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arXiv 1604.01641cond-mat.mtrl-sci
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外尔半金属半Heusler化合物RPtBi(R = Gd和Nd)中的反常霍尔效应

Anomalous Hall effect in Weyl semimetal half Heusler compounds RPtBi (R = Gd and Nd)

Chandra Shekhar, Nitesh Kumar, V. Grinenko, Sanjay Singh, R. Sarkar, H. Luetkens, Shu-Chun Wu, Yang Zhang, Alexander C. Komarek, Erik Kampert, Yurii Skourski, J… 展开作者

Chandra Shekhar, Nitesh Kumar, V. Grinenko, Sanjay Singh, R. Sarkar, H. Luetkens, Shu-Chun Wu, Yang Zhang, Alexander C. Komarek, Erik Kampert, Yurii Skourski, Jochen Wosnitza, Walter Schnelle, Alix McCollam, Uli Zeitler, Jürgen Kübler, Binghai Yan, H. -H. Klauss, S. S. P. Parkin, C. Felser

摘要:

从拓扑绝缘体到Weyl和Dirac半金属,拓扑材料构成了凝聚态研究中最令人兴奋的领域之一。许多半赫斯勒化合物,RPtBi(R=稀土)已被理论预测为拓扑半金属。在RPtBi中设想的各种拓扑属性中,拓扑表面态、手征反常和平面霍尔效应已在实验中观察到。在这里,我们报告了一个不寻常的内在反常霍尔效应(AHE)的反铁磁Heusler Weyl半金属化合物GdPtBi和NdPtBi,观察到在很宽的温度范围内。特别是,GdPtBi表现出高达60 ohm-1cm-1的反常霍尔电导率和高达23%的反常霍尔角。用μ子自旋共振(mu-SR)研究了GdPtBi的反铁磁转变(T_N),发现在9 K时,T_N以上没有明显的磁关联。我们的研究表明,在这些半Heusler外尔点是由一个磁场通过交换分裂的电子带或附近的费米能量,这是源的手征异常和AHE。

英文摘要:

Topological materials ranging from topological insulators to Weyl and Dirac semimetals form one of the most exciting current fields in condensed-matter research. Many half-Heusler compounds, RPtBi (R= rare earth) have been theoretically predicted to be topological semimetals. Among various topological attributes envisaged in RPtBi, topological surface states, chiral anomaly and planar Hall effect have been observed experimentally. Here, we report on an unusual intrinsic anomalous Hall effect (AHE) in the antiferromagnetic Heusler Weyl semimetal compounds GdPtBi and NdPtBi that is observed over a wide temperature range. In particular, GdPtBi exhibits an anomalous Hall conductivity of up to 60 ohm-1cm-1 and an anomalous Hall angle as large as 23%. Muon spin resonance (mu-SR) studies of GdPtBi indicate a sharp antiferromagnetic transition (T_N) at 9 K without any noticeable magnetic correlations above T_N. Our studies indicate that Weyl points in these half-Heuslers are induced by a magnetic field via exchange-splitting of the electronic bands at or near to the Fermi energy which is the source of the chiral anomaly and the AHE.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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