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arXiv 1302.4791cond-mat.str-el
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FeCrAs的非金属非费米液体电阻率从0到17 GPa

Non-metallic, non-Fermi-liquid resistivity of FeCrAs from 0 to 17 GPa

F F Tafti, W Wu, S R Julian

摘要:

一个不寻常的,非金属电阻率的111铁磷属化合物FeCrAs被证明是相对不变的压力下,高达17 GPa。结合我们之前的发现,这种非金属行为持续从至少80 mK到800 K,这表明,非金属相是非常强大的。反铁磁有序在常压下的Neel温度T_N ~ 125 K,在10 GPa下以7.1 ± 0.1 K/GPa的速率被抑制到50 K以下。结果表明,在T_N处自旋密度波隙的形成对FeCrAs的低温非金属电阻率没有重要影响。

英文摘要:

An unusual, non-metallic resistivity of the 111 iron-pnictide compound FeCrAs is shown to be relatively unchanged under pressures of up to 17 GPa. Combined with our previous finding that this non-metallic behaviour persists from at least 80 mK to 800 K, this shows that the non-metallic phase is exceptionally robust. Antiferromagnetic order, with a Neel temperature T_N ~ 125 K at ambient pressure, is suppressed at a rate of 7.1 +/- 0.1 K/GPa, falling to below 50 K at 10 GPa. We conclude that formation of a spin-density wave gap at T_N does not play an important role in the non-metallic resistivity of FeCrAs at low temperatures.

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