Spin diffusion and magnetic eigenoscillations confined to single molecular layers in the organic conductors kappa-(BEDT-TTF)2Cu[N(CN)2]X (X=Cl,Br).
Spin diffusion and magnetic eigenoscillations confined to single molecular layers in the organic conductors kappa-(BEDT-TTF)2Cu[N(CN)2]X (X=Cl,Br).
复制标题
自旋扩散和磁本征振荡仅限于有机导体 kappa-(BEDT-TTF)2Cu[N(CN)2]X (X=Cl,Br) 中的单分子层。
DOI：
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发表时间：
2008
影响因子：
8.6
通讯作者：
F. Fülöp
中科院分区：
文献类型：
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作者：
Á. Antal;T. Fehér;A. Jánossy;E. Tátrai;F. Fülöp
层状有机化合物kappa-（BEDT-TTF）_2Cu [N（CN）_2]X（X=Cl，Br）在室温下是金属。在低温下，Cl化合物是弱铁磁性的Mott绝缘体，而同构的Br化合物是超导体。通过传导电子自旋共振和反铁磁共振（AFMR），我们发现这些材料的自旋输运和磁相互作用的极端各向异性。在金属状态下，自旋扩散被限制在10（-9）s的自旋寿命内的单分子层。电子扩散了几百nm而没有层间跳跃。在Cl化合物磁有序绝缘相中，我们观察并计算了弱耦合单分子层的四个AFMR模。平面间交换场与典型的ImT偶极场相当或小于典型的ImT偶极场，并且比层内交换场小几乎10（6）倍。
The layered organic compounds, kappa-(BEDT-TTF)2Cu[N(CN)2]X X=Cl, Br) are metals at ambient temperatures. At low temperatures, the Cl compound is a weakly ferromagnetic Mott insulator while the isostructural Br compound is a superconductor. We find by conduction electron spin resonance and antiferromagnetic resonance (AFMR) an extreme anisotropy of spin transport and magnetic interactions in these materials. In the metallic state spin diffusion is confined to single molecular layers within the spin lifetime of 10(-9) s. Electrons diffuse several hundreds of nm without interlayer hopping. In the magnetically ordered insulating phase of the Cl compound we observe and calculate the four AFMR modes of the weakly coupled single molecular layers. The interplane exchange field is comparable or less than the typically 1 mT dipolar field and almost 10(6) times less than the intralayer exchange field.