Topology and spin dynamics in magnetic molecules

摘要: We investigate the role of topology and distortions in quantum dynamics magnetic molecules, using a cyclic spin system as reference. consider three variants an antiferromagnetic molecular ring, i.e., ${\mathrm{Cr}}_{8}$, ${\mathrm{Cr}}_{7}\mathrm{Zn}$, ${\mathrm{Cr}}_{7}\mathrm{Ni}$, characterized by low-lying states with different total $S$. theoretically experimentally study low-temperature behavior torque function applied field. Near level crossings, this observable selectively probes fluctuations (``$S$ mixing'') induced lowering ideal ring symmetry. show that while typical distortion model structure is very ineffective opening new $S$ mixing channels, major ingredient to control degree mixing. This conclusion further substantiated heat capacity measurements.