Quantum spin dynamics

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Direct optical excitation of a fullerene-incarcerated metal ion

Chemical Physics Letters 428:4-6 (2006) 303-306

Authors:

MAG Jones, RA Taylor, A Ardavan, K Porfyrakis, GAD Briggs

Abstract:

The endohedral fullerene Er3N@C80 shows characteristic 1.5 μm photoluminescence at cryogenic temperatures associated with radiative relaxation from the crystal-field split Er3+ 4I13/2 manifold to the 4I15/2 manifold. Previous observations of this luminescence were carried out by photoexcitation of the fullerene cage states leading to relaxation via the ionic states. We present direct non-cage-mediated optical interaction with the erbium ion. We have used this interaction to complete a photoluminescence-excitation map of the Er3+ 4I13/2 manifold. This ability to interact directly with the states of an incarcerated ion suggests the possibility of coherently manipulating fullerene qubit states with light. © 2006 Elsevier B.V. All rights reserved.
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Will spin-relaxation times in molecular magnets permit quantum information processing?

(2006)

Authors:

Arzhang Ardavan, Olivier Rival, John JL Morton, Stephen J Blundell, Alexei M Tyryshkin, Grigore A Timco, Richard EP Winnpenny
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The effects of a pyrrolidine functional group on the magnetic properties of N@C60

(2006)

Authors:

Jinying Zhang, John JL Morton, Mark R Sambrook, Kyriakos Porfyrakis, Arzhang Ardavan, G Andrew D Briggs
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Magnetothermoelectric effects in (TMTSF)2 Cl O4

Physical Review B Condensed Matter and Materials Physics 74:7 (2006)

Authors:

MS Nam, A Ardavan, W Wu, PM Chaikin

Abstract:

We have measured the thermopower and Nernst effects in the quasi-one-dimensional organic molecular metal (TMTSF)2 Cl O4 as a function of temperature and magnetic field strength and orientation. At 10 K this material exhibits a maximum Nernst coefficient of 12 μVKT, one of the largest ever observed in a metal. The thermoelectric effects are very sensitive to the reconstruction of the band structure caused by the Cl O4 anion ordering. © 2006 The American Physical Society.
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Determination of the thermal stability of the fullerene dimers C120, C120O, and C120O2.

J Phys Chem B 110:34 (2006) 16979-16981

Authors:

Jinying Zhang, Kyriakos Porfyrakis, Mark R Sambrook, Arzhang Ardavan, G Andrew D Briggs

Abstract:

We have produced the fullerene dimers C(120), C(120)O, and C(120)O(2) by a high-speed vibration milling technique. The thermal stability of C(120), C(120)O, and C(120)O(2) has been studied in the temperature range 150-350 degrees C for up to 4 h under vacuum. The bridging oxygen atoms were found to substantially increase the stability of the fullerene dimer molecules.
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