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| Home > Publications database > Hard X-ray photoemission study of the Fabre salts $\mathrm{(TMTTF)_2X (X = SbF_6}$ and $\mathrm{PF_6)}$ |
| Home > Publications database > Hard X-ray photoemission study of the Fabre salts $\mathrm{(TMTTF)_2X (X = SbF_6}$ and $\mathrm{PF_6)}$ |
| Journal Article | PUBDB-2015-00173 |
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2014
Springer
Berlin
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Please use a persistent id in citations: doi:10.1140/epjb/e2014-50499-y
Abstract: Core-level photoemission spectra of the Fabre salts with X = SbF6 and PF6 were taken using hard X-rays from PETRA III, Hamburg. In these salts TMTTF layers show a significant stack dimerization with a charge transfer of 1e per dimer to the anion SbF6 or PF6 . At room temperature and slightly below the core-level spectra exhibit single lines, characteristic for a well-screened metallic state. At reduced temperatures progressive charge localization sets in, followed by a 2nd order phase transition into a charge-ordered ground state. In both salts groups of new core-level signals occur, shifted towards lower kinetic energies. This is indicative of a reduced transverse-conductivity across the anion layers, visible as layer-dependent charge depletion for both samples. The surface potential was traced via shifts of core-level signals of an adsorbate. A well-defined potential could be established by a conducting cap layer of 5 nm aluminum which appears “transparent” due to the large probing depth of HAXPES (8–10 nm). At the transition into the charge-ordered phase the fluorine 1s line of (TMTTF)2 SbF6 shifts by 2.8 eV to higher binding energy. This is a spectroscopic fingerprint of the loss of inversion symmetry accompanied by a cooperative shift of the SbF6 anions towards the more positively charged TMTTF donors. This shift does not occur for the X = PF6 compound, most likely due to smaller charge disproportion or due to thepresence of charge disorder.
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