Effects of uniaxial pressure and annealing on the resistivity of Ba(Fe_<1-x>Co_x)_2As
Effects of uniaxial pressure and annealing on the resistivity of Ba(Fe_<1-x>Co_x)_2As
复制标题
单轴压力和退火对Ba(Fe_<1-x>Co_x)_2As电阻率的影响
DOI：
10.1016/j.jpcs.2010.10.080
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
T.Liang;M.Nakajima;et al
通过施加单轴压力，确定了欠掺杂Ba(Fe1−xCox) 2as2的单晶。在不释放压力的情况下，采用Montgomery法测量各向异性面内电阻率。沿着a轴的电阻率在5K以下表现为金属行为，而沿着b轴的电阻率在某些温度范围内表现为绝缘体样行为。样品在x=0时的残余电阻率从根本上降低，同时各向异性在低温下变小。
Single crystals of underdoped Ba(Fe1−xCox)2As2were detwinned by applying uniaxial pressure. The anisotropic in-plane resistivity was measured using the Montgomery method without releasing pressure. The resistivity along the a-axis shows metallic behavior down to 5K, while the resistivity along the b-axis shows an insulator-like behavior in some temperature range. Annealing the sample radically reduces the residual resistivity for x=0, and at the same time the anisotropy becomes much smaller at low temperatures.