Search for quantum criticality in a ferromagnetic system UNi_(1-x)Co_xSi_2

A. P. Pikul; D. Kaczorowski

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Search for quantum criticality in a ferromagnetic system UNi_(1-x)Co_xSi_2

机译：在铁磁系统UNi_（1-x）Co_xSi_2中搜索量子临界

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Polycrystalline samples of the isostructural alloys UNi_(1-x)Co_xSi_2 (0 ≤ x≤ 1) were studied by means of x-ray powder diffraction, magnetization, electrical resistivity, and specific-heat measurements, at temperatures down to 2 K and in magnetic fields up to 5 T. The experimental data revealed an evolution from strongly anisotropic ferromagnetism with pronounced Kondo effect, observed for the alloys with x < 0.98 and being gradually suppressed with rising Co content, to spin-glass-like states with dominant spin fluctuations, seen for the sample with x = 0.98. Extrapolation of the value of T_c(x) yields a critical concentration x_c = 1, at which the magnetic ordering entirely disappears. This finding is in line with preliminary data collected for stoichiometric UCoSi_2.

机译：通过X射线粉末衍射，磁化，电阻率和比热测量，在低至2 K的温度下以及在温度范围内的条件下研究了同构合金UNi_（1-x）Co_xSi_2（0≤x≤1）的多晶样品。磁场高达5T。实验数据显示，从具有明显的Kondo效应的强各向异性铁磁演变到在x <0.98且随着Co含量的增加而逐渐被抑制的合金，转变为具有主要自旋涨落的自旋玻璃态，对于x = 0.98的样本可见。 T_c（x）的值的外推得出临界浓度x_c = 1，在该浓度下，磁序完全消失。这一发现与为化学计量UCoSi_2收集的初步数据相符。

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来源
《Physical review》 |2012年第4期|p.045113.1-045113.7|共7页
作者
A. P. Pikul; D. Kaczorowski;
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作者单位

Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P Nr 1410, PL-50-590 Wroclaw 2, Poland;

Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P Nr 1410, PL-50-590 Wroclaw 2, Poland;

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正文语种 eng
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strongly correlated electron systems; heavy fermions; local moment in compounds and alloys; kondo effect, valence fluctuations, heavy fermions;

机译：强相关电子系统;重费米子化合物和合金中的局部力矩;近藤效应;化合价涨落;重费米子;

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Search for quantum criticality in a ferromagnetic system UNi_(1-x)Co_xSi_2

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