Superconductivity at 22 K in Co-doped BaFe2As2 crystals
Superconductivity at 22 K in Co-doped BaFe2As2 crystals
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DOI：
10.1103/physrevlett.101.117004
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发表时间：
2008-09-12
影响因子：
8.6
通讯作者：
Mandrus, David
中科院分区：
文献类型：
--
作者：
Sefat, Athena S.;Jin, Rongying;Mandrus, David
在这里，我们报道了BaFe1.8Co0.2As2单晶在T-c=22K以下的块体超导电性，如电阻率、磁化率和比热数据所证明的。霍尔数据表明，正如简单的化学推理所预期的那样，主要的载流子是电子。这是这一系列材料中第一个由电子掺杂引起的超导电性的例子。与铜酸盐相比，BaFe2As2系统似乎容忍FeAs层中相当大的无序。BaFe1.8Co0.2As2的第一性原理计算表明，Co引起的带间散射很弱。
Here we report bulk superconductivity in BaFe1.8Co0.2As2 single crystals below T-c=22 K, as demonstrated by resistivity, magnetic susceptibility, and specific heat data. Hall data indicate that the dominant carriers are electrons, as expected from simple chemical reasoning. This is the first example of superconductivity induced by electron doping in this family of materials. In contrast with cuprates, the BaFe2As2 system appears to tolerate considerable disorder in the FeAs planes. First principles calculations for BaFe1.8Co0.2As2 indicate the interband scattering due to Co is weak.