Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.156: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

EPR Study of N@C₆₀ and P@C₆₀ in 1D Matrices — •Ch. Spudat¹, W. Harneit¹, B. Naydenov¹, M. Scheloske¹, H.I. Süss², and J. Hullinger ² — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimalle 14, 14159 Berlin, Germany
— ²Dept. f. Chemie & Biochemie, Universität Bern, Freiestrasse 3, 3012 Bern , Switzerland
We will present our latest results towards the electron spin quantum computer (QC) based on the group V endohedral fullerenes N@C₆₀ and P@C₆₀ as qubits. These molecules are very suitable for QC purposes because of their very long relaxation times and the possibility of good scalability [1]. We show the dependence of the spin-spin relaxation of polycrystalline P@C60 samples on the temperature and on spin concentration. At low temperatures and low concentrations, we found a value of T₂ = 150 µ s, which is very long for molecular systems. We also managed to align our fullerenes in the perfectly one-dimensional channels of the organic crystal BrPOT (2,4,6-tris-(4-bromo-phenoxy)-1,3,5-triazine) as described in [2]. The inclusion lowers the symmetry of the fullerene cage and gives rise to a considerable zero-field splitting. This provides a way to selectively address the (±3/2; ±1/2) and (1/2;-1/2) transitions, giving access to all internal spin degrees of freedom. The relaxation times of the corresponding transitions are also presented.

[1] W. Harneit, Phys. Rev. A 65 (2003) 032322

[2] H.I. Süss, M. Lutz, J. Hulliger, Cryst. Eng. Comm. 4 (2002) 610