Metamagnetism

About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.

Metamagnetism Based on the Quadrupolar interaction in RCu2

Abstract: Abstract High-field magnetization measurements in single crystalline CeCu 2 , TbCu 2 and DyCu 2 with the orthorhombic CeCu 2 -type crystal structure have been carried out. A field-induced metamagnetic transition for the magnetic field along the c -axis is observed, which is caused by the switching of the different magnetic anisotropy states. The origin of the transition is discussed on the basis of the quadrupolar interaction and crystalline electric field.

Spin dependence of the quasiparticle masses in CeRu2Si2

Abstract: We have measured the spin dependence of the quasiparticle masses on the two small ellipsoidal Fermi surface sheets of CeRu 2 Si 2 via the dHvA effect. The field variation of the effective masses above the metamagnetic transition was obtained for the β ′ and γ ′ oscillations. We find that m ↓ * ( β ′ ) ≈ 5 m ↑ * ( β ′ ) , m ↓ * ( γ ′ ) ≈ 3 m ↑ * ( γ ′ ) .

Multiple Magnetic Transitions in a Frustrated Heavy-Fermion Antiferromagnet YbAgGe under Magnetic Field and Pressure

Abstract: The magnetization M and magnetoresistance of a heavy-fermion antiferromagnet YbAgGe have been measured under pressures P up to 2.7 GPa and magnetic fields B up to 9.5 T. This compound crystallizing in the hexagonal ZrNiAl-type structure with a quasi-kagome lattice of Yb ions has two magnetically ordered phases, namely, phase I ( T ≤ T M2 = 0.65 K) and phase II ( T M2 ≤ T ≤ T M1 = 0.8 K). With increasing pressure to 2.2 GPa, M ( B || a = 9.5 T) at 0.3 K increases from 1.5 µ B /Yb to 1.8 µ B /Yb, while M ( B || c = 9.5 T) hardly changes. The metamagnetic transition field in M ( B || a ) decreases from 4.6 T for P = 0 to 3.3 T for P = 2.2 GPa. As the pressure exceeds P * = 1.6 GPa, both T M and the initial slope of M ( B || a ) steeply increase and the area of phase I for B || a expands. These observations suggest that the magnetic frustration of the Yb quasi-kagome lattice is partially suppressed by the application of pressure above 1.6 GPa or magnetic field B || a above 4.5 T. Detailed B – T phase diagrams...

Pressure Effects on Molecular Magnets of Mn Complexes with Bisaminoxylbenzene Derivatives

Abstract: Pressure effects on the magnetic properties of a series of quasi-one-dimensional molecular magnets have been studied. The complexes of Mn(hfac) 2 (hfac = hexafluoroacethylacetonate) with 1,3-bis(N-tert-buthylaminoxyl)benzene and it's 5-halo- derivatives, abbreviated as 1 x (X = H, F, Cl and Br), have almost the same ferrimagnetic chain structure. The difference is seen in the interchain molecular arrangement. The complexes of 1 H and IF are metamagnets with weak interchain antiferromagnetic interactions, whereas 1 Cl and 1 Br are ferrimagnets with weak interchain ferromagnetic interactions. In two metamagnets (1 H , 1 F ), the pressurization simply results in the enhancement of the interchain antiferromagnetic interactions, which is reflected by the higher transition temperature and spin-flipping field. On the other hand, in the ferrimagnet (1 Cl ), the metamagnetic behavior is observed under pressure. It is suggested that the subtle change of the relative arrangement of chain structures affects the interchain ferromagnetic interactions.