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Phys Rev Lett. 2008 Nov 7;101(19):197208. Epub 2008 Nov 7.

Probing superexchange interaction in molecular magnets by spin-flip spectroscopy and microscopy.

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Department of Physics, Tsinghua University, Beijing 100084, China.


The superexchange mechanism in cobalt phthalocyanine (CoPc) thin films was studied by a low temperature scanning tunneling microscope. The CoPc molecules were found to form one-dimensional antiferromagnetic chains in the film. Collective spin excitations in individual molecular chains were measured with spin-flip associated inelastic electron tunneling spectroscopy. By spatially mapping the spin-flipping channels with submolecular precision, we are able to explicitly identify the specific molecular orbitals that mediate the superexchange interaction between molecules.

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