Interplanar coupling-dependent magnetoresistivity in high-purity layered metals

N. Kikugawa, P. Goswami, A. Kiswandhi, E. S. Choi, D. Graf, R. E. Baumbach, J. S. Brooks, K. Sugii, Y. Iida, M. Nishio, S. Uji, T. Terashima, P.M.C. Rourke, N. E. Hussey, H. Takatsu, S. Yonezawa, Y. Maeno and L. Balicas ()
Additional contact information
N. Kikugawa: National Institute for Materials Science
P. Goswami: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University
A. Kiswandhi: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University
E. S. Choi: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University
D. Graf: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University
R. E. Baumbach: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University
J. S. Brooks: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University
K. Sugii: National Institute for Materials Science
Y. Iida: National Institute for Materials Science
M. Nishio: National Institute for Materials Science
S. Uji: National Institute for Materials Science
T. Terashima: National Institute for Materials Science
P.M.C. Rourke: H.H. Wills Physics Laboratory, University of Bristol
N. E. Hussey: High Field Magnet Laboratory (HFML-EMFL), Radboud University
H. Takatsu: Tokyo Metropolitan University
S. Yonezawa: Graduate School of Science, Kyoto University
Y. Maeno: Graduate School of Science, Kyoto University
L. Balicas: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract The magnetic field-induced changes in the conductivity of metals are the subject of intense interest, both for revealing new phenomena and as a valuable tool for determining their Fermi surface. Here we report a hitherto unobserved magnetoresistive effect in ultra-clean layered metals, namely a negative longitudinal magnetoresistance that is capable of overcoming their very pronounced orbital one. This effect is correlated with the interlayer coupling disappearing for fields applied along the so-called Yamaji angles where the interlayer coupling vanishes. Therefore, it is intrinsically associated with the Fermi points in the field-induced quasi-one-dimensional electronic dispersion, implying that it results from the axial anomaly among these Fermi points. In its original formulation, the anomaly is predicted to violate separate number conservation laws for left- and right-handed chiral (for example, Weyl) fermions. Its observation in PdCoO2, PtCoO2 and Sr2RuO4 suggests that the anomaly affects the transport of clean conductors, in particular near the quantum limit.

Date: 2016
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DOI: 10.1038/ncomms10903

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