Showing papers on "Metamagnetism published in 1984"
TL;DR: In this article, a fixed spin-moment (FSM) method, which allows one to calculate the total energy as an explicit function of the magnetisation, is introduced.
Abstract: The cubic Laves phase of YCo2 is near a transition from a paramagnetic to a magnetically ordered state. Self-consistent energy-band calculations yield the total energy and the magnetic moment as functions of volume. The new fixed spin-moment (FSM) method, which allows one to calculate the total energy as an explicit function of the magnetisation, is introduced. At the theoretical equilibrium volume YCo2 is found to be a strongly enhanced Pauli paramagnet, but at a slightly larger lattice constant a metamagnetic transition seems possible. Its occurrence can be understood on the basis of a double minimum in the total energy obtained from the present FSM calculations, which lead to an estimated critical field of about 350 T. In the magnetic state the Y moment is coupled antiferromagnetically to the Co moment.
244 citations
TL;DR: In this paper, the local density of states at Ni and Y sites and the total number of states are calculated for the intermetallic compounds Y2Ni17, YNi5, Y 2Ni7 and YNi3 in the recursion method.
Abstract: The local density of states at Ni and Y sites and the total density of states are calculated for the intermetallic compounds Y2Ni17, YNi5, Y2Ni7 and YNi3 in the recursion method. It is shown that the occurrence of ferromagnetism in Y2Ni17, Y2Ni7 and YNi3 is due to a peak in the density of states near the Fermi level. The temperature dependence of the spin paramagnetic susceptibility is calculated and the results are compared with the observed ones. The metamagnetism in Y2Ni16 and some local magnetic properties on Ni and Y atoms are discussed.
61 citations
TL;DR: In this article, the tricritical properties of a metamagnetic model, namely the next-nearest neighbor Ising antiferromagnet, in two dimensions were investigated.
14 citations
TL;DR: In this paper, the first-order magnetic transition from ferromagnetic to paramagnetism (FM-PM) usually observed in sufficiently strong fields was resolved into two sequential transitions in weak fields (H ⩽ 600 Oe): 1) from the PM state to the intermediate metamagnetic phase and 2) transition to the low-temperature magnetic phase.
13 citations
TL;DR: In this paper, the magnetic properties of NiMn alloys at finite temperatures are investigated on the basis of an improved theory of the local environment effect (LEE), and two self-consistent solutions, corresponding to the high magnetization state and the low magnetization states, are found for a certain intermediate region of atomic order in Ni3Mn.
11 citations
TL;DR: In this paper, a non-collinear antiferromagnetic model with the Pr moments of ∼ 2μ B directed to the 〈111〉-axes was proposed.
10 citations
TL;DR: Magnetic properties of polycrystalline samples of RPd2Si compounds (R = Gd, Tb, Dy, HoandEr) are presented in this paper, where a metamagnetic transition between two different antiferromagnetic phases is observed at 8.5 K.
9 citations
TL;DR: The bulk magnetic properties of the series of polycrystalline compounds RAgGa (where R is Pr, Nd, Gd, Tb, Dy, Ho, Er, or Tm) have been determined in applied fields up to 26 kOe and temperatures from 3 to 300 K as mentioned in this paper.
Abstract: The bulk magnetic characteristics of the series of polycrystalline compounds RAgGa (where R is Pr, Nd, Gd, Tb, Dy, Ho, Er, or Tm) have been determined in applied fields up to 26 kOe and temperatures from 3 to 300 K. These compounds form with the body‐centered orthorhombic crystal structure of the CeCu2 type. At high temperatures their reciprocal susceptibilities follow Curie–Weiss type behavior; their effective paramagnetic moments are in reasonable agreement with those calculated for the appropriate tripositive rare‐earth ion; their asymptotic Curie temperatures are all relatively small and positive. At low temperatures, the Gd, Ho, and Er compounds order ferromagnetically; the Tb compound orders antiferromagnetically; the Dy compound is metamagnetic; the Pr and Tm compounds almost order ferromagnetically at the lowest measured temperature.
7 citations
TL;DR: The magnetization in the tetragonal c-plane was measured using a single crystal of bct ErRh4B4 as mentioned in this paper, and the magnetization decreases with increasing magnetic field in a field range just below the metamagnetic transition.
6 citations
TL;DR: In this article, a domain wall activation model is employed to obtain the parameters H0(0), 30kOe, VV(0)=0.24K−1, and β=0.016K− 1, where H0 is the coercive force at absolute zero, VT(0) the domain wall activations parameter, andβ the coefficient for the linear temperature dependence of the reduced anisotropy.
3 citations
TL;DR: In this paper, the magnetic phase diagram of the quasi one-dimensional compound N(CH3)4NiCl3 (TMNC) was presented and a field-induced phase transition was found at approximately 125 Oe, which is interpreted as a metamagnetic one.
Abstract: In this paper we present the magnetic phase diagram of the quasi one-dimensional compound N(CH3)4NiCl3 (TMNC). For fields applied within the easy plane, a field-induced phase transition is found at approximately 125 Oe, which is interpreted as a metamagnetic one. The transition field is nearly independent of the orientation of H within the easy plane. This is explained in terms of a three-domain model. A rather large orthorhombic anisotropy is observed (E = 0.75 K), while the interchain interaction is found to be an order of magnitude smaller than is usually assumed ( |zJ′ k | = 0.01 K) .
Journal Article•
TL;DR: In this article, the thermodynamic properties of a modele d'Ising with quatre sous-reseaux de spins were investigated. André et al. showed that les termes de cette interaction ne sont pas des fonctions impaires des operateurs des sous reseaux of spins.
Abstract: Etude d'un modele d'Ising a deux sous-reseaux avec interactions a quatre spins. On suppose que les termes de cette interaction ne sont pas des fonctions impaires des operateurs des sous-reseaux de spins. Etude des proprietes thermodynamiques du modele au moyen d'une approximation incluant les fluctuations gaussiennes du champ moleculaire. Les resultats sont en accord avec les donnees experimentales sur Mn 3 GaC