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首页> 外文期刊>Physical review >μSR and neutron diffraction investigations on the reentrant ferromagnetic superconductor Eu(Fe_(0.86)Ir_(0.14))_2As_2
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μSR and neutron diffraction investigations on the reentrant ferromagnetic superconductor Eu(Fe_(0.86)Ir_(0.14))_2As_2

机译：折返铁磁超导体Eu（Fe_（0.86）Ir_（0.14））_ 2As_2的μSR和中子衍射研究

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摘要

Results of muon spin relaxation (μSR) and neutron powder diffraction measurements on a reentrant superconductor Eu(Fe_(0.86)Ir_(0.14))_2As_2 are presented. Eu(Fe_(0.86)Ir_(0.14))2As_2 exhibits superconductivity at T_(con) ≈ 22.5 K competing with long range ordered Eu~(+2) moments below ≈18 K. A reentrant behavior (manifested by nonzero resistivity in the temperature range 10-17.5 K) results from an exquisite competition between the superconductivity and magnetic order. The zero field μSR data confirm the long range magnetic ordering below J_(Eu) = 18.7(2) K. The transition temperature is found to increase with increasing magnetic field in longitudinal field μSR which along with the neutron diffraction results, suggests the transition to be ferromagnetic. The neutron diffraction data reveal a clear presence of magnetic Bragg peaks below T_(Eu) which could be indexed with propagation vector k = (0, 0,0), confirming a long range magnetic ordering in agreement with μSR data. Our analysis of the magnetic structure reveals an ordered magnetic moment of 6.29(5) μ_B (at 1.8 K) on the Eu atoms and they form a ferromagnetic structure with moments aligned along the c axis. No change in the magnetic structure is observed in the reentrant or superconducting phases and the magnetic structure remains same for 1.8 K ≤ T ≤ T_(Eu). No clear evidence of structural transition or Fe moment ordering was found.
机译：给出了在重入超导体Eu（Fe_（0.86）Ir_（0.14））_ 2As_2上的μ子自旋弛豫（μSR）和中子粉末衍射测量结果。 Eu（Fe_（0.86）Ir_（0.14））2As_2在T_（con）≈22.5 K时表现出超导性，与≈18K以下的长距离有序Eu〜（+2）矩竞争。回折行为（表现为温度下的非零电阻率）范围是10-17.5 K）是超导和磁序之间的精湛竞争所致。零场μSR数据证实了J_（Eu）= 18.7（2）K以下的长程磁有序。发现转变温度随纵向场μSR中磁场的增加而增加，这与中子衍射结果一起表明向具有铁磁性。中子衍射数据揭示了在T_（Eu）以下清晰可见的布拉格磁峰，可以用传播矢量k =（0，0,0）进行索引，这证实了与μSR数据一致的长距离磁有序性。我们对磁性结构的分析表明，atoms原子上的有序磁矩为6.29（5）μ_B（在1.8 K时），它们形成了一个铁磁结构，其磁矩沿c轴对齐。在折返相或超导相中未观察到磁性结构的变化，并且对于1.8 K≤T≤T_（Eu），磁性结构保持不变。没有发现明显的结构转变或铁矩有序的证据。

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  • 来源
    《Physical review》 |2015年第9期|094427.1-094427.8|共8页
  • 作者

    V. K. Anand; D. T. Adroja; A. Bhattacharyya; U. B. Paramanik; P. Manuel; A. D. Hillier; D. Khalyavin; Z. Hossain;

  • 作者单位

    Helmholtz-Zentrum Berlin fuer Materialien und Energie, Hahn-Meitner Platz 1, D-14109 Berlin, Germany;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom,Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom,Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa;

    Department of Physics, Indian Institute of Technology, Kanpur 208016, India;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom;

    Department of Physics, Indian Institute of Technology, Kanpur 208016, India;

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    other ferromagnetic metals and alloys; muon spin rotation and relaxation;

    机译：其他铁磁金属和合金;介子旋转和松弛;

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