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Continuous magnetic phase transition in artificial square ice

机译：人造方冰中的连续磁相变

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摘要

Critical behavior is very common in many fields of science and a wide variety of many-body systems exhibit emergent critical phenomena. The beauty of critical phase transitions lies in their scale-free properties, such that the temperature dependence of physical parameters of systems differing at the microscopic scale can be described by the same generic power laws. In this work we establish the critical properties of the antiferromagnetic phase transition in artificial square ice, showing that it belongs to the two-dimensional Ising universality class, which extends the applicability of such concepts from atomistic to mesoscopic magnets. Combining soft x-ray resonant magnetic scattering experiments and Monte Carlo simulations, we characterize the transition to the low-temperature long-range order expected for the artificial square-ice system. By measuring the critical scattering, we provide direct quantitative evidence of a continuous magnetic phase transition, obtaining critical exponents which are compatible with those of the two-dimensional Ising universality class. In addition, by varying the blocking temperature relative to the phase transition temperature, we demonstrate its influence on the out-of-equilibrium dynamics due to critical slowing down at the phase transition.
机译：批判行为在许多科学领域中非常普遍，各种各样的多体系统都表现出紧急的批判现象。关键相变的美在于它们的无标度特性，因此可以用相同的通用幂定律描述微观尺度上不同的系统物理参数对温度的依赖性。在这项工作中，我们建立了人造方冰中反铁磁相变的临界性质，表明它属于二维Ising通用性类，从而将此类概念的适用性从原子磁体扩展到介观磁体。结合软X射线共振磁散射实验和蒙特卡洛模拟，我们表征了向人工方冰系统预期的低温远距离有序过渡的特征。通过测量临界散射，我们提供了连续磁相变的直接定量证据，获得了与二维Ising通用性类兼容的临界指数。另外，通过改变相对于相变温度的阻断温度，我们证明了由于相变临界减慢其对失衡动力学的影响。

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  • 来源
    《Physical review》 |2019年第21期|214430.1-214430.11|共11页
  • 作者

    Sendetskyi Oles; Scagnoli Valerio; Leo Naemi; Anghinolfi Luca; Alberca Aurora; Luening Jan; Staub Urs; Derlet Peter Michael; Heyderman Laura Jane;

  • 作者单位

    Swiss Fed Inst Technol, Dept Mat, Lab Mesoscop Syst, CH-8093 Zurich, Switzerland|Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland;

    Swiss Fed Inst Technol, Dept Mat, Lab Mesoscop Syst, CH-8093 Zurich, Switzerland|Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland;

    Swiss Fed Inst Technol, Dept Mat, Lab Mesoscop Syst, CH-8093 Zurich, Switzerland|Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland;

    Swiss Fed Inst Technol, Dept Mat, Lab Mesoscop Syst, CH-8093 Zurich, Switzerland|Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland|Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland;

    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland|Univ Fribourg, Dept Phys, Chemin Musee 3, CH-1700 Fribourg, Switzerland|Univ Fribourg, Fribourg Ctr Nanomat, Chemin Musee 3, CH-1700 Fribourg, Switzerland;

    UPMC, Univ Paris 06, Sorbonne Univ, UMR 7614,LCPMR, F-75005 Paris, France|CNRS, UMR 7614, LCPMR, F-75005 Paris, France;

    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland;

    Paul Scherrer Inst, Condensed Matter Theory Grp, CH-5232 Villigen, Switzerland;

    Swiss Fed Inst Technol, Dept Mat, Lab Mesoscop Syst, CH-8093 Zurich, Switzerland|Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland;

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