Quadrupole Effects of Layered Iron Pnictide Superconductor Ba(Fe0.9Co0.1)2As2
Quadrupole Effects of Layered Iron Pnictide Superconductor Ba(Fe0.9Co0.1)2As2
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DOI：
10.1143/jpsj.80.073702
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发表时间：
2011-07-01
影响因子：
1.7
通讯作者：
Sato, Masatoshi
中科院分区：
文献类型：
--
作者：
Goto, Terutaka;Kurihara, Ryosuke;Sato, Masatoshi
用超声脉冲回波法测量了最佳超导转变温度为23 K的铁磷属元素化物Ba（Fe_（0.9）Co_（0.1））（2）As-2的弹性常数。C-66的剪切弹性常数随弹性应变ε（xy）的变化在300 K以下软化21%，并在超导相开始增大，而C-44和（C-11 -C-12）/2的剪切弹性常数在80 K以下软化至4.2 K时没有软化的迹象。简并d（y 'z）和d（zx'）带中的电四极O-v'参与了铁磷属元素体系的超导电性。
Elastic constant measurements on iron pnictide Ba(Fe0.9Co0.1)(2)As-2 with an optimal superconducting transition temperature of T-SC = 23 K have been performed by the ultrasonic pulse echo method. The shear elastic constant of C-66 associated with elastic strain epsilon(xy) reveals considerable softening of 21% below 300 K down to T-SC and becomes increasing in the superconducting phase below T-SC, while other shear elastic constants of (C-11 -C-12)/2 and C-44 show no sign of softening below 80 K down to 4.2 K. The electric quadrupole O-v' existing in the degenerate d(y'z) and d(zx') bands participates in the superconductivity of the present iron pnictide system.