scispace - formally typeset
Search or ask a question

Showing papers on "Metamagnetism published in 1975"


Journal ArticleDOI
TL;DR: In this article, the Stoner theory is used to relate the behaviour of B to the existence of a maximum in the susceptibility of YCo2 as a function of temperature, where the applied field is the molecular field due to Gd moments and the magnetization of GdxY1-xCo2 is discussed from this point of view.
Abstract: Some magnetic properties of ACo2 compounds, where A is a heavy rare earth metal, are shown to be related to properties of YCo2 In particular the existence of first order transitions for A=Er, Ho, Dy, but second order transitions for A=Tb, Gd, implies a special temperature dependence of the Landau parameter B which appears in the expansion of the free energy of YCo2 in powers of the magnetization B changes from negative to positive with increasing temperature and this is verified experimentally by measurements of the field dependence of the susceptibility of YCo2 at 42, 77 and 300K in field up to 150 kOe It is estimated that an applied field of about 1400 kOe would be required to produce itinerant electron metamagnetism in YCo2 and the magnetization of GdxY1-xCo2, where the 'applied' field is the molecular field due to Gd moments, is discussed from this point of view Stoner theory is used to relate the behaviour of B to the existence of a maximum in the susceptibility of YCo2 as a function of temperature

244 citations


Journal ArticleDOI
TL;DR: In this article, the authors verified the existence of a metamagnetic transition in manganous acetate tetrahydrate using proton resonance, which had been previously proposed to explain low field magnetization data.
Abstract: Using proton resonance we have verified the existence of a metamagnetic transition in manganous acetate tetrahydrate which had been previously proposed to explain low field magnetization data. The transition was found to occur when a field of 6 Oe was applied along the a axis. The observation of the transition was facilitated by the existence of one narrow line in the proton resonance spectrum which appears to originate from one of the acetate groups. Fields greater than 6 Oe along the a axis produce a mixed antiferromagnetic and saturated paramagnetic state which gradually turns into a pure saturated paramagnetic state as the field is increased. Two‐dimensional magnetic ordering appears to exist above the Neel temperature.

10 citations



Journal ArticleDOI
TL;DR: In this article, the authors verified the existence of a metamagnetic transition in manganous acetate tetrahydrate using proton resonance, which had been previously proposed to explain low field magnetization data.
Abstract: Using proton resonance we have verified the existence of a metamagnetic transition in manganous acetate tetrahydrate which had been previously proposed to explain low field magnetization data. The transition was found to occur when a field of 6 Oe was applied along the a axis. The observation of the transition was facilitated by the existence of one narrow line in the proton resonance spectrum which appears to originate from one of the acetate groups. Fields greater than 6 Oe along the a axis produce a mixed antiferromagnetic and saturated paramagnetic state which gradually turns into a pure saturated paramagnetic state as the field is increased. Two‐dimensional magnetic ordering appears to exist above the Neel temperature.