Superconductivity in Mo5GeB2 with a tetragonal structure
Superconductivity in Mo5GeB2 with a tetragonal structure
复制标题
四方结构 Mo5GeB2 的超导性
DOI：
10.1088/1361-6668/abdf3e
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
M. Fang
中科院分区：
文献类型：
--
作者：
Binjie Xu;Zhefeng Lou;Huancheng Chen;Yuxing Zhou;Qin Chen;Shuijin Chen;Chun;Hangdong Wang;Jinhu Yang;Jianhua Du;M. Fang
The discovery of 39 K superconductivity in MgB2 and the recent observations of high-T c superconductivity in the high-pressured hydrides motivate ones to search for new superconductors in the compounds containing H or B light element. In this article, we chose the heavier Ge to replace the Si in the ternary borides Mo5SiB2 with the Cr5B3 type tetragonal structure, a relative new group borosilicate superconductors, and prepared Mo5GeB2 polycrystalline sample. By the combination of resistivity, magnetization, and specific heat measurements and band calculations, we determine its superconducting parameters. It was found that Mo5GeB2 is a type II superconductor, with the critical temperature T c = 5.4 K, and the Ginzburg–Landau (GL) parameter k GL (0) = 4.2. The estimated electron-phonon coupling constant λ ph (0.57) and the specific heat jump △Cel/γnTc (1.33) demonstrate that Mo5GeB2 is a weak-coupling, single-gap phonon-mediated superconductor. Band calculations reveal that Mo5GeB2 has a similar density of state (DOS) near Fermi energy to that of Mo5SiB2 with the same T c , but smaller than that Mo5PB2 with T c = 9.2 K.
影响因子：
8.6
作者：
J. Perdew;K. Burke;M. Ernzerhof
通讯作者：
J. Perdew;K. Burke;M. Ernzerhof