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HfFeGa_2 and HfMnGa_2: Transition-metal-based itinerant ferromagnets with low Curie temperatures

机译:HfFeGa_2和HfMnGa_2:居里温度低的过渡金属基巡回铁磁体

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摘要

We present a report on the physical properties of the transition-metal-based ferromagnets HfFeGa_2 and HfMnGa_2. The magnetic susceptibility in both displays Curie-Weiss behavior at high temperature that is replaced by the critical susceptibility just above the Curie temperatures, which are 47.9 K in HfFeGa_2 and 25.6 K in HfMnGa_2. The ferromagnetically ordered state has a coercive field of 1700 Oe in HfFeGa_2 and 320 Oe in HfMnGa_2, with strong anisotropy that largely confines the moments to the b axis. Critical exponents that are derived from neutron diffraction measurements and Arrott plot analyses of the magnetization confirm the mean-field character of the ferromagnetic transitions. Phonons dominate the specific heat at all temperatures, but clear ordering anomalies accompany the onset of ferromagnetic order, as well as an electronic component that is larger in the ordered than paramagnetic states. Both HfFeGa_2 and HfMnGa_2 are metallic, and we observe an anomalous exponent in the temperature-dependent resistivity p(T), where p(T) - p0 = BT~(5/3), signaling that the ordered state is a marginal Fermi liquid. Overall, the robustness of ferromagnetic order, the Curie temperatures, and the impact of fluctuations in both HfFeGa_2 and HfMnGa_2 are very similar to those of previously studied ferromagnets, such as MnSi, ZrZn_2, Ni_3Al, and Sc_3ln.
机译:我们提出了基于过渡金属的铁磁体HfFeGa_2和HfMnGa_2的物理性能的报告。两者的磁化率在高温下均显示居里-魏斯行为,被居里温度正上方的临界磁化率所替代,居里温度在HfFeGa_2中为47.9 K,在HfMnGa_2中为25.6K。铁磁有序状态在HfFeGa_2中具有1700 Oe的矫顽场,在HfMnGa_2中具有320 Oe的矫顽场,具有强的各向异性,极大地将矩限制在b轴上。从中子衍射测量和磁化的Arrott图分析得出的关键指数证实了铁磁跃迁的平均场特性。声子在所有温度下都占据着比热的主导地位,但是清晰的有序异常伴随着铁磁有序的出现,以及电子元素的有序性比顺磁态更大。 HfFeGa_2和HfMnGa_2均为金属,我们观察到与温度相关的电阻率p(T)的反常指数,其中p(T)-p0 = BT〜(5/3),表明有序状态是边际费米液体。总体而言,铁磁序的鲁棒性,居里温度以及HfFeGa_2和HfMnGa_2的波动影响与先前研究的铁磁体(如MnSi,ZrZn_2,Ni_3Al和Sc_3ln)非常相似。

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  • 来源
    《Physical review》 |2011年第18期|p.184435.1-184435.9|共9页
  • 作者单位

    Brookhaven National Laboratory, Upton, New York 11973, USA,Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA;

    Brookhaven National Laboratory, Upton, New York 11973, USA;

    Brookhaven National Laboratory, Upton, New York 11973, USA,Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA;

    Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA;

    Brookhaven National Laboratory, Upton, New York 11973, USA,Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA;

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  • 正文语种 eng
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  • 关键词

    magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); critical-point effects, specific heats, short-range order; other ferromagnetic metals and alloys;

    机译:磁相边界(包括磁跃迁;超磁性等);临界点效应;比热;短程顺序;其他铁磁金属和合金;

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