Showing papers on "Metamagnetism published in 1969"
07 Oct 1969
TL;DR: In this paper, magnetization isotherms have been measured for single crystal Ni(NO3)22H2O between 14 degrees and 42 degrees K with fields up to 16 k Oe applied along the a-axis.
Abstract: : Magnetization isotherms have been measured for single crystal Ni(NO3)22H2O between 14 degrees and 42 degrees K with fields up to 16 k Oe applied along the a-axis These isotherms exhibit the metamagnetic threshold phenomenon anticipated on the basis of earlier zero-field susceptibility measurements The locus of the metamagnetic transition points in the H,T plane forms a smooth phase boundary separating antiferromagnetic and ferro- or paramagnetic regions (Author)
32 citations
TL;DR: In this article, a crystal structure refinement of the compound Gd2CoMnO6 was performed and it was shown that the Mn3+-O2−-Mn3+ bond angles are ∼ 145° and that the distortion from cubic symmetry is considerable.
Abstract: The compound Gd2CoMnO6 crystallizes with the orthorhombic perovskite structure and is isomorphous with GdFeO3. A crystal structure refinement shows that the Mn3+-O2−-Mn3+ bond angles are ∼ 145° and that the distortion from cubic symmetry is considerable. A spontaneous moment of 5 e.m.u./g develops below 115°K due to the exchange interactions between near neighbouring Mn3+ ions. Below 115°K a field induced metamagnetic transition to a state with a moment of 20 e.m.u./g is also observed and this transition is depressed in temperature by 1°c for 360 oe applied field. The metamagnetism is accounted for on the basis of a transition between an uncompensated anti-ferromagnetic and a ferromagnetic state which is observed in Gd2CoMnO6 due to a change in sign of the Mn3+-O2−-Mn3+ exchange interaction originating from Jahn-Teller electronic ordering in Mn3+ ions. This ordering is favoured at low temperatures and introduces a negative contribution to the exchange interaction.
26 citations
TL;DR: Magnetization measurements on a powdered sample of UP075S025 show the occurrence of a metamagnetic state as mentioned in this paper, which is consistent with the results of the neutron diffraction study in which ferromagnetic and type-IA antiferromagnetic structures were found at temperatures respectively above and below that of the met amagnetic state.
Abstract: Magnetization measurements on a powdered sample of UP075S025 show the occurrence of a metamagnetic state. They agree with the results of the neutron diffraction study in which ferromagnetic and type-IA antiferromagnetic structures were found at temperatures respectively above and below that of the metamagnetic state.
7 citations