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arXiv 0912.2277cond-mat.str-elcond-mat.mtrl-sci
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RMAs2(R = Pr和Sm,M = Ag和Au)的磁、电输运异常

Magnetic and electrical transport anomalies in RMAs2 (R= Pr and Sm, M= Ag and Au)

K. Mukherjee, E. V. Sampathkumaran, D. Rutzinger, Th. Doert, M. Ruck

摘要:

的化合物,RMAs2(R = Pr和Sm; M = Ag,Au),结晶在HfCuSi2衍生结构的磁化强度,热容量和电阻率(ρ)的研究结果的报告。PrAgAs 2在T_N = 5K时为反铁磁性。然而,Au类似物在低至1.8K时不表现出长程磁序。我们推断这是由于它们的晶体学特征的细微差异,特别注意到,具有相同晶体结构的Sm化合物作为前一顺序的磁性几乎在相同的温度(约17 K)。看来,在PrAgAs 2,SmAgAs 2和SmAuAs 2中,在较低温度下存在额外的磁性转变,好像晶体结构的相似性也导致磁性的相似性。PrAgAs 2和PrAuAs 2的ρ在顺磁状态下在一定温度范围内表现出负温度系数。SmAuAs 2在T_N处表现出磁布里渊区带隙效应,而SmAgAs 2在T_N以上的45 K处表现出一个很宽的磁布里渊区带隙。因此,这些化合物显示出有趣的磁性和输运性质。

英文摘要:

The results of magnetization, heat-capacity, and electrical resistivity (rho) studies of the compounds, RMAs2 (R= Pr and Sm; M= Ag, Au), crystallizing in HfCuSi2-derived structure are reported. PrAgAs2 orders antiferromagnetically at T_N= 5 K. The Au analogue, however, does not exhibit long range magnetic order down to 1.8 K. We infer that this is due to subtle differences in their crystallographic features, particularly noting that both the Sm compounds with identical crystal structure as that of former order magnetically nearly at the same temperature (about 17 K). It appears that, in PrAgAs2, SmAgAs2, and SmAuAs2, there is an additional magnetic transition at a lower temperature, as though the similarity in the crystal structure results in similarities in magnetism as well. The rho for PrAgAs2 and PrAuAs2 exhibits negative temperature coefficient in some temperature range in the paramagnetic state. SmAuAs2 exhibits magnetic Brillouin-zone gap effect in rho at T_N, while SmAgAs2 shows a well-defined broad minimum well above T_N around 45 K. Thus, these compounds reveal interesting magnetic and transport properties.

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