gd5(Ge,Si)4 and thereby increase the entropy change for a given applied magnetic field, relative to uncoated samples. The experimental data strongly suggest that these coatings confer a strain that propagates through the material and enhances the effect of the magnetic field in the metamagnetic phase transition range. A simplified Landau theory of coupled magnetic and structural transitions was developed for Gd5(Si1−xGex)4 and used to analyze the thermodynamics and phase transitions of this material under the influence of magnetic fields and elastic strain fields.
4 citations
TL;DR: The temperature dependence of the magnetic susceptibility along the principal magnetic axes of rubidium-dysprosium tungstate RbDy(WO4)2 is measured in the temperature interval 0.5-300 K as mentioned in this paper.
Abstract: The temperature dependence of the magnetic susceptibility along the principal magnetic axes of rubidium–dysprosium tungstate RbDy(WO4)2 is measured in the temperature interval 0.5–300 K. Strong anisotropy of the susceptibility is observed at all temperatures in that range. At TN=0.8 K the susceptibility along all three magnetic axes exhibits a sharp anomaly due to the phase transition to a magnetically ordered state. At 0.5 K the measured field dependence of the magnetization along all three axes demonstrates a metamagnetic orientational phase transition in the directions of the magnetic axes y and z. Another type of anomaly of the magnetic susceptibility is observed at temperatures of around 5, 8, and 50 K. Analysis shows that these anomalies correspond to structural phase transitions in this compound.
4 citations
TL;DR: In this paper, the existence of a non-magnetic Tb ion was suggested on a TbRu 2 Si 2 single crystal, which has a six-step metamagnetic process, down to 2.5 K.
Abstract: Neutron-diffraction measurements in magnetic fields up to 5 T have been performed on a TbRu 2 Si 2 single crystal, which has a six-step metamagnetic process, down to 2.5 K. The field-induced magnetic phases have the same propagation vector k = (0.23,0,0) as the antiferromagnetic phase at H = 0 with the higher harmonics depending on magnetic field. The existence of a non-magnetic Tb ion is suggested.
4 citations