Showing papers on "Metamagnetism published in 1987"
TL;DR: In this paper, extensive magnetization and magnetoresistivity experiments on CeRu2Si2 are described, with special emphasis on the metamagnetic-like transition that occurs atH*=80 kOe.
Abstract: Extensive magnetization and magnetoresistivity experiments on CeRu2Si2 are described, with special emphasis on the metamagnetic-like transition that occurs atH*=80 kOe. By contrast to the low-field susceptibility, the differential susceptibility atH* almost diverges atT→0. It is suggested that high magnetic fields (H>H*) restore a situation where the interactions between particles have collapsed. Comparison is made with other well-known examples: TiBe2, UPt3, TmSe, and3He.
301 citations
TL;DR: Magnetization measurements have been carried out on the Laves phase compounds M(Co 1− x Al x ) 2 (M = Y, Lu) up to 42 T as discussed by the authors.
35 citations
TL;DR: In this article, the critical field of the transition and spontaneous moment after the transition of ScCo 2 can be estimated to be a few megagauss and about 0.4 µ B /Co, respectively.
Abstract: Anomalous magnetization curves observed under the strong pulsed magnetic fields up to 520 kOe are understood with itinerant electron metamagnetism. From the results of Sc(Co 1- x Al x ) 2 the critical field of the transition and the spontaneous moment after the transition of ScCo 2 can be estimated to be a few megagauss and about 0.4 µ B /Co, respectively. These are consistent with recent theoretical results.
26 citations
TL;DR: In this paper, the de Almeida-Thouless line has a jump when crossing the metamagnetic phase transition line which results in discontinuous transition into the nonergodic state.
Abstract: Phase diagrams and magnetic properties of the frustrated metamagnets have been studied. We have shown that strong disorder can narrow the temperature and the magnetic-field interval where the metamagnetic transition takes place. With increasing disorder this discontinuous transition disappears transforming into the second-order phase transition. The magnetic field usually widens the region of the (H, T) phase diagram where the antiferromagnetic nonergodic state exists. The de Almeida-Thouless line has a jump when crossing the metamagnetic phase transition line which results in discontinuous transition into the nonergodic state.
22 citations
TL;DR: The magnetization of a singlet-ground-state magnet CsFeCl 3 at 4.2 and 1.3 K is measured by the pulsed magnetic field up to 40 T applied parallel to the crystal c -axis as discussed by the authors.
20 citations
TL;DR: In this article, the electronic structure of d-electrons under external magnetic field is calculated for ScCo2, YCo2 and LuCo2 in the self-consistent tight-binding approximation and the field dependence of the induced moment is estimated in the Hartree-Fock approximation.
19 citations
TL;DR: In this paper, the electronic structure of d electrons in the cubic Laves phase of the intermetallic compounds ScCo2 and LuCo2 under an external magnetic field is calculated in the tight-binding approximation and in the Hartree-Fock approximation.
Abstract: The electronic structure of d electrons in the cubic Laves phase of the intermetallic compounds ScCo2 and LuCo2 under an external magnetic field is calculated in the tight-binding approximation and in the Hartree-Fock approximation The field dependence of the induced moment is obtained at 0K It is shown that the metamagnetic transition from the paramagnetic to the ferromagnetic state can occur at about 120 and 94 T for ScCo2 and LuCo2, respectively
18 citations
01 Jan 1987
TL;DR: In this paper, a more complex class of magnetic phase transitions are found such as systems with a non-magnetic ground state induced either by zero field splitting, or in the case of magnetic chains, by alternating AF interactions.
Abstract: Phase transitions are of current interest in many areas of condensed matter physics They occur in many systems, among them we can mention liquid-gas transition, superfluidity, binary alloys (such as β-brass), structural phase transitions and magnetic phase transitions (MPT) The MPT are especially interesting because of the wide variety of available magnetic compounds with different lattices, spins and interactions The simplest case of an MPT is the ferromagnetic transition which is usually of second order and only occurs in zero magnetic field The case of two sublattices antiferromagnets is richer since they undergo phase transitions in a certain range of applied magnetic fields, which can be of first order (metamagnetism; spin-flop phases) Besides these simple ferromagnets and antiferromagnets (F and AF), other magnetic compounds which exhibit a more complex class of phase transitions are found such as: systems with a non magnetic ground state induced either by zero field splitting, or in the case of magnetic chains, by alternating AF interactions; magnetic chains with a large magnetoelastic coupling inducing a spin-Peierls transition; frustrated antiferromagnets with more than two sublattices or with incommensurate magnetic ordering
14 citations
TL;DR: In this paper, high field magnetization measurements have been performed to examine the existence of itinerant metamagnetism in exchange-enhanced systems related to YCo2 together with Fe1−x CoxSi.
12 citations
TL;DR: In this article, it was shown that quasiparticle interactions, in addition to the special DOS, may account for the effect of heavy-fermion systems' susceptibility at a critical magnetic field.
11 citations
TL;DR: In this paper, high field measurements on UPt3 (H ≦ 21 T) were performed in order to study at constant field the field dependence A(H) of the T2 term of the resistivity.
TL;DR: In this paper, the electrical resistivity and the magnetization of CeZn 2 have been measured and the Kondo anomaly is found in electrical resistivities and magnetization shows a very large magnetic anisotropy and metamagnetic transitions with three steps only for fields along b -axis.
Abstract: The electrical resistivity and the magnetization of CeZn 2 have been measured. Kondo anomaly is found in the electrical resistivity and the magnetization shows a very large magnetic anisotropy and metamagnetic transitions with three steps only for fields along b -axis. The saturation magnetization per Ce is 1.75 µ B at 1.3 K and 4.2 K. These results are briefly discussed with a recent theory of Kondo effect and a simple thermodynamical model.
TL;DR: In this article, the 3d and/or 4f magnetic instabilities in rare earth R-3d metal compounds are illustrated for three types of systems: i) the Y-Ni system with a special emphasis on the "thermal spontaneous magnetization" observed in Y 2 Ni 7, ii) the R-Co system where "collective electron metamagnetism" and Co antiferromagnetic magnetism are observed in the RCo 2 (as in ThCo 5 ), and in La 2 Co 1.7 and La2 Co 3, respectively;
TL;DR: The field induced anomaly in the compressibility of CeRu 2 Si 2 is shown to have most of its origin in the pressure-induced magnetization changes as mentioned in this paper, and the measured sound velocity remains compatible with the metamagnetic tendancy, deduced from the melting pressure lowering.
TL;DR: Pereira da Cunha et al. as discussed by the authors presented a paper on the work of the Departamento de Fisica e Quimica da Faculdade de Engenharia de Guaratingueta UNESP.
TL;DR: In this article, magnetization and electrical resistivity measurements have been performed on NdAg 1-x In x (0≦ x ≦08) with the CsCl type structure.
Abstract: The magnetization and electrical resistivity measurements have been performed on NdAg 1- x In x (0≦ x ≦08) with the CsCl type structure The compound for x ≦005 has only one antiferromagnetic ordered phase The ferromagnetism appears at 005< x ≦06 accompanied by a metamagnetism below T f which is about half as high as T C All the compound with 06≦ x ≦08 has two antiferromagnetic phases below T a and between T a and T N The ferromagnetic moment is as large as 22 µ B indicating the \(\varGamma_{8}^{1)}\) is the ground state but the paramagnetic moment above 77 K corresponds to the value of Nd 3+ free ion In the electrical resistivity, the temperature gradient changes at T C and T N and the magnitude changes at T f and T a where the temperature hysteresis is not observed
TL;DR: In this paper, the ac magnetic susceptibility of [N(CH 3 ) 4 ]NiBr 3 has been studied as a function of external magnetic field, which behaves as a metamagnet.
Abstract: The ac magnetic susceptibility of [N(CH 3 ) 4 ]NiBr 3 has been studied as a function of external field. The substance behaves as a metamagnet. Portions of the phase diagram are presented; the best-fit parameters are D / k B =4.7 K and z ′ J ′/ k B =0.032 K. The ratio of interchain to intrachain interaction is 10 -2 .