標題: Spin-Glass Transition and Giant Paramagnetism in Heavily Hole-Doped Bi2Sr2Co2Oy
作者: Hsu, Hung Chang
Lee, Wei-Li
Lin, Jiunn-Yuan
Young, Ben-Li
Kung, Hsiang-Hsi
Huang, Jian
Chou, Fang Cheng
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 1-二月-2014
摘要: Hole-doped single crystals of misfit-layered cobaltate Bi2-xPbxSr2-zCo2Oy (x = 0-0.61, y = 8.28-8.62, and z = 0.01-0.22) have been successfully grown using the optical floating-zone method. Heavier hole doping has been achieved through both Pb substitution in the Bi site and the more effective Sr vacancy formation. The Co4+ : Co3+ ratio can be raised significantly from its original similar to 1 : 1 to 4.5 : 1, as confirmed by iodometric titration. A spin-glass transition temperature of T-g similar to 70K is confirmed by ac susceptibility measurement when the Co4+ : Co3+ ratio becomes higher than 2 : 1, presumably owing to the significantly increased probability of triangular geometrical frustration among antiferromagnetically coupled localized Co4+ spins.
URI: http://dx.doi.org/10.7566/JPSJ.83.024709
http://hdl.handle.net/11536/23818
ISSN: 0031-9015
DOI: 10.7566/JPSJ.83.024709
期刊: JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume: 83
Issue: 2
結束頁: 
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