Physical properties of ZnCNi3:: comparison with superconducting MgCNi3
Physical properties of ZnCNi3:: comparison with superconducting MgCNi3
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DOI：
10.1088/0953-2048/17/2/007
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发表时间：
2004-02-01
影响因子：
3.6
通讯作者：
Choi, EJ
中科院分区：
文献类型：
--
作者：
Park, MS;Giim, JS;Choi, EJ
我们合成了ZnCNi3，其中Zn取代了超导金属间钙钛矿MgCNi3 （T-c类似于8k）中的Mg。直流电阻率和磁性测量表明，ZnCNi3是顺磁性金属，在2 K以下没有超导现象。此外，尽管两种化合物具有相同的晶格结构和载流子密度，但它们的低温比热却有很大的不同。我们考虑了这些观察的可能起源，并表明在BCS理论中可以理解截然不同的T-c。
We have synthesized ZnCNi3 in which Zn replaces Mg of the superconducting intermetallic perovskite MgCNi3 (T-c similar to 8 K). Dc-resistivity and magnetic measurements show that ZnCNi3 is a paramagnetic metal without onset of superconductivity down to 2 K. Furthermore, even though the two compounds have the same lattice structure and carrier density, their low temperature specific heats are substantially different. We consider possible origins of these observations and show that the strikingly different T-c can be understood within the BCS theory.