Staggered Spin Order of Localized π-electrons in the Insulating State of the Organic Conductor κ-(BETS)2Mn[N(CN)2]3
O. M. Vyaselev, M. V. Kartsovnik*, N. D. Kushch+, E. B. Yagubskii+
Institute of Solid State Physics RAS, 142432 Chernogolovka, Russia
*Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
+Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia
Abstract
Magnetic properties of the conduction π-electron system of
κ-(BETS)2Mn[N(CN)2]3 have been probed using 13C NMR. At
ambient pressure, the metal-insulator transition observed in the resistivity
measurements below K is shown to be accompanied by ordering of the
π-spins in a long-range staggered structure. As the metal-insulator
transition is suppressed by applying a small pressure of kbar, the
π-spin system maintains the properties of the metallic state down to 5 K.