Measurement of interlayer spin diffusion in the organic conductor , , Br

✍ Scribed by Ágnes Antal; Titusz Fehér; Bálint Náfrádi; Richard Gaál; László Forró; András Jánossy

• Book ID: 103887945
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 400 KB
• Volume: 405
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2009.11.024

✦ Synopsis

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 k-ðBEDT-TTFÞ 2 Cu½NðCNÞ 2 X, X ¼ 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 ¼ 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.