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2 Materials Science Poland

2 2004

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Quantum oscillation measurements on the organic superconductor ?-(BEDT-TTF)2I3

Nothardt A., Balthes E., Salameh B., Schmidt W., Schweitzer D., Strempfer J., Keimer D., Maude D.

Materials Science Poland

2004

Vol. 22, No. 4

299--305

Quantum oscillation experiments were performed on high quality single crystals of ?-(BEDT-TTF)2I3. Their electronic properties are similar to those of crystals of ?-(BEDT-TTF)2(I3)1-x(AuI2)x (x < 0.02). Nevertheless, in the neat crystals used here, quantum oscillations for the a-orbit (Fa?= 780 T) are observed already at a field of 2 T, and the magnetic breakdown of the a-orbit (Fa= 4200 T) occurs at 3 T. In the large magnetic field range, in which quantum oscillations are observed, the warping of the Fermi surface of the a-orbit and a-orbit could be determined to be aFa?= 6.6 T and aFa?= 16.6 T, respectively. At high magnetic fields, the de Haas-van Alphen signal consists of pronounced inverse saw-tooth oscillations, and the Shubnikov-de Haas signal has a peaked structure. This behaviour is interpreted in terms of magnetic interaction.

Electron-electron correlations in (BEDT-TTF)2I3 organic superconductors

Balthes E., Nothardt A., Wyder P., Schweitzer D.

Materials Science Poland

2004

Vol. 22, No. 4

285--298

The detection of the fractional Landau level filling factor a?= 1/2 and low integer filling factors in the two-dimensional multilayer organic metal a-(BED-TTF)2I3 is presented, which shows the occurrence of electron localisation and electron-electron correlation in this bulk metallic two-dimensional system. These effects are found in the normal conducting state of the organic superconductor a-(BEDT-TTF)2I3. In addition, quantum oscillation measurements are found to be a very promising tool for direct detection of the chemical potential and its variation with magnetic field, even under rather complex fermiological conditions.