Ba2CoO4 : Crystal growth, structure refinement, and physical properties (
Ba2CoO4 : Crystal growth, structure refinement, and physical properties (
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DOI：
10.1103/physrevb.73.174404
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发表时间：
2006-05
影响因子：
3.7
通讯作者：
R. Jin;H. Sha;P. Khalifah;R. Sykora;B. Sales;D. Mandrus;Jiandi Zhang
中科院分区：
文献类型：
--
作者：
R. Jin;H. Sha;P. Khalifah;R. Sykora;B. Sales;D. Mandrus;Jiandi Zhang
Single-crystalline Ba{sub 2}CoO{sub 4} was grown using the floating-zone technique. Single-crystal refinement of x-ray diffraction data indicates that Ba{sub 2}CoO{sub 4} has a monoclinic structure with a = 5.9176(13) {angstrom}, b = 7.6192(16) {angstrom}, c = 10.3790(22) {angstrom}, and {beta} = 91.734(4){sup o} at room temperature. Magnetic susceptibility, specific heat, and thermal conductivity show anomalies at T{sub N} = 25 K, due to antiferromagnetic ordering. However, the magnitude of the Neel temperature T{sub N} is significantly lower than the Curie-Weiss temperature (|{Theta}| {approx} 110 K), suggesting either reduced-dimensional magnetic interactions and/or the existence of magnetic frustration. The latter may be induced by disorder evident from the variable-range-hopping behavior in the electrical resistivity, nonzero T term in the specific heat, and T{sup 2} dependence in the thermal conductivity at low temperatures.
