Electronic properties of the organic metals Θ(BEDTTTF)2I3 and ΘT(BEDTTTF)2I3

B. Salameh, A. Nothardt, E. Balthes, W. Schmidt, D. Schweitzer, J. Strempfer, B. Hinrichsen, M. Jansen, and D. K. Maude
Phys. Rev. B 75, 054509 – Published 12 February 2007

Abstract

Investigations of the structures and electronic properties of neat single crystals of the organic metals Θ(BEDTTTF)2I3 and ΘT(BEDTTTF)2I3—a tempered phase of Θ(BEDTTTF)2I3—are presented and compared. It will be shown that in contrast to the Θ-phase crystals, where only 30% of the crystals become superconducting at 3.6K, all crystals of the ΘT-phase become superconducting at about 5K. The origin for this behavior is discussed. Temperature-dependent resistivity and susceptibility measurements as well as electron spin resonance investigations of both types of crystals are presented and discussed. The Fermi surfaces of both materials were investigated by de Haas van Alphen and Shubnikov de Haas experiments at 0.4K. The results are compared with predictions of a band structure calculation as well as experiments on a similar material, namely, Θ(BEDTTTF)2(I3)1x(AuI2)x(x<0.02), known from literature. In addition, the effective masses of two orbits of Θ(BEDTTTF)2I3 were investigated as a function of the angle of the magnetic field with respect to the conducting planes. Furthermore, it will be shown that in high magnetic fields “inverse” saw-tooth oscillations in magnetization in Θ(BEDTTTF)2I3 crystals occur, whereas in ΘT(BEDTTTF)2I3 crystals under the same conditions, very symmetric oscillations are observed. The origin of the “inverse” saw-tooth is discussed and magnetic interaction as the most probable origin is proposed.

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  • Received 10 October 2006

DOI:https://doi.org/10.1103/PhysRevB.75.054509

©2007 American Physical Society

Authors & Affiliations

B. Salameh*, A. Nothardt, E. Balthes, W. Schmidt, and D. Schweitzer

  • 3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70050 Stuttgart, Germany

J. Strempfer, B. Hinrichsen, and M. Jansen

  • Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany

D. K. Maude

  • Grenoble High Magnetic Field Laboratory, 25 Avenue des Martyrs, B. P. 166, 38042 Grenoble, Cedex 9, France

  • *Permanent address: Department of Applied Physics, Tafila Technical University, P.O. Box 179, Tafila 66110, Jordan.
  • Email address: d.schweitzer@physik.uni-stuttgart.de

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Issue

Vol. 75, Iss. 5 — 1 February 2007

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