Magnetic transformations in the organic conductorκ-(BETS)2Mn[N(CN)2]3at the metal-insulator transition
Magnetic transformations in the organic conductorκ-(BETS)2Mn[N(CN)2]3at the metal-insulator transition
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有机导体κ-(BETS)2Mn[N(CN)2]3在金属-绝缘体转变时的磁转变
DOI：
10.1103/physrevb.83.094425
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发表时间：
2010
影响因子：
3.7
通讯作者：
I. Ras
中科院分区：
文献类型：
--
作者：
O.M.Vyaselev;M.V.Kartsovnik;W.Biberacher;L.V.Zorina;N.D.Kushch;E.B.Yagubskii Issp Ras;Chernogolovka;Russia;Wmi BAdW;Garching;Germany;I. Ras
对在T_MI~ 25 K发生金属-绝缘体转变的有机导体kappa-（BETS）_2Mn [N（CN）_2]_3的直流磁化强度、~ 1H NMR和磁矩进行了综合研究。核磁共振和磁化强度数据表明，在T_（MI）时，锰子系统从顺磁性转变为冻结态，但不是简单的Neel型有序.此外，在低于T_MI的温度下的扭矩测量中已经检测到类似于自旋翻转的磁场诱导转变。这种转变很可能与有机分子BETS上的π电子的自旋有关，并通过交换相互作用与锰的3d自旋耦合。
A complex study of magnetic properties including dc magnetization, 1H NMR and magnetic torque measurements has been performed for the organic conductor kappa-(BETS)2Mn[N(CN)2]3 which undergoes a metal-insulator transition at T_MI~25K. NMR and the magnetization data indicate a transition in the manganese subsystem from paramagnetic to a frozen state at T_MI, which is, however, not a simple Neel type order. Further, a magnetic field induced transition resembling a spin flop has been detected in the torque measurements at temperatures below T_MI. This transition is most likely related to the spins of pi-electrons localized on the organic molecules BETS and coupled with the manganese 3d spins via exchange interaction.