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Electronic, structural and optical properties of the rare-earth-metal fullerides

Electronic, structural and optical properties of the rare-earth-metal fullerides

Objective

During my reintegration period in Prof. G. A. Kourouklis group (Aristotle University of Thessaloniki, Greece) we plan to study multinary alkaline-earth/lanthanide fulleride salts mainly by means of optical spectroscopic techniques like Raman and luminescence as a function of pressure and temperature. This work is a natural extension of our explorations during my initial M. Curie fellowship in Prof. K. Prassides group (University of Sussex, UK) on these systems which present the possibility of strong coupling between two electronically active sublattices, p(C60) and 4f,5d(rare-earth). Indeed, the rare-earth fullerides exhibit magnetic ordering at low temperatures or electronic phase transitions accompanied by remarkable structural response upon cooling and high-pressure application due to the fragility of the valence states of the lanthanide dopants.

As a first step we intend to study the Eu6-xSrxC60 (x: 1-5) compounds using the Raman technique at ambient and low temperature in order to investigate the exact role of the C60 molecular cages in their transitions to ferromagnetic states bellow 14 K, characterized by indirect lanthanide exchange interactions modulated by the C60 anions. Moreover, we plan to further elucidate the origin of the Ln2.75C60 (Ln: Sm, Yb ) fullerides structural anomalies under external perturbations like pressure and temperature, as well as the consequences of the Sm or Yb valence transitions on the electronic and vibrational properties of these compounds using accordingly the optical techniques mentioned above.

As a continuation of this project and based on the experience gained during my initial M. Curie fellowship, we will work on the isolation and study of the vibrational, electronic and structural properties of the (Ln1-xLn and apos;x) yC60 and (Ln1-xAEx)yC60 (Ln, Ln and apos;: Sm, Yb, Eu, AE: Ba, Sr, x: 0-1, y= 2.75, 6) families, which are also expected to display spectacular physical properties due to strong electron correlations.

Coordinator

ARISTOTLE UNIVERSITY OF THESSALONIKI

Address

Administration Building, University Campus
Thessaloniki

Greece

Administrative Contact

Dimitrios CHRISTOFILOS (Dr)

Project information

Grant agreement ID: 513606

  • Start date

    1 January 2005

  • End date

    31 December 2005

Funded under:

FP6-MOBILITY

  • Overall budget:

    € 40 000

  • EU contribution

    € 40 000

Coordinated by:

ARISTOTLE UNIVERSITY OF THESSALONIKI

Greece