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首页> 外文期刊>Physical review >Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu_2Si_2
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Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu_2Si_2

机译:相称和不相称的低能激发在URu_2Si_2的顺磁至隐序跃迁中的作用

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摘要

We report low-energy inelastic neutron scattering data of the paramagnetic (PM) to hidden-order (HO) phase transition at T_0 = 17.5 K in URu_2Si_2. While confirming previous results for the HO and PM phases, our data reveal a pronounced wave-vector dependence of low-energy excitations across the phase transition. To analyze the energy scans we employ a damped harmonic oscillator model containing a fit parameter 1/Γ which is expected to diverge at a second-order phase transition. Counter to expectations the excitations at Q_1 ≈ (1.4,0,0) show an abrupt steplike suppression of 1/Γ below T_0, whereas excitations at Q_0 = (1,0,0), associated with large-moment antiferromagnetism (LMAF) under pressure, show an enhancement and a pronounced peak of 1/Γ at T_0. Therefore, at the critical HO temperature T_0, LMAF fluctuations become nearly critical as well. This is the behavior expected of a "supervector" order parameter with nearly degenerate components for the HO and LMAF leading to nearly isotropic fluctuations in the combined order-parameter space.
机译:我们报告了在URu_2Si_2中,T_0 = 17.5 K时顺磁(PM)到隐蔽(HO)相变的低能非弹性中子散射数据。在确认HO和PM相的先前结果时,我们的数据揭示了整个相变过程中低能量激发的明显的波矢量依赖性。为了分析能量扫描,我们采用了阻尼谐波振荡器模型,该模型包含一个拟合参数1 /Γ,该参数有望在二阶相变处发散。与预期相反,在Q_1≈(1.4,0,0)处的激励显示出在T_0以下突然抑制了1 /Γ的阶梯状抑制,而在Q_0 =(1,0,0)处的激励与在以下条件下的大力矩反铁磁性(LMAF)相关压力显示出增强,在T_0处有一个1 /Γ的峰值。因此,在临界HO温度T_0时,LMAF波动也变得几乎临界。这是具有对HO和LMAF几乎简并的分量的“超向量”阶数参数的预期行为,从而导致组合阶数参数空间中几乎各向同性的波动。

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  • 来源
    《Physical review》 |2015年第11期|115116.1-115116.6|共6页
  • 作者单位

    Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, United Kingdom;

    Center for Emergent Materials, Ohio State University, Columbus, Ohio 43210, USA;

    Physik Department, Technische Universitaet Muenchen, 85748 Garching, Germany;

    Heinz Maier-Leibnitz Zentrum, Technische Universitaet Muenchen, Lichtenbergstrasse 1, 85748 Garching, Germany;

    Juelich Centre for Neutron Science at Heinz Maier-Leibnitz Zentrum, Forschungszentrum Juelich GmbH, Lichtenbergstrasse 1, 85748 Garching, Germany;

    Heinz Maier-Leibnitz Zentrum, Technische Universitaet Muenchen, Lichtenbergstrasse 1, 85748 Garching, Germany;

    Institut fuer Theoretische Physik, Technische Universitaet Dresden, 01062 Dresden, Germany;

    Van der Waals-Zeeman Institute, University of Amsterdam, 1018XE Amsterdam, Netherlands;

    Kamerlingh Onnes Laboratory, Leiden University, 2300RA Leiden, Netherlands;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    strongly correlated electron systems; heavy fermions; magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.);

    机译:强相关电子系统;重费米子磁相边界(包括磁跃迁;超磁性等);

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