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Title: Interplanar coupling-dependent magnetoresistivity in high-purity layered metals

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. Furthermore, its observation in PdCoO 2, PtCoO 2 and Sr 2RuO 4 suggests that the anomaly affects the transport of clean conductors, in particular near the quantum limit.
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [8] ; ORCiD logo [3]
  1. National Institute for Materials Science, Ibaraki (Japan); Florida State Univ., Tallahassee, FL (United States)
  2. Florida State Univ., Tallahassee, FL (United States); Univ. of Maryland, College Park, MD (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
  4. National Institute for Materials Science, Ibaraki (Japan)
  5. Univ. of Bristol, Bristol (United Kingdom)
  6. Radboud Univ., Nijmegen (The Netherlands)
  7. Tokyo Metropolitan Univ., Tokyo (Japan); Kyoto Univ., Kyoto (Japan)
  8. Kyoto Univ., Kyoto (Japan)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
OSTI Identifier: