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Yb_2Sn_2O_7: A magnetic Coulomb liquid at a quantum critical point

机译:Yb_2Sn_2O_7:处于量子临界点的库仑磁性液体

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摘要

We report neutron scattering and ac susceptibility measurements on the pyrochlore Yb_2Sn_2O_7. The appearance of magnetic diffuse scattering, low-energy spin excitations, and a nearly temperature-independent relaxation time are signatures that the system enters a short-range-ordered regime with quantum dynamics beneath 2 K. ac susceptibility data further suggest that Yb_2Sn_2O_7 enters a long-range magnetically ordered state below 0.11 K. These results suggest that Yb_2Sn_2O_7 is a ferromagnet with persistent spin dynamics down to 0.05 K. Referencing the phase diagram for Yb pyrochlores, Yb_2Sn_2O_7 is approaching a quantum phase transition near the ferromagnetic ordered critical point.
机译:我们报告了烧绿石Yb_2Sn_2O_7的中子散射和磁化率测量。磁扩散散射的出现,低能量的自旋激发和几乎与温度无关的弛豫时间是系统进入具有2 K以下量子动力学的短程有序状态的标志。交流磁化率数据进一步表明Yb_2Sn_2O_7进入了低于0.11 K的长程磁有序状态。这些结果表明Yb_2Sn_2O_7是具有低至0.05 K的持久自旋动力学的铁磁体。参考Yb烧绿石的相图,Yb_2Sn_2O_7正在接近铁磁有序临界点的量子相变。

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  • 来源
    《Physical review》 |2013年第13期|134408.1-134408.5|共5页
  • 作者单位

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA;

    National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA;

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA,National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA;

    Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada R3T2N2;

    Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada R3T2N2;

    NIST Center for Neutron Research, Gaithersburg, Maryland, 20899-6102, USA,Department of Materials Science and Engineering, University of Maryland, College Park, Maryland, 20742, USA;

    NIST Center for Neutron Research, Gaithersburg, Maryland, 20899-6102, USA;

    NIST Center for Neutron Research, Gaithersburg, Maryland, 20899-6102, USA,Indiana University, 2401 Milo B. Sampson Lane, Bloomington, Indiana 47408, USA;

    National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA,Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada R3T2N2,Department of Chemistry, University of Winnipeg, Winnipeg, Manitoba, Canada R3B 2E9;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.); spin glasses and other random magnets; neutron inelastic scattering;

    机译:动态特性(动态磁化率;自旋波;自旋扩散;动态缩放等);旋转眼镜和其他随机磁铁;中子非弹性散射;

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