Recent high field ESR studies of low-dimensional quantum spin systems in Kobe

✍ Scribed by Hitoshi Ohta; Susumu Okubo; Yuji Inagaki; Zenji Hiroi; Hikomitsu Kikuchi

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 783 KB
• Volume: 346-347
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2004.01.016

✦ Synopsis

Recent advances in the high-field ESR studies of low-dimensional quantum spin systems in Kobe are presented. Among many systems studied, the results of S ¼ 1 2 quasi-one-dimensional (1D) antiferromagnet BaCu 2 ðSi 1Àx Ge x Þ 2 O 7 with the staggered field and S ¼ 1 2 diamond chain system Cu 3 OH 2 ðCO 3 Þ 2 are discussed. As the interchain interaction is almost canceled in the BaCu 2 ðSi 1Àx Ge x Þ 2 O 7 (x ¼ 0:65) system, we have found that the field and temperature dependences of the linewidth and the resonance field obey the Oshikawa-Affleck (OA) ESR theory of 1D antiferromagnet. The effect of the interchain interaction from the x dependence measurement and the existence of the breather mode at low temperature are also discussed. On the other hand, the high-field ESR measurements at 1:8 K revealed the direct transition in Cu 3 OH 2 ðCO 3 Þ 2 : The direct transition turned out to be anisotropic and it will be discussed in connection with the 1 3 magnetization plateau which is also anisotropic.