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首页> 外文期刊>Physical review >Evolution of antiferromagnetic susceptibility under uniaxial pressure in Ba(Fe_(1-x)Co_x)_2As_2
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Evolution of antiferromagnetic susceptibility under uniaxial pressure in Ba(Fe_(1-x)Co_x)_2As_2

机译:Ba(Fe_(1-x)Co_x)_2As_2中单轴压力下反铁磁敏感性的演变

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摘要

Neutron diffraction measurements are presented measuring the responses of both magnetic and structural order parameters of parent and lightly Co-doped Ba(Fe_(1-x)Co_r)_2As_2 under the application of uniaxial pressure. We find that the uniaxial pressure induces a thermal shift in the onset of antiferromagnetic order that grows as a percentage of T_N as Co doping is increased and the superconducting phase is approached. Additionally, as uniaxial pressure is increased within parent and lightly doped Ba(Fe_(1-x)Co_x)_2As_2 on the first-order side of the tricritical point, we observe a decoupling between the onsets of the orthorhombic structural distortion and antiferromagnetism. Our findings place needed constraints on models exploring the nematic susceptibility of the bilayer pnictides in the tetragonal, paramagnetic regime.
机译:提出了中子衍射测量,测量了单轴压力下母体和轻度共掺杂的Ba(Fe_(1-x)Co_r)_2As_2的磁性和结构有序参数的响应。我们发现,单轴压力会在反铁磁有序状态下引发热位移,随着Co掺杂的增加和接近超导相,T_N的百分数随T_N的增加而增加。此外,随着三临界点一阶的母体和轻掺杂的Ba(Fe_(1-x)Co_x)_2As_2中单轴压力的增加,我们观察到正交晶系结构畸变和反铁磁性的发作之间存在解耦。我们的发现对模型在双向,顺磁状态下双层肽的向列磁化率的模型施加了约束。

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