Measurement of interlayer spin diffusion in the organic conductor κ-(BEDT-TTF)₂Cu[N(CN)₂]X, X=Cl, Br

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• 作者：Á ; gnes Antal ; Titusz Fehé ; r ; Bá ; lint Ná ; frá ; di ; Richard Gaá ; l ; Lá ; szló ; Forró ; Andrá ; s Já ; nossy
• 关键词：Conduction electron spin resonance ; CESR ; Layered ; Anisotropic ; Organic conductor ; ET ; BEDT-TTF ; Quasi-two-dimensional ; Spin lifetime ; Spin transport ; Spintronics
• 刊名：Physica B
• 出版年：2010
• 出版时间：1 June 2010
• 年：2010
• 卷：405
• 期：11, Supplement 1
• 页码：S168-S171
• 全文大小：400 K

文摘

In organic conductors the overlap integral between layers is small, in-plane momentum scattering is rapid and transport perpendicular to the layers is expected to be blocked. We present a high frequency conduction electron spin resonance (CESR) study in the layered organic metals κ-(BEDT-TTF)₂Cu[N(CN)₂]X, X=Cl, Br, which verifies that the inter-layer spin hopping is effectively blocked. The method relies on resolving the CESR lines of adjacent layers in which the orientation of the g-factor tensors differs. We find that at ambient pressure and in the metallic phase the electron spin diffusion is two dimensional in both the X=Cl and Br compounds, i.e. electrons diffuse longer than the spin lifetime within a single molecular layer without inter-layer hopping. Application of pressure at 250 K increases rapidly the inter-layer hopping rate of spins.