Combined k-space q-space pulsed ESR imaging: mapping of restricted diffusion in (FA)(2)PF(6).
A (FA)(2)PF(6) crystal from the family of the quasi-one-dimensional organic conductors was selectively damaged by a beam of Helium ions with a slitted mask placed in the beam's trajectory. Pulsed ESR density weighted imaging of the damaged crystal revealed the appearance of regions where the ESR signal was absent. The one-dimensional motion of the charge carriers was thus restricted to the undamaged sections. The local charge carrier spin dynamics in these restricted areas was probed by combined k-space q-space pulsed ESR imaging. The local expected appearance of the restricted pulsed gradient spin echo (PGSE) "diffusive diffraction" effect is shown. The position of the diffraction minima is compatible with the density imaging results.
Racah Institute, Hebrew University, Jerusalem, Israel. akivaf@vms.huji.ac.il
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Feintuch
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Tashma
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Grayevsky
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Gmeiner
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Dormann
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Kaplan