The 1 H-NMR spectrum and nuclear relaxation rate T −1 1 in the antiferromagnetic wheel CsFe8 were measured to characterize the previously observed magnetic field-induced low-temperature phase around the level crossing at 8 T. The data show that the phase is characterized by a huge staggered transverse polarization of the electronic Fe spins, and the opening of a gap, providing microscopic evidence for the interpretation of the phase as a field-induced magneto-elastic instability. . Due to the quasi degeneracy near the LC, the magnetism of the molecule is sensitive to weak interactions with the environment, such as the lattice vibrations or the surrounding magnetic molecules. Studying the LCs in AFM wheels is hence of broad interest as it provides experimental insight into the interplay of a mesoscopic quantum system with its environment.The molecule [CsFe 8 {N(CH 2 CH 2 O) 3 } 8 ]Cl, or CsFe 8 in short [3], which realizes a ring of eight spin-5/2 Fe(III) ions, is particularly interesting as it is the only AFM wheel system in which magnetic torque studies revealed a phase transition below a temperature T c of about 0.7 K and in a field range of about ±1.5 T around the LC, between fields B c1 and B c2 [the phase diagram is sketched in the inset to Fig.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.