| Autor: |
Chen, L., Carpenter, E. E., Hellberg, C. S., Dorn, H. C., Shultz, M., Wernsdorfer, W., Chiorescu, I. |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
J. Appl. Phys., Vol 109, 07B101, 2011 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1063/1.3536514 |
| Popis: |
We present a magnetic study of the Gd$_3$N@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 NHMFL has the particularity to operate in high magnetic fields of up to 7 T. The Gd$_3$N@C$_{80}$ shows a paramagnetic behavior and we find a spin transition of the Gd$_3$N structure at 1.2 K. We perform quantum mechanical simulations, which indicate that one of the Gd ions changes from a $^8S_{7/2}$ state ($L=0, S=7/2$) to a $^7F_{6}$ state ($L=S=3, J=6$), likely due to a charge transfer between the C$_{80}$ cage and the ion. |
| Databáze: |
arXiv |
| Externí odkaz: |
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