Magnetic field-induced changes in the electronic absorption intensities of NENB
- 作者：Long ; V.C. ; Schundler ; E.C. ; Makumbe ; P.O. ; Wei ; X. ; Landee ; C.P. ; Turnbull ; M.M.
- 关键词：78.20.Ls ; NENB ; NENP ; Haldane compound ; Spin glass ; Electronic structure ; Transmittance ; Absorption ; Magnetization
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2004
- 期刊代码：31_03048853
- 类别：ph
- 出版时间：May, 2004
- 卷：272-276
- 期：Part 2
- 页码：968-969
- 文件大小：631 K
摘要
Ni[C2H8N2]2NO2BF4 (NENB) is isostructural to Ni[C2H8N2]2NO2ClO4, a prototypical Haldane compound. We report the polarized optical transmittance of NENB as a function of applied magnetic field (H) up to 30T. Electronic absorption intensities become modified above the critical field (Hc
7.5–10.5T, as determined from weak kinks in the magnetization data). For H>Hc, the intensities of Ni2+ d–d excitations in both polarizations are diminished, whereas the charge transfer transition along the nickel chain is enhanced.
7.5–10.5T, as determined from weak kinks in the magnetization data). For H>Hc, the intensities of Ni2+ d–d excitations in both polarizations are diminished, whereas the charge transfer transition along the nickel chain is enhanced.