Showing papers on "Metamagnetism published in 1986"
TL;DR: Magnetization measurements on the itinerant electron magnet Y(Co1−xAlx)2 up to 350 kOe have clearly revealed metamagnetic transitions in the paramagnetic region as discussed by the authors.
75 citations
TL;DR: In this paper, a new magnetic equation of state for liquid /sup 3/He is derived from a model for the polarization dependence of the Landau parameters, which is constrained by general thermodynamic relationships and microscopic symmetries.
Abstract: A new magnetic equation of state for liquid /sup 3/He is derived. This is obtained from a model for the polarization dependence of the Landau parameters. The parameters of the model are constrained by general thermodynamic relationships and microscopic symmetries. It is shown that the nonlinear field splitting of the A phase in liquid /sup 3/He is consistent with this model. We propose that liquid /sup 3/He can be viewed as nearly metamagnetic.
32 citations
TL;DR: Magnetization of Fe 3 Ga 4 is measured as a function of magnetic field and temperature in weak and strong magnetic fields as mentioned in this paper, which can be explained by the Moriya-Usami theory.
Abstract: Magnetization of Fe 3 Ga 4 is measured as a function of magnetic field and temperature In weak fields, Fe 3 Ga 4 is an antiferromagnetic with a Neel temperature of 392 K In strong fields, it shows a metamagnetic transition and gives a saturation moment of 127 µ B per Fe atom at 42 K and 70 kOe Its Mossbauer spectrum is analyzed into four sextets, assigned to the crystal site Fe(1), Fe(2), Fe(3) and fe(4): each site has, respectively, an internal field of 225, 190, 150 and 171 kOe at 80 K The magnetic phase diagram of Fe 3 Ga 4 involving the metamagnetism can be explained by the Moriya-Usami theory
26 citations
TL;DR: The superfluid phase shows a reentrant behavior with the transition temperature reaching a maximum of --14 mK at 25 bars and 35% polarization and an experimental procedure is proposed for reaching this region of the phase diagram.
Abstract: We have explored some of the consequences of the nearly metamagnetic model of liquid /sup 3/He due to Bedell and Sanchez-Castro. The most interesting result is for the superfluid transition. The superfluid phase shows a reentrant behavior with the transition temperature reaching a maximum of --14 mK at 25 bars and 35% polarization. We propose an experimental procedure for reaching this region of the phase diagram and discuss a number of experiments to explore the reentrant behavior.
24 citations
TL;DR: In this paper, the metamagnetic behavior of orthorhombic single crystals NdCu 6 has been studied and it has been shown that magnetization curve in the field along the b-axis shows four steps, whereas that along the c-axis suggests a canted spin structure.
Abstract: We have found metamagnetic behavior of orthorhombic single crystals NdCu 6 . Magnetization curve in the field along the b -axis shows four steps, whereas that along the c -axis suggests a canted spin structure. These results suggest the existence of four canted sublattices.
23 citations
TL;DR: The two-step jump in the magnetization for Hparallel(100) indicates that the magnetic structure belongs to the first-kind ordering in the antiferromagnetic fcc lattice, which can be explained by a four-sublattice model taking account of the fourfold magnetic anisotropy.
Abstract: Magnetization was measured on a single crystal of body-centered tetragonal ErRh/sub 4/B/sub 4/, an antiferromagnetic superconductor. It was found that the c axis is the strong hard-magnetization direction. A large fourfold magnetic anisotropy was observed in the tetragonal c plane. The (100) and (010) axes are the easy-magnetization directions and the (110) axis is the hard-magnetization one in the c plane. The magnetization curves below T/sub N/ show two-step jumps in both cases of Hparallel(100) and Hparallel(010) and show only one-step jumps in the case of Hparallel(110). Furthermore, it is shown that superconductivity coexists with intermediate magnetic states under a magnetic field in the c plane. The magnetization process in the c plane is understood as metamagnetism and can be explained by a four-sublattice model taking account of the fourfold magnetic anisotropy. Based on the fact that Er spins are approximately located on an fcc lattice in bct ErRh/sub 4/B/sub 4/, the type of the antiferromagnetic order is discussed. The two-step jump in the magnetization for Hparallel(100) indicates that the magnetic structure belongs to the first-kind ordering in the antiferromagnetic fcc lattice. The magnetization process below T/sub N/ is discussed, and the exchange constants between the magnetic spins are determined.more » The results obtained are consistent with the stability condition of the first-kind ordering.« less
16 citations
TL;DR: In this article, a linearized muffin-tin orbital (LMTO) method has been used to calculate the magnetic properties of UCo2 and UFe2 for the Laves phase systems.
Abstract: Electronic structure calculations within the linearized muffin-tin orbital (LMTO) method have been performed for the uranium-3d metal Laves phases. Calculated equilibrium volumes show very good agreement with experimental data. The spin-only magnetic properties of UFe2 were also considered and the calculated Fe spin moment agrees quite well with measurements. It is noteworthy that the uranium 5f spin moment is found to be antiparallel to the iron moment. The spin magnetism of UFe2 was also calculated as a function of pressure. The 3d spin moment is found to initially decrease by 1.5 μB/Mbar. Around 500 kbar the magnetism is calculated to disappear. For UCo2 a paramagnetic ground state was obtained, which, however, in agreement with data, is enhanced quite substantially. Finally, for UMn2 the Stoner criterion for magnetism was found to be just fulfilled. This is somewhat in disagreement with experiments where only enhanced magnetic properties have been reported. The possibility of metamagnetism in UMn2 is suggested. The bulk modulus for these Laves phase systems has been calculated. Total and partial densities-of-states are also reported.
14 citations
TL;DR: In this article, the authors demonstrate that during melting of polarized 3He, the mean measured magnetization is also that of the liquid at the interface, and use the results of a previous analysis to demonstrate a recently advanced hypothesis.
Abstract: Using the results of a previous analysis, we demonstrate a recently advanced hypothesis. Under some conditions which we state explicitly, during melting of polarized 3He, the mean measured magnetization is also that of the liquid at the interface. It allows us to use the data of a previous experiment to obtain the susceptibility of the liquid dm/dH vs. the field. The results suggest the existence of a metamagnetic transition, at round 40 Tesla.
13 citations
TL;DR: In this article, the magnetic and electrical properties of UIrSi3 are described, which is the only one of UTSi3 composition (T = transition metal), crystallizes with the BaNiSn3-type structure and orders antiferromagnetic below 42 K.
8 citations
TL;DR: In this article, the density of states for various non-cubic Y-Ni, Y-Co and Y-Fe compounds are calculated by the recursion method and the average and local magnetic moments, the high-field susceptibility and the temperature dependence of the spin susceptibility, etc.
6 citations
TL;DR: In this article, the magnetoresistance ρ(H,T0) of the magnetic Kondo lattice CeAl2 at temperatures T0 in the range 0.035 − 1.3 K, well below the Neel temperature TN=3.8 K, in magnetic fields H up to 145 k0e.
TL;DR: In this paper, a new approach to the experimental determination of the critical temperature of metamagnetic samples with non-zero demagnetizing factors is presented, which is applied to the Ni(NO 3 ) 2 ·2H 2 O, allowing the conclusion that this salt exhibits a tricritical point.
TL;DR: In this article, the transition from the para-to ferro-magnetic phase, accompanied by a transition to the mixed-valent state within a two-narrow-band model, is studied.
TL;DR: In this paper, a new model of temperature-induced metamagnetic phase transitions is considered for the class of the two-sublattice magnets with axial symmetry, which contains the usual Ising term as well as the coupling of the uniform strain with both exchange interaction and single ion anisotropy.
Abstract: A new model of the temperature-induced metamagnetic phase transitions is considered for the class of the two-sublattice magnets with axial symmetry. The model Hamiltonian contains the usual Ising term as well as the coupling of the uniform strain with both exchange interaction and single ion anisotropy. Within the MFA all these couplings are found to be necessary to produce the metamagnetic phase change. The results are compared with experiment.
[Russian Text Ignored].
TL;DR: In this paper, both continuous and discontinuous transitions form para-to-ferromagnetism within a model of electrons in double degenerate and hybridized band were discussed.