Chaotic regimes of antiferromagnetic resonance in a quasi-two-dimensional easy-axis antiferromagnet (NH3)2(CH2)4MnCl4

Abstract

Chaotic regimes of the microwave energy absorption are experimentally observed and analyzed for two-dimensional metallorganic antiferromagnet (NH 3 ) 2 (CH 2 ) 4 MnCl 4 at low temperatures under the conditions of nonlinear antiferromagnetic resonance. Relaxation oscillations of energy absorption are investigated in detail. Their frequency spectra, frequency-amplitude characteristics, and dependences of absorbed power on driving power and static magnetic field are studied. It is shown that the dynamics of relaxation oscillations undergoes a transition to chaos by "irregular periods". Peculiarities of the transition are described consistently. Among other things, the conditions for the emergence of energy absorption regimes with a spike-like and a saw-tooth signal structure are determined, and the characteristics of chaotic oscillations such as the dimensions of strange attractors are calculated. The chaotic dynamics is found to be high-dimensional with a large contribution from noise which is of deterministic origin in the antiferromagnet under in-1 vestigation.

Physicochemical Property Investigations of Perovskite-Type Layer Crystals [NH3(CH2)nNH3]CdCl4 (n = 2, 3, and 4) as a Function of Length n of CH2

“…In the case of M = Mn, Cu, and Cd, the crystal structures consist of an alternate octahedron (MX 6 ) 2– and organic chains. In the case of M = Co and Zn, isolated tetrahedral structures are formed, where an inorganic layer of (MX 4 ) 2– is sandwiched between the layers of an organic cation. − Perovskite compounds composed of [NH 3 (CH 2 ) n NH 3 ] cations and MX 4 anions are zero-dimensional, whereas those containing MX 6 anions are two-dimensional. Furthermore, several studies focusing on their molecular structure have reported even–odd effects as the number of carbon atoms in the diammonium chain changes, which affects the structural properties of these materials .…”

Study on crystal structure, thermal property, and nuclear magnetic resonance spin-lattice relaxation times of organic-inorganic hybrid [NH 3 (CH 2 ) 6 NH 3 ]ZnCl 4

“…In this study, organic-inorganic hybrid [NH 3 (CH 2 ) 6 NH 3 ]ZnCl 4 single crystals replacing with eco-friendly were grown using the aqueous solution method, and their crystal structures, phase transition temperatures (T C ), and thermal properties were studied. The effect of temperature on coordination geometry, which can provide valuable insights into the physical and chemical properties of compounds, was discussed based on information obtained from 1 H, 13 C, and 14 N nuclear magnetic resonance (NMR) chemical shifts. The energy transfer was investigated by employing the spin-lattice relaxation time (T 1ρ ).…”

Effect of Methylene Chain Length on the Thermodynamic Properties, Ferroelastic Properties, and Molecular Dynamics of the Perovskite-type Layer Crystal [NH3(CH2)nNH3]MnCl4 (n = 2, 3, and 4)

“…The properties depend on factors such as the characteristics of organic cations and geometry of the inorganic metal halide anions ((MX 6 ) 2– or (MX 4 ) 2– ) constituting the crystal. − When M = Mn, Cu, and Cd, the crystal structures consist of alternate octahedron (MX 6 ) 2– and organic chains. In contrast, when M = Co and Zn, isolated tetrahedral structures are formed, where an inorganic layer of (MX 4 ) 2– is sandwiched between layers of an organic cation. − The ammonium ions bonded at both ends of the organic chain combine with the halide ions in the inorganic layer and stabilize the layered structure by forming N–H···X hydrogen bonds. The organic chains extend along the a -axis.…”