Electronic structure of Co(III) doped bromo-bridged Ni complexes, [Ni1-xCox(chxn)2Br]Br2 |
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Authors: | Xie Jimin Wu Hashen Kawakami Daisuke Iguchi Hiroaki Takaishi Shinya Yamashita Masahiro Matsuzaki Hiroyuki Okamoto Hiroshi Tanaka Hisaaki Kuroda Shin-ichi |
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Institution: | Department of Chemistry, Faculty of Science, Tohoku University & CREST(JST), Aramaki-Aza-Aoba, Sendai 980-8578, Japan. |
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Abstract: | This article describes the electronic structure of the Co(III) doped Br bridged Ni(III) complexes, Ni(1-x)Cox(chxn)2Br]Br2 (x = 0.01, 0.02, 0.05, and 0.11) by using a optical spectroscopy, scanning tunneling microscopy (STM), and electron spin resonance spectroscopy. In the optical reflectivity spectrum, the new band was formed at about 0.5 eV, which is reasonably recognized as the d(z2) band of doped Co(III) ions. In the STM images of Ni(1-x)Cox(chxn)2Br]Br2, the bright spots attributable to the tunnel current from the Fermi level of the STM tip to the conduction band of the sample were observed. In addition, some brighter spots were also observed. Because the number of the brighter spots is in good agreement with that of doped Co species, the brighter spots can be assigned to doped Co(III) sites. These are reasonably explained by the tunnel current from the Fermi level of the tip to the d(z2) band of Co(III). The Curie spin concentration was gradually increased with increasing Co(III) ions, which is explained by the scissions of the S = 1/2 1D antiferromagnetic chains. |
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