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首页> 外文期刊>Physical review >Universal critical behavior in the ferromagnetic superconductor Eu(Fe_(0.75) Ru_(0.25))_2As_2
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Universal critical behavior in the ferromagnetic superconductor Eu(Fe_(0.75) Ru_(0.25))_2As_2

机译：铁磁超导体Eu（Fe_（0.75）Ru_（0.25））_ 2As_2中的普遍临界行为

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摘要

The study of universal critical behavior is a crucial issue in a continuous phase transition, which groups various critical phenomena into universality classes for revealing microscopic electronic behaviors. The understanding of the nature of magnetism in Eu-based ferromagnetic superconductors is largely impeded by the infeasibility of performing inelastic neutron scattering measurements to deduce the microscopic magnetic behaviors and the effects on the superconductivity, due to the significant neutron absorption effect of natural Eu-152 and unavailability of large single crystals. However, by systematically combining the neutron diffraction experiment, the first-principles calculations, and the quantum Monte Carlo simulations, we have obtained a perfectly consistent universal critical exponent value of beta = 0.385(13) experimentally and theoretically for Eu(Fe0.75Ru0.25)(2)As-2, from which the magnetism in the Eu-based ferromagnetic superconductors is identified as the universal class of a three-dimensional anisotropic quantum Heisenberg model with long-range magnetic exchange coupling. This systematic study points out a suitable microscopic theoretical model for describing the nature of magnetism in the intriguing Eu-based ferromagnetic superconductors.
机译：普遍临界行为的研究是连续相变中的关键问题，该阶段将各种临界现象归纳为揭示微观电子行为的普遍性类别。由于天然Eu-152具有显着的中子吸收作用，因此无法进行非弹性中子散射测量以推断微观磁行为以及对超导性的影响，这极大地阻碍了对Eu基铁磁超导体中磁性性质的理解。和大型单晶的可用性。然而，通过系统地结合中子衍射实验，第一性原理计算和量子蒙特卡洛模拟，我们在实验和理论上获得了Eu（Fe0.75Ru0）的β= 0.385（13）的完全一致的通用临界指数值。 25）（2）As-2，由此可以将Eu基铁磁超导体中的磁性确定为具有长距离磁交换耦合的三维各向异性量子Heisenberg模型的通用类。这项系统的研究指出了一个合适的微观理论模型，用于描述有趣的Eu基铁磁超导体中的磁性。

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  • 来源
    《Physical review》 |2019年第6期|60406.1-60406.6|共6页
  • 作者

    Zhou Zheng; Jin W. T.; Li Wei; Nandi S.; Ouladdiaf B.; Yan Zheng; Wei Xinyuan; Xu Xuguang; Jiao W. H.; Qureshi N.; Xiao Y.; Su Y.; Cao G. H.; Bruckel Th;

  • 作者单位

    Fudan Univ State Key Lab Surface Phys Shanghai 200433 Peoples R China|Fudan Univ Dept Phys Shanghai 200433 Peoples R China;

    Forschungszentrum Julich JCNS Heinz Maier Leibnitz Zentrum MLZ Lichtenbergstr 1 D-85747 Garching Germany;

    Fudan Univ State Key Lab Surface Phys Shanghai 200433 Peoples R China|Fudan Univ Dept Phys Shanghai 200433 Peoples R China|Collaborat Innovat Ctr Adv Microstruct Nanjing 210093 Jiangsu Peoples R China;

    Forschungszentrum Julich JCNS D-52425 Julich Germany|Forschungszentrum Julich PGI JARA FIT D-52425 Julich Germany;

    Inst Laue Langevin 71 Rue Martyrs Boite Postale 156 F-38042 Grenoble 9 France;

    ShanghaiTech Univ Sch Phys Sci & Technol Shanghai 201210 Peoples R China;

    Zhejiang Univ Sci & Technol Sch Sci Hangzhou 310023 Zhejiang Peoples R China;

    Peking Univ Sch Adv Mat Shenzhen Grad Sch Shenzhen 518055 Peoples R China;

    Zhejiang Univ Dept Phys Hangzhou 310027 Zhejiang Peoples R China;

    Forschungszentrum Julich JCNS Heinz Maier Leibnitz Zentrum MLZ Lichtenbergstr 1 D-85747 Garching Germany|Forschungszentrum Julich JCNS D-52425 Julich Germany|Forschungszentrum Julich PGI JARA FIT D-52425 Julich Germany;

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