Novel electron spin resonance spectra of a tetrathiafulvalene salt of copper chloride, (TTF) 2CuCl2 |
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| Institution: | 1. Department of Chemical Engineering, Army Academy, Chung Li, Taiwan 32092, R. O. C;2. Center for General Education, Chung Yuan Christian University, Chung Li, Taiwan 32023, R. O. C;3. Department of Chemistry, Chung Yuan Christian University, Chung Li, Taiwan 32023, R. O. C;4. Department of Chemistry, University of Santo Tomas, España Boulevard, Manila 1008, Philippines;5. Department of Bioscience Technology, Chung Yuan Christian University, Chung Li, Taiwan 32023, R. O. C |
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| Abstract: | An ESR study has been carried out on electrically conducting (TTF)2CuCl2 crystals. The peak-to-peak width W of the ESR spectrum exhibited an unusual angular dependence with respect to the angle θ between the TTF-stack direction and the external field: the W showed a sharp minimum (4.9 G at 300 K) at θ = 0°, a maximum (7.5 G) at 60° (corresponding to 3cos2θ ∼ 1), and another minimum (6.9 G) at 90°. This angular depence has been explained by assuming an anisotropic motional narrowing that may arise from a spin correlation in one-dimensional electroconductive lattices. The temperature dependence of the W showed no anomaly around the temperature of metal-semiconductor transition: the spin relaxation is substantially unchanged by the phase transition. |
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