The giant planar Hall effect and anisotropic magnetoresistance in Dirac node arcs semimetal PtSn4

J Yan; X Luo; J J Gao; H Y Lv; C Y Xi; Y Sun; W J Lu; P Tong; Z G Sheng; X B Zhu; W H Song; Y P Sun

doi:10.1088/1361-648X/ab851f

The giant planar Hall effect and anisotropic magnetoresistance in Dirac node arcs semimetal PtSn₄

J Phys Condens Matter. 2020 May 11;32(31). doi: 10.1088/1361-648X/ab851f.

Authors

J Yan^{1

2}, X Luo¹, J J Gao^{1

2}, H Y Lv¹, C Y Xi³, Y Sun⁴, W J Lu¹, P Tong¹, Z G Sheng^{3

5}, X B Zhu¹, W H Song¹, Y P Sun^{1

3

5}

Affiliations

¹ Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, People's Republic of China.
² University of Science and Technology of China, Hefei, 230026, People's Republic of China.
³ Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, People's Republic of China.
⁴ Institute of Physical Science and Information Technology, Anhui University, Hefei, 230601, People's Republic of China.
⁵ Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.

PMID: 32235052
DOI: 10.1088/1361-648X/ab851f

Abstract

Topological semimetals (TSMs) present intriguing quantum states and have attracted much attention in recent years because of exhibiting various anomalous magneto-transport phenomena. Theoretical prediction shows that some novel phenomena, such as negative magnetoresistance (MR) and the planar Hall effect (PHE), originate from the chiral anomaly in TSMs. In this work, high-field (33 T) Shubnikov-de Haas (SdH) oscillations are obtained to reveal the topology of PtSn₄. Giant PHE and anisotropic magnetoresistance (AMR) are observed in Dirac node arcs of semimetal PtSn₄. First, a non-zero transverse voltage can be acquired while tilting the in-plane magnetic field. Moreover, the amplitude of PHE sharply increases atT^*∼ 50 K with decreasing temperature, which is suggested to be related to the Fermi surface reconstruction observed in PtSn₄. Subsequently, the field-dependent amplitudes of the PHE show an abnormal behavior around 50 K, which is thought to stem from the complex correlation between the chiral charge and electric one in PtSn₄driving the system into different coupling states due to the complicated band structure. On the other hand, the relative AMR is negative and up to -98% at 8.5 T. Our work proves that the PHE measurements are a convincing transport fingerprint feature to confirm the chiral anomaly in TSMs.

Keywords: anisotropic magnetoresistance; planar Hall effect; topological materials.