Virginia Tech. Department of ChemistryFlorida State University. Department of PhysicsNational High Magnetic Field LaboratoryVirginia Commonwealth University. Department of ChemistryNaval Research Laboratory (U.S.). Center for Computational Materials ScienceInstitut Neel, associe a l’UJF, CNRSChen, L.Carpenter, Everett E.Hellberg, Carl S.Dorn, Harry C.Shultz, Michael D.Wernsdorfer, WolfgangChiorescu, Irinel2015-05-052015-05-052011-04-01Chen, 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: 10.1063/1.35365140021-8979http://hdl.handle.net/10919/52021We 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]4 pagesapplication/pdfen-USIn CopyrightSuperconducting quantum interference devicesMagnetic fieldsMagnetic susceptibilitiesJosephson junctionsMagnetic resonance imagingArticle - Refereedhttp://scitation.aip.org/content/aip/journal/jap/109/7/10.1063/1.3536514https://doi.org/10.1063/1.3536514