Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital effect and weak localization physics in the longitudinal
  magnetoresistance of the Weyl semimetals NbP, NbAs, TaP and TaAs   Weyl semimetals such as the TaAs family (TaAs, TaP, NbAs, NbP) host
quasiparticle excitations resembling the long sought after Weyl fermions at
special band-crossing points in the band structure denoted as Weyl nodes. They
are predicted to exhibit a negative longitudinal magnetoresistance (LMR) due to
the chiral anomaly if the Fermi energy is sufficiently close to the Weyl
points. However, current jetting effects, i.e. current inhomogeneities caused
by a strong, field-induced conductivity anisotropy in semimetals, have a
similar experimental signature and therefore have hindered a determination of
the intrinsic LMR in the TaAs family so far. This work investigates the
longitudinal magnetoresistance of all four members of this family along the
crystallographic $a$ and $c$ direction. Our samples are of similar quality as
those previously studied in the literature and have a similar chemical
potential as indicated by matching quantum oscillation (QO) frequencies. Care
was taken to ensure homogeneous currents in all measurements. As opposed to
previous studies where this was not done, we find a positive LMR that saturates
in fields above 4 T in TaP, NbP and NbAs for $B||c$. Using Fermi-surface
geometries from band structure calculations that had been confirmed by
experiment, we show that this is the behaviour expected from a classical purely
orbital effect, independent on the distance of the Weyl node to the Fermi
energy. The TaAs family of compounds is the first to show such a simple LMR
without apparent influences of scattering anisotropy. In configurations where
the orbital effect is small, i.e. for $B||a$ in NbAs and NbP, we find a
non-monotonous LMR including regions of negative LMR. We discuss a weak
antilocalisation scenario as an alternative interpretation than the chiral
anomaly for these results, since it can fully account for the overall field
dependence.

0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an