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arXiv 0903.0629cond-mat.supr-concond-mat.str-el
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BaT2As2(T = Fe,Co,Ni)单晶及Co掺杂的超导电性

BaT2As2 Single Crystals (T = Fe, Co, Ni) and Superconductivity upon Co-doping

Athena S. Sefat, David J. Singh, Rongying Jin, Michael A. McGuire, Brian C. Sales, Filip Ronning, David Mandrus

摘要:

综述了BaFe_2As_2、BaCo_2As_2和BaNi_2As_2单晶的晶体结构和物理性能。BaFe_2As_2在T_n = 132(1)K时发生磁性和结构转变,BaCo_2As_2是顺磁性金属,而BaNi_2As_2在T_0 = 131 K时发生结构相变,在T_c = 0.69 K以下发生超导。通过电阻率、磁化率和比热数据证明了Co掺杂BaFe2As2在Tc = 22 K以下的体超导电性。与铜酸盐相反,Fe基系统似乎容忍过渡金属层中的相当大的无序。对BaFe_(1.84)Co_(0.16)As_2的第一性原理计算表明Co的带间散射很弱。

英文摘要:

The crystal structure and physical properties of BaFe2As2, BaCo2As2, and BaNi2As2 single crystals are surveyed. BaFe2As2 gives a magnetic and structural transition at TN = 132(1) K, BaCo2As2 is a paramagnetic metal, while BaNi2As2 has a structural phase transition at T0 = 131 K, followed by superconductivity below Tc = 0.69 K. The bulk superconductivity in Co-doped BaFe2As2 below Tc = 22 K is demonstrated by resistivity, magnetic susceptibility, and specific heat data. In contrast to the cuprates, the Fe-based system appears to tolerate considerable disorder in the transition metal layers. First principles calculations for BaFe1.84Co0.16As2 indicate the inter-band scattering due to Co is weak.

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