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Weak magnetic transitions in pyrochlore Bi_2Ir_2O_7

机译：烧绿石Bi_2Ir_2O_7中的弱磁跃迁

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摘要

Muon spin relaxation measurements on Bi_2Ir_2O_7 show that it undergoes a bulk magnetic transition at 1.84(3) K.This is accompanied by increases in the muon spin relaxation rate and the amplitude of the nonrelaxing part of the signal.The magnetic field experienced by muons is estimated to be 0.7 mT at low temperature, around two orders of magnitude smaller than that in other pyrochlore iridates.These results suggest that the low-temperature state represents static magnetism of exceptionally small magnetic moments,～0.01μB/Ir.The relaxation rate increases further below 0.23(4) K, coincident with an upturn in the specific heat, suggesting the existence of a second low-temperature magnetic transition.
机译：在Bi_2Ir_2O_7上进行的μ子自旋弛豫测量表明，它在1.84（3）K处经历了体磁跃迁，伴随着μ子自旋弛豫率的增加和信号的非松弛部分的振幅的增加。估计在低温下为0.7 mT，比其他烧绿石铱酸盐小约两个数量级。这些结果表明，低温状态代表具有极小磁矩的静磁，约为0.01μB/ Ir，弛豫率增加进一步低于0.23（4）K，这与比热的上升相吻合，表明存在第二个低温磁性跃迁。

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  • 来源
    《Physical review》 |2013年第18期|180409.1-180409.5|共5页
  • 作者

    P.J.Baker; J.S.Moeller; F.L.Pratt; W.Hayes; S.J.Blundell; T.Lancaster; T.F.Qi; G.Cao;

  • 作者单位

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

    Oxford University Department of Physics,Clarendon Laboratory, Parks Road, Oxford 0X1 3PU, United Kingdom;

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

    Oxford University Department of Physics,Clarendon Laboratory, Parks Road, Oxford 0X1 3PU, United Kingdom;

    Oxford University Department of Physics,Clarendon Laboratory, Parks Road, Oxford 0X1 3PU, United Kingdom;

    University of Durham, Centre for Materials Physics,South Road, Durham,DH1 3LE,United Kingdom;

    Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA;

    Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA;

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  • 正文语种 eng
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  • 关键词

    muon spin rotation and relaxation; antiferromagnetics; manganites;

    机译：介子旋转和松弛;反铁磁锰矿;

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