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Anomalous Hall effect in ZrTe5

Abstract

Research in topological matter has expanded to include the Dirac and Weyl semimetals1,2,3,4,5,6,7,8,9,10, which feature three-dimensional Dirac states protected by symmetry. Zirconium pentatelluride has been of recent interest as a potential Dirac or Weyl semimetal material. Here, we report the results of experiments performed by in situ three-dimensional double-axis rotation to extract the full 4π solid angular dependence of the transport properties. A clear anomalous Hall effect is detected in every sample studied, with no magnetic ordering observed in the system to the experimental sensitivity of torque magnetometry. Large anomalous Hall signals develop when the magnetic field is rotated in the plane of the stacked quasi-two-dimensional layers, with the values vanishing above about 60 K, where the negative longitudinal magnetoresistance also disappears. This suggests a close relation in their origins, which we attribute to the Berry curvature generated by the Weyl nodes.

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Acknowledgements

The research was supported by the US Army Research Office under contract ARO W911NF-16-1-0116. N.P.O. acknowledges the support of the Gordon and Betty Moore Foundation's EPiQS Initiative through grant GBMF4539. The crystal growth was carried out by Q.G., S.K. and R.J.C., with support from the US National Science Foundation (NSF MRSEC grant DMR 1420541). J.A.S., P.S.K. and Z.-X. S. were supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract DE-AC02-76SF00515. T.L., J.A.S. and H.X. acknowledge support by the Gordon and Betty Moore Foundation's EPiQS Initiative through grant GBMF4546. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under contract DE-AC02-76SF00515.

Author information

T.L. and N.P.O. conceived the idea behind the experiment. T.L. designed the experiment with double-axis rotator and carried out the transport measurements with some assistance from J.L., M.L. and W.W. The crystals were grown and characterized by Q.G., S.K. and R.J.C. The high-momentum-resolution laser-ARPES measurements were made and studied by H.X., J.A.S., P.S.K. and Z.-X.S. Synchrotron ARPES measurements at beamline 5-4 of SSRL were made by T.L. and M.H. Analyses of the measurements were carried out by T.L. and N.P.O. The manuscript was written by T.L. and N.P.O. All authors discussed the results and commented on the manuscript.

Competing interests

The authors declare no competing interests.

Correspondence to Tian Liang or N. P. Ong.

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Further reading

Fig. 1: Resistivity, magnetization and ARPES spectrum of ZrTe5.
Fig. 2: Angular dependence of MR and Hall signals in sample Z2.
Fig. 3: Full 4π solid angular dependence of AHE in sample ZQ3.
Fig. 4: Temperature and angular dependence of transport properties in samples ZQ4 and Z5.