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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01 Jan 2010
TL;DR: The B-T magnetic phase diagrams for TbCu2Si2 single crystal, having the tetragonal ThCr 2Si2-type crystal structure, have been constructed from magnetic measurements as discussed by the authors.
Abstract: The B-T magnetic phase diagrams for TbCu2Si2 single crystal, having the tetragonal ThCr2Si2-type crystal structure, have been constructed from magnetic measurements. The compound orders antiferromagneticaly below TN=11.9 K and shows another magnetic transition at Tt=9.1 K. In the easy magnetization direction of [110], a six-step metamagnetic process appears at low temperatures. Above Tt, it becomes a two-step metamagnetic one. There are seven ordered magnetic phases below the paramagnetic region in the B110-T magnetic phase diagram. In the [100] magnetization process, three metamagnetic transitions appear at low temperatures. The magnetization process becomes a one-step one above Tt. The B100-T phase diagram, composed of four phases, is very peculiar; a quad-critical point may appear. The magnetic structure for each phase has been discussed.
1 citations
TL;DR: In this article, the effect of linearly polarized light illumination on the metamagnetic phase transition in the antiferromagnetic garnet Ca3Mn2Ga3O12 was studied.
Abstract: The effect of linearly polarized light illumination on the metamagnetic phase transition in the antiferromagnetic garnet Ca3Mn2Ga3O12 is studied. The crystal is exposed to light propagating both along the tetragonal axis [001] and along the [100] direction. In both cases, a change of the field Ht of the metamagnetic phase transition is observed under illumination, and this change depends on the orientation of plane or polarization of the light with respect to the crystal axes. In the first case, k‖H‖[001], the value of Ht decreases on exposure to light with the polarization E‖[110] and increases on exposure to light with the polarization E‖[110]. In the second case, k‖H‖[100], the value of Ht decreases irrespective of the orientation of the plane of polarization of the light with respect to the crystal axes. However, the magnitudes of the change of Ht are different for light with the polarization E‖[011] and with the polarization E‖[011]. The change of the field of the metamagnetic phase transition in t...
1 citations
TL;DR: In this article, the authors summarize recent theoretical results concerning strongly correlated fermion systems at nonzero temperature within a mean-field picture and introduce an interobital pairing mediated by a Kondo-type interaction.
Abstract: We summarize recent theoretical results concerning strongly correlated fermion system at nonzero temperature within a mean-field picture. In case of narrow-band systems (Part 1) we describe the Mott-Hubbard (localization) boundary, the presence of the T3 ln T term in the specific heat in almost localized systems, as well as the metamagnetism and spin-split heavy masses. We also mention the concept of a statistical spin liquid state and the stability of an extended s-wave superconducting state in two dimensions for this case. In Part 2 (hybridized systems) we introduce an interobital pairing mediated by a Kondo-type interaction and propose an universal scaling of superconducting properties for heavy fermion systems.
1 citations
TL;DR: In this paper, the influence of quantum critical point (QCP) of first-order valence transition (FOVT) on heavy fermions is discussed as a key origin of anomalies such as non-Fermi liquid, metamagnetism, and unconventional superconductivity.
Abstract: Influence of quantum critical point (QCP) of first-order valence transition (FOVT) on Ce- and Yb-based heavy fermions is discussed as a key origin of anomalies such as non-Fermi liquid, metamagnetism, and unconventional superconductivity. Even in intermediate-valence materials, the QCP of the FOVT is shown to be induced by applying a magnetic field, which creates a new characteristic energy distinct from the Kondo temperature. It is stressed that the key concept is closeness to the QCP of the FOVT by pointing out that the proximity of the QCP explains sharp contrast between X=Ag and X=Cd in YbXCu4, field-induced valence crossover in X=Au, and field-induced first order transition as well as non-Fermi-liquid critical behaviours in CeIrIn5. The valence fluctuations can be a key origin of unresolved phenomena in this family of materials.
1 citations
TL;DR: In this paper, high-field magnetization measurements up to 38 T have been performed on a newly grown single-crystalline Ho/sub 2/Co/sub 17/ sample along the main crystallographic directions of the hexagonal cell.
Abstract: High-field magnetization measurements up to 38 T have been performed on a-newly-grown single-crystalline Ho/sub 2/Co/sub 17/ sample along the main crystallographic directions of the hexagonal cell. The magnetization curve along the easy direction (b-axis) exhibits a metamagnetic-like transition at 23.6 T whereas for the a-axis a similar transition occurs at 32.4 T. The transitions are extremely sharp-much sharper than in previously grown crystals. The transitions are understood as a moment-flip transition associated with the formation of a noncollinear magnetic structure in this ferrimagnetic compound. From the transition-field value the 3d-4f spin-exchange parameter has been derived. Magnetization under pressure up to 5 kbar has been used to determine the pressure dependence of the magnetic transition at 23.6T. The pressure dependence dB/sub tr//dP amounts to -24 TMbar/sup -1/. >
1 citations