Superconductivity in LaBi3 with AuCu3-type structure
Superconductivity in LaBi3 with AuCu3-type structure
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DOI：
10.1088/0953-2048/29/3/03lt02
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发表时间：
2016-02
影响因子：
3.6
通讯作者：
T. Kinjo;Saori Kajino;T. Nishio;K. Kawashima;Y. Yanagi;I. Hase;T. Yanagisawa;S. Ishida;H. Kitô;N. Takeshita;K. Oka;H. Eisaki;Y. Yoshida;A. Iyo
中科院分区：
文献类型：
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作者：
T. Kinjo;Saori Kajino;T. Nishio;K. Kawashima;Y. Yanagi;I. Hase;T. Yanagisawa;S. Ishida;H. Kitô;N. Takeshita;K. Oka;H. Eisaki;Y. Yoshida;A. Iyo
我们利用高压技术成功地合成了一种具有AuCu3型结构的新型金属间化合物LaBi3。在450℃、3.4 Gpa压力下反应生成LaBi3，a轴晶胞参数为4.99±0.02；在7.3K~7.4K温度范围内，其磁化率和电阻率都发生了明显的夏普相变，其上临界场0H2(0)和金兹堡-朗道相干长度ξ分别为1.70T和139A。超导转变温度T_c随外加压力的增加而线性下降，斜率为−0.26K Gpa−_1。能带结构计算表明，该化合物具有多带性质，其费米能正好位于其中一个峰态密度。
We succeeded in synthesizing a new intermetallic compound with a AuCu3-type structure, LaBi3, by utilizing a high-pressure technique. Reacting Bi and LaBi at 450 °C under a pressure of 3.4 GPa resulted in the crystallization of LaBi3 with an a-axis lattice parameter of 4.99 ± 0.02 Å. ?> Sharp superconducting transitions were observed in both its magnetic susceptibility and electrical resistivity at 7.3–7.4 K. The upper critical field 0 H c 2 ( 0 ) ?> and Ginzburg–Landau coherence length ξ0 were estimated to be 1.70 T and 139 Å, respectively. The superconducting transition temperature Tc was found to decrease linearly with increasing applied pressure with a slope of −0.26 K GPa−1. Band structure calculations indicated that this compound has a multiband nature and that its Fermi energy is located exactly at one of the peak density of states.