Spatially resolved and integral measurements of the electron spin diffusion properties of an organic quasi 1-D conductor

Drescher, Malte; Jauregui, D. Saez de; Matejcek, S.; Dormann, E.

doi:10.1016/j.synthmet.2005.07.110

Cited by 5 publications

(5 citation statements)

References 21 publications

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“…A sequence of measurements for varied thickness of crystal slices is required for extrapolation of D ⊥ to vanishing instrumental distortion. This opens the possibility of a clear-cut separation of parallel-and perpendicular-to-stack motion for arene salts allowing a more systematic variation of the defect content (x d ) [19]. These comprehensive studies can only be realized for fluoranthene radical cation salts, not susceptible to uncontrolled sample variations caused by solvent inclusion in the crystal structure.…”

Section: Discussionmentioning

confidence: 99%

Anisotropy of charge and spin motion in perylene hexafluoroarsenate salts

Warth¹,

Jauregui²,

Dormann³

2005

J. Phys.: Condens. Matter

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Conduction electron spin echo attenuation in well defined magnetic field gradients provides more accurate values of the anisotropy of electron spin motion than microwave conductivity measurements. The electron spin diffusion coefficient for motion along the perylene (PE) radical cation stack, D (T ), in the PE hexafluoroarsenate salt is influenced temperature dependently by perpendicular-to-stack motion and reflects the varying average unrestricted chain length, l (T ). The anisotropy of D (T ):D ⊥ (T ) is larger than 7300:1 at 250 K.

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Section: Discussionmentioning

confidence: 99%

Anisotropy of charge and spin motion in perylene hexafluoroarsenate salts

Warth¹,

Jauregui²,

Dormann³

2005

J. Phys.: Condens. Matter

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“…47,55 In order to realize a high defect concentration x = 1.1%, the respective crystal was irradiated with a highenergy proton beam to a dose of up to 5.4ϫ 10 16 protons per cm 2 at room temperature ͑E p = 25 MeV, t = 0.75 h, I = 0.1 A͒. 39,40 Under such conditions, the Peierls transition temperature of ͑FA͒ 2 PF 6 is lowered substantially, to T P = 131.5 K. 43 It has been shown before that the Peierls transition in arene radical cation salts can be suppressed by disorder in the anion channel. 56 This results from the role played by the anions in coupling the 1D CDW fluctuations.…”

Section: A Sample Preparationmentioning

confidence: 99%

“…32 Thus the experimental techniques established earlier for the derivation of the spin diffusion coefficient D͑T͒, its anisotropy D͑͒, and the spatial restriction of spin diffusion due to broken chains or exchange interaction with paramagnetic defects, l ʈ ͑T͒, can be adopted. [29][30][31][33][34][35][36][37][38][39][40][41][42][43] This is exploited here for different ͑FA͒ 2 PF 6 single crystals with controlled content of defects, allowing extrapolation to the behavior of ideal ͑FA͒ 2 PF 6 crystals. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal and transverse diffusion of conduction-electron spins on stacks of fluoranthene radical cations

2006

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The temperature dependence and anisotropy of the conduction-electron spin diffusion coefficient D͑T͒ of three single crystals of the organic conductor ͑fluoranthene͒ 2 PF 6 with defect content varying between 7 ϫ 10 −5 and 1% per formula unit have been determined. D ʈ / D Ќ varies between 2 ϫ 10 4 and 100 in the metallic phase. The defect dependences of the Peierls transition, microwave conductivity, magnetic susceptibility, and transverse relaxation rate are presented as well and their relations are discussed.

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“…In many cases, a structural phase transition is observed above T P with modification of the packing of the arenes and anions perpendicular to the stacking direction 5 . Disorder in the anion stack or radiation damage lowers, or even prevents, the Peierls transition 6 . A peculiarity of these 1D metals is the relatively long conduction electron spin relaxation time (T 1 , T 2 ), of up to 10 m̈s at room temperature, resulting from weak spin‐orbit coupling of the electron spins in arene‐orbitals and the highly 1D motion in the arene radical cation stacks 7 .…”

Section: Introductionmentioning

confidence: 99%

ESR Imaging of Conduction Electrons in Organic Conductors

Dormann

Feintuch

Kaplan

2008

Israel Journal of Chemistry

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In organic conductors built from stacks of planar aromatic hydrocarbons the mobility of the conduction electrons perpendicular to the radical cation stacks is more than four orders of magnitude smaller than the respective along‐the‐stack value. Thus the macroscopic properties of real single crystals of such radical cation salts are strongly influenced by the distribution of inevitable defects. Therefore, spatial resolution is required for a meaningful interpretation of the ESR data. Various schemes for 2D and 3D ESR imaging have been realized in the radio frequency and microwave frequency range with a resolution down to 10 m̈m. Spatial distribution of spin density, T1, T2, and spin diffusion coefficient D were recorded, often as a function of temperature. The conducting‐chain length distribution was observed. Our first attempts for the imaging of the integral and the spatially distributed carrier motion caused by an applied electric current were successful.

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Spatially resolved and integral measurements of the electron spin diffusion properties of an organic quasi 1-D conductor

Cited by 5 publications

References 21 publications

Anisotropy of charge and spin motion in perylene hexafluoroarsenate salts

Anisotropy of charge and spin motion in perylene hexafluoroarsenate salts

Longitudinal and transverse diffusion of conduction-electron spins on stacks of fluoranthene radical cations

ESR Imaging of Conduction Electrons in Organic Conductors

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