title: Interplanar coupling-dependent magnetoresistivity in high-purity layered metals.
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.
authors.affiliation: National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan.|Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.
authors.forename: N
authors.initials: N
authors.lastname: Kikugawa
authors.affiliation: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.|Condensed Matter Theory Center, University of Maryland, College Park, Maryland 20742-4111, USA.
authors.forename: P
authors.initials: P
authors.lastname: Goswami
authors.affiliation: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.
authors.forename: A
authors.initials: A
authors.lastname: Kiswandhi
authors.affiliation: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.
authors.forename: E S
authors.initials: ES
authors.lastname: Choi
authors.affiliation: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.
authors.forename: D
authors.initials: D
authors.lastname: Graf
authors.affiliation: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Baumbach
authors.affiliation: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Brooks
authors.affiliation: National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Sugii
authors.affiliation: National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Iida
authors.affiliation: National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nishio
authors.affiliation: National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Uji
authors.affiliation: National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Terashima
authors.affiliation: H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK.
authors.forename: P M C
authors.initials: PM
authors.lastname: Rourke
authors.affiliation: High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, Nijmegen, The Netherlands.|Institute of Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
authors.forename: N E
authors.initials: NE
authors.lastname: Hussey
authors.affiliation: Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan.|Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Takatsu
authors.affiliation: Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yonezawa
authors.affiliation: Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Maeno
authors.affiliation: Condensed Matter Group, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA.
authors.forename: L
authors.identifier: http://orcid.org/0000-0002-5209-0293
authors.initials: L
authors.lastname: Balicas