Ba(1 - x)Sr(x)Fe(2)As(2)（0 ≤ x ≤ 1）和Ba(1 - x)Sr(x)Fe(1.8)Co(0.2)As(2)（0 ≤ x ≤ 1）的结构和物理性质。
The structural and physical properties of Ba(1-x)Sr(x)Fe(2)As(2) (0 ≤ x ≤ 1) and Ba(1-x)Sr(x)Fe(1.8)Co(0.2)As(2) (0 ≤ x ≤ 1).
作者信息
Wang Zhiwei, Yang Huaixin, Ma Chao, Tian Huanfang, Shi Honglong, Lu Jiangbo, Zeng Lunjie, Li Jianqi
机构信息
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
出版信息
J Phys Condens Matter. 2009 Dec 2;21(49):495701. doi: 10.1088/0953-8984/21/49/495701. Epub 2009 Nov 12.
Polycrystalline samples of Ba(1-x)Sr(x)Fe(2)As(2) (0≤x≤1) and Ba(1-x)Sr(x)Fe(1.8)Co(0.2)As(2) (0≤x≤1) have been synthesized by a solid state reaction method. Structural analysis by means of x-ray diffraction shows that the lattice parameters and unit cell volume decrease monotonically with the increase of x for Ba(1-x)Sr(x)Fe(2)As(2). The measurements of transport properties demonstrate that the average size of the Ba(Sr)-site cations could evidently influence the spin density wave (SDW) behavior in Ba(1-x)Sr(x)Fe(2)As(2) and superconductivity in Ba(1-x)Sr(x)Fe(1.8)Co(0.2)As(2) as well. The critical temperature for SDW (T(SDW)) increases with the Sr substitution for Ba in Ba(1-x)Sr(x)Fe(2)As(2) and, on the other hand, the superconducting T(c) decreases with the increase of Sr content in Ba(1-x)Sr(x)Fe(1.8)Co(0.2)As(2). The inhomogeneous distributions of Ba/Sr ions and structural distortions in Ba(0.5)Sr(0.5)Fe(2)As(2) have been investigated by transmission-electron microscopy (TEM) observations.
采用固态反应法合成了Ba(1-x)Sr(x)Fe(2)As(2)（0≤x≤1）和Ba(1-x)Sr(x)Fe(1.8)Co(0.2)As(2)（0≤x≤1）的多晶样品。通过X射线衍射进行的结构分析表明，对于Ba(1-x)Sr(x)Fe(2)As(2)，晶格参数和晶胞体积随x的增加而单调减小。输运性质的测量表明，Ba(Sr)位阳离子的平均尺寸也会显著影响Ba(1-x)Sr(x)Fe(2)As(2)中的自旋密度波（SDW）行为以及Ba(1-x)Sr(x)Fe(1.8)Co(0.2)As(2)中的超导性。在Ba(1-x)Sr(x)Fe(2)As(2)中，SDW的临界温度（T(SDW)）随Sr取代Ba而升高，而在Ba(1-x)Sr(x)Fe(1.8)Co(0.2)As(2)中，超导转变温度（T(c)）随Sr含量的增加而降低。通过透射电子显微镜（TEM）观察研究了Ba(0.5)Sr(0.5)Fe(2)As(2)中Ba/Sr离子的不均匀分布和结构畸变。
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