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首页> 外文期刊>Physical review >Specific heat variation as T~(0.5) in Th-doped UIr_2Zn_(20): Consistent with weak coupled quantum critical behavior
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Specific heat variation as T~(0.5) in Th-doped UIr_2Zn_(20): Consistent with weak coupled quantum critical behavior

机译:Th掺杂的UIr_2Zn_(20)中的比热变化为T〜(0.5):与弱耦合量子临界行为一致

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摘要

By partially replacing the U in single crystals of UIr_2Zn_2o with Th, we have suppressed the 2.1 K ferromagnetic-like transition present in the pure compound. The magnetic susceptibilities of U_(1-x)Th_xZn_(20) show enhanced low-temperature values, with χ (2 K) for χ=0.25 around 140 memu/Umole. However, unlike the parent compound, for U_(1-x)Th_xIr_2Zn_(20) (x≥0.25) the extrapolation of even the lowest temperature 1/χ vs T data shows an intercept on the negative temperature axis-consistent with antiferromagnetic fluctuations. The specific heat at low temperature in U_(0.75)Th_(0.25)Ir_2Zn_(20) shows no magnetic transition down to 0.4 K, but rather obeys C/T=γ-αT~(0.5) over more than a decade of temperature, consistent with weak-coupling three-dimensional antiferromagnetic fluctuations. Low temperature resistivity data show an unusual non-Fermi-liquid temperature dependence, where p=p_0+aT~α with a< 1. The specific-heat data for U_(0.5)Th_(0.5)Ir_2Zn_(20) can be fit within the normal Fermi-liquid picture by the addition of a T~3 log T/T_(SF) term, where T_(SF) is the spin-fluctuation temperature.
机译:通过用Th部分取代UIr_2Zn_2o单晶中的U,我们抑制了纯化合物中存在的2.1 K铁磁状跃迁。 U_(1-x)Th_xZn_(20)的磁化率显示出增强的低温值,其中χ(2 K)对于140摩尔/ Umol处的χ= 0.25。但是,与母体化合物不同,对于U_(1-x)Th_xIr_2Zn_(20)(x≥0.25),即使是最低温度1 /χvs T数据的外推也显示出负温度轴上的截距与反铁磁波动一致。 U_(0.75)Th_(0.25)Ir_2Zn_(20)在低温下的比热在低至0.4 K时没有磁化跃迁,但在十多个温度下服从C / T =γ-αT〜(0.5),符合弱耦合三维反铁磁波动。低温电阻率数据显示出非常规的非费米液体温度依赖性,其中p = p_0 + aT〜α且a <1。U_(0.5)Th_(0.5)Ir_2Zn_(20)的比热数据可在通过添加T〜3 log T / T_(SF)项获得正常的费米液体图片,其中T_(SF)是自旋涨落温度。

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