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Weak ferromagnetism and magnetically modulated microwave absorption at low magnetic fields in 1,3,5-triphenyl-6-oxoverdazyl

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Bele,  Petra
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Neugebauer,  Franz A.
Department of Organic Chemistry, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Kremer, R. K., Kanellakopulos, B., Bele, P., Brunner, H., & Neugebauer, F. A. (1994). Weak ferromagnetism and magnetically modulated microwave absorption at low magnetic fields in 1,3,5-triphenyl-6-oxoverdazyl. Chemical Physics Letters, 230(3), 255-259. doi:10.1016/0009-2614(94)01137-0.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-A89F-8
Abstract
The magnetic susceptibility and microwave properties of powder samples of 1,3,5-triphenyl-6-oxoverdazyl were investigated between room temperature and 1.8 K. The high-temperature susceptibility follows a Curie-Weiss law with a Curie constant of 0.38(1) emu K mol−1 and a Weiss constant of −12(2) K. At low temperature we find 1D magnetic behaviour evidenced by a broad maximum in the susceptibility. Below 4.9 K weak ferromagnetism is detected which is attributed to a canting of the antiferromagnetic sublattices of about 0.13°. Strong nonresonant microwave absorption appears below 4 K which exhibits a hysteresis when measured in a small scanned external field. Possible origins of the weak ferromagnetism and the nonresonant microwave absorption are discussed.