Spin transition in Gd3N@C-80, detected by low-temperature on-chip SQUID technique

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American Institute of Physics

We present a magnetic study of the Gd3N@C-80 molecule, consisting of a Gd-trimer via a nitrogen atom, encapsulated in a C-80 cage. This molecular system can be an efficient contrast agent for magnetic resonance imaging (MRI) applications. We used a low-temperature technique able to detect small magnetic signals by placing the sample in the vicinity of an on-chip SQUID. The technique implemented at the National High Magnetic Field Laboratory has the particularity of being able to operate in high magnetic fields of up to 7 T. The Gd3N@C80 shows a paramagnetic behavior and we find a spin transition of the Gd3N structure at 1.2 K. We perform quantum mechanical simulations, which indicate that one of the Gd ions changes from a S-8(7/2) state (L-0, S-7/2) to a F-7(6) state (L-S-3, J-6), likely due to a charge transfer between the C-80 cage and the ion. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3536514]

Superconducting quantum interference devices, Magnetic fields, Magnetic susceptibilities, Josephson junctions, Magnetic resonance imaging
Chen, L., Carpenter, E. E., Hellberg, C. S., Dorn, H. C., Shultz, M., Wernsdorfer, W., Chiorescu, I. (2011). Spin transition in Gd3N@C-80, detected by low-temperature on-chip SQUID technique. Journal of Applied Physics, 109(7). doi: 10.1063/1.3536514