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Phys. Rev. Lett. 100, 147602 (2008) [4 pages]

Antiferromagnetic d-Electron Exchange via a Spin-Singlet π-Electron Ground State in an Organic Conductor

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T. Tokumoto1,2, J. S. Brooks1,2, Y. Oshima3, E. S. Choi1, L. C. Brunel1,2, H. Akutsu4, T. Kaihatsu4, J. Yamada4, and J. van Tol1,5
1National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
2Department of Physics, Florida State University, Tallahassee, Florida 32306-4350, USA
3Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan
4Department of Material Science, Graduate School of Material Science, University of Hyogo, Hyogo 678-1297, Japan
5Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, USA

Received 28 August 2007; published 10 April 2008

Electron spin resonance reveals the spin behavior of conduction (π) and localized (d) electrons in β-(BDA-TTP)2MCl4 (M=Fe, Ga). Both the Ga3+(S=0) and Fe3+(S=5/2) compounds exhibit a metal-insulator transition at 113 K with the simultaneous formation of a spin-singlet ground state in the π electron system of the donor molecules. The behavior is consistent with charge ordering in β-(BDA-TTP)2MCl4 at the metal-insulator transition. At 5 K, the Fe3+ compound orders antiferromagnetically, even though the π electrons, which normally would facilitate magnetic exchange, are localized nonmagnetic singlets.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.147602
DOI:
10.1103/PhysRevLett.100.147602
PACS:
76.30.−v, 71.20.Rv, 76.50.+g
 
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