Interplay between the d- and pi-electron systems in magnetic torque of the layered organic conductor \k{appa}-(BETS)2Mn[N(CN)2]3

摘要

In the organic charge transfer salt k-(BETS)2Mn[N(CN)2]3 the metallicconductivity is provided by itinerant pi-electrons in the layers of BETSmolecules, whereas magnetization is largely dominated by the localizedd-electrons of the Mn2+ ions in the insulating anionic layers. We studymagnetic properties of the compound in its low-temperature, Mott-insulatingstate by means of magnetic torque technique. The complex behavior of the torquecan be qualitatively explained by the coexistence of two weakly interactingmagnetic subsystems associated with paramagnetic d-electron spins andantiferromagnetically ordered pi-electron spins, respectively. Based on theexperimental data, we determine the principal axes of magnetization of the Mn2+sublattice and propose a qualitative model for the pi-electron spinarrangement, implying an important role of the Dzyaloshinskii-Moriyainteraction.