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- W2023252806 abstract "High-field magnetotransport investigations of single crystals of the quasi-two-dimensional organic compound x-(BEDT-TTF)2I3 under hydrostatic pressure up to 9 × 108 Pa are presented. Pronounced Shubnikov-de Haas oscillations are observed in magnetic fields up to 12 T over the whole pressure range. These quantum oscillations are affected remarkably by hydrostatic pressure. All of the four fundamental fields detected rise with increasing pressure corresponding to an enhancement of the extremal areas of the Fermi surface in x-(BEDT-TTF)2I3. The experimentally determined cyclotron effective masses of the charge carriers decrease with increasing pressure. The FFT amplitudes of the Shubnikov-de Haas oscillations show a very complex pressure dependence reflecting a more complicated structure of the electron system than the relatively simple topology of the calculated Fermi surface involves. The pressure-induced changes of the Fermi surface are discussed in the framework of an effective dimer model and compared with equivalent investigations on the isostructural compound x-(ET)2Cu(NCS)2. Es werden Magnetotransport-Untersuchungen an Einkristallen der quasi-zweidimensionalen organischen Verbindung x-(BEDT-TTF)2I3 unter hydrostatischem Druck bis 9 × 108 Pa vorgestellt. Im gesamtem Druckbereich sind in Magnetfeldern bis 12 T ausgeprägte Shubnikov-de Haas-Oszillationen zu beobachten. Diese Quantenoszillationen ändern sich deutlich unter dem Einfluβ von hohem hydrostatischen Druck. Alle vier nachgewiesenen Fundamentalfelder nehmen bei Druckerhöhung zu, verbunden mit einer Vergröerung der Extremalquerschnitte der Fermi-Oberfläche in x-(BEDT-TTF)2I3. Die experimentell bestimmten effektiven Zyklotronmassen der Ladungsträger sinken unter Druckzunahme. Die FFT Amplituden der Shubnikov-de Haas-Oszillation zeigen eine sehr komplexe Druckabhängigkeit, die auf eine kompliziertere Elektronenstruktur, als sich aus der relativ einfachen Topologie der berechneten Fermi-Oberfläche ergibt, schließen läβt. Die druckinduzierten Veränderungen der Fermi-Oberfläche werden im Rahmen eines effektiven Dimer-Modells diskutiert und mit äquivalenten Untersuchungen an der isostrukturellen Verbindung x-(ET)2Cu(NCS)2 verglichen." @default.
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- W2023252806 date "1996-05-01" @default.
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- W2023252806 title "Effect of high hydrostatic pressure on the magnetoresistance quantum oscillations of the quasi-two-dimensional organic superconductor x-(BEDT-TTF)2i3" @default.
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- W2023252806 doi "https://doi.org/10.1002/pssb.2221950126" @default.
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