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arXiv 0901.4909cond-mat.str-el
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CeNiGe2与众不同的phase diagram

The unusual phase diagram of CeNiGe2

A. T. Holmes, T. Muramatsu, D. Kaczorowski, Z. Bukowski, T. Kagayama, K. Shimizu

摘要:

本文用电阻率法和交流量热法研究了压力从4GPa到40mK范围内的重费米子反铁磁体CeNiGe_2。在0.1 GPa下,在T_N_1 =3.95和T_{N2} =3.21 K时,在电阻率和比热中发现的两个磁转变被0.7 GPa和2.81 K时的一个磁转变所取代。增加压力最初进一步降低这一点,然而,在约1.7 GPa的一个新的过渡出现,伴随着显着的变化,在压力依赖性的有序温度,温度依赖性的电阻率,和剩余电阻率。有迹象表明,这种新的过渡具有某种第一顺序的特征。CeNiGe 2的相图与广泛用于分类重费米子化合物的Doniach相图几乎没有相似之处。

英文摘要:

The heavy fermion antiferromagnet CeNiGe2 was investigated under pressure by resistivity and ac calorimetry up to 4 GPa and down to 40 mK. The two magnetic transitions found in both resistivity and specific heat at 0.1 GPa at T_N1=3.95 and T_{N2}=3.21 K are replaced by a single one at 0.7 GPa and 2.81 K. Increasing pressure initially reduces this further, however at about 1.7 GPa a new transition appears, accompanied by a marked change in the pressure dependence of the ordering temperatures, the temperature dependence of the resistivity, and the residual resistivity. There are signs that this new transition has some first order character. The phase diagram of CeNiGe2 bears little resemblance to the Doniach phase diagram widely used to classify heavy fermion compounds.

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