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Pressure-tuned superconductivity and normal-state behavior in Ba(Fe_(0.943)Co_(0.057))_2As_2 near the antiferromagnetic boundary

机译:反铁磁边界附近Ba(Fe_(0.943)Co_(0.057))_ 2As_2中压力调节的超导性和常态行为

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摘要

Superconductivity in iron pnictides is unconventional and pairing may be mediated by magnetic fluctuations in the Fe sublattice. Pressure is a clean method to explore superconductivity in iron based superconductors by tuning the ground state continuously without introducing disorder. Here we present a systematic high pressure transport study in Ba(Fe_(1-x)Co_x)_2As_2 single crystals with x =0.057, which is near the antiferromagnetic instability. Resistivity ρ = ρo + AT~n was studied under applied pressure up to 7.90 GPa. The parameter n approaches a minimum value of n ≈ 1 at a critical pressure P_c = 3.65 GPa. Near P,.. the superconducting transition temperature T_c reaches a maximum value of 25.8 K. In addition, the superconducting diamagnetism at 2 K shows a sudden chage around the same critical pressure. These results may be associated with a possible quantum critical point hidden inside the superconducting dome, near optimum T_c.
机译:铁素化物中的超导性是非常规的,并且配对可能由Fe亚晶格中的磁涨落来介导。压力是一种通过连续调整基态而不引入无序现象来探索铁基超导体中超导性的干净方法。在这里,我们对x = 0.057的Ba(Fe_(1-x)Co_x)_2As_2单晶进行了系统的高压输运研究,这接近反铁磁不稳定性。在高达7.90 GPa的施加压力下研究了电阻率ρ=ρo+ AT〜n。在临界压力P_c = 3.65 GPa时,参数n接近最小值n≈1。在P附近,超导转变温度T_c达到最大值25.8K。此外,在2K下的超导抗磁性在相同的临界压力附近显示出突然的变化。这些结果可能与隐藏在超导圆顶内,接近最佳T_c的可能的量子临界点有关。

著录项

  • 来源
    《Physical review》 |2018年第14期|776-780|共5页
  • 作者单位

    Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China,Departrnent of Physics, Zhejiang SCI-TECH University, Hangzhou, 310018 China;

    State Key Laboratory of Functional Materials for Informatics. Shanghai Institute of Microsystem and Information Technology. Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China,University of Chinese Academy of Science, Beijing 100049. China;

    Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China;

    Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011. USA;

    Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011. USA;

    Division of Plrysics and Applied Physics. School of Physical and Mathematical Sciences, Nanyang Technological University,637371 Singapore;

    Departrnent of Physics, Zhejiang SCI-TECH University, Hangzhou, 310018 China;

    State Key Laboratory of Functional Materials for Informatics. Shanghai Institute of Microsystem and Information Technology. Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China;

    State Key Laboratory of Functional Materials for Informatics. Shanghai Institute of Microsystem and Information Technology. Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China;

    Department of Physics, Kent State University, Kent, Ohio 44242, USA;

    Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China;

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  • 关键词

    144515.1-144515.5;

    机译:144515.1-144515.5;

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