Comparison of the Non‐linear Spin Dynamics in Antiferromagnetic Chain Compounds Na₂MnF₅ and (ND₄)₂MnF₅

Abstract

Na 2 Mn 0.98 Fe 0.02 F 5 and (ND 4 ) 2 Mn 0.98 Fe 0.02 F 5 was studied with the aid of Mössbauer spectroscopy. These results were interpreted on the basis of classical soliton theory. In order to confirm this concept, we have performed neutron scattering experiments on large single crystals of the pure compounds. We discuss the results obtained on a thermal and cold three-axis spectrometer, which probe the magnon spin wave excitations and the existence of the nonlinear excitations in the quasi 1-d antiferromagnetic chains of Na 2 MnF 5 and (ND 4 ) 2 MnF 5 , respectively. Additionally, we include elastic neutron diffraction and dc. single crystal susceptibility measurements to determine the magnetic structure. From the width of the quasielastic scattering signal the temperature dependence of the

Room Temperature Magnetic Switchability Assisted by Hysteretic Valence Tautomerism in a Layered Two-Dimensional Manganese-Radical Coordination Framework

“…On the one hand, the short distances (1.83 and 1.85 Å) are unrealistic for Mn­(II). On the other hand, the overall contraction along one preferential axis is the signature of a compressed Jahn–Teller Mn­(III) system. − …”