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

✍ Scribed by Reinhard K. Kremer; Basil Kanellakopulos; Petra Bele; Hermann Brunner; Franz A. Neugebauer

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 431 KB
• Volume: 230
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)01137-0

✦ Synopsis

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 -' and a Weiss constant of -12 (2) K. At low temperature we find 1 D 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.