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@INPROCEEDINGS{Rai:877253,
      author       = {Rai, Venus},
      title        = {{C}hiral {A}nomaly and {A}nomalous {H}all {E}ffect in
                      parent and {F}e doped {H}exagonal-{M}n3+δ{G}e {W}eyl
                      semimetals},
      reportid     = {FZJ-2020-02079},
      year         = {2020},
      abstract     = {Topological quantum materials have attracted enormous
                      attention since their discovery due to the observed
                      anomalous transport properties, which originate from the
                      non-zero Berry curvature. Mn3+δGe has gained special
                      attention because of its large anomalous transport effects
                      that persist starting from Néel temperature (365 K) down to
                      2 K. Due to the presence of very small in-plane
                      ferromagnetic component, chirality of magnetic structure can
                      be controlled easily by applying just a few hundred Oersted
                      (Oe) of magnetic field. Hexagonal - Mn3+δGe stabilizes in
                      the range of δ = 0.2 – 0.55. In order to understand the
                      involved quantum phenomena - Anomalous Hall effect (AHE) -
                      in such materials, it is also important to check the
                      stability of AHE with the variation of δ. Due to specific
                      mirror symmetry of the triangular antiferromagnetic
                      structure, AHE is expected to be observed when magnetic
                      field (B) is applied along x or y crystallographic axis. AHE
                      has been reported in the lower range of δ (= 0.22, 0.32
                      [Kiyohara et al. (2015)]), however the upper range of δ was
                      still unexplored. We have investigated samples with the
                      upper range of δ (~ 0.55) and AHE with very small Hall -
                      hysteresis (<200 Oe) was observed when the magnetic field
                      was applied along x or y crystallographic axis. The
                      magnitude of AHE in Mn3+0.55Ge is found to be more than
                      $25\%$ larger than the reported AHE for samples with δ =
                      0.22 – 0.32 (Kiyohara et al. (2015)). In addition to this,
                      Fe doping in Mn3.2Ge has also shown AHE of comparable
                      magnitude as observed in case of Mn3+0.55Ge. Despite being
                      considered as a Weyl semimetal, chiral anomaly (signature
                      for the presence of Weyl points) has not been observed in
                      Mn3+δGe yet. To establish the claim for the existence of
                      Weyl points in Mn3+δGe, transverse and longitudinal
                      magneto-resistance (MR) measurement was performed with the
                      magnetic field and electric current applied along several
                      combinations of x, y, z crystallographic axes. Angle
                      dependent measurements between the direction of current and
                      applied magnetic field has clearly shown the presence of
                      negative longitudinal MR as long as I||B. Negative
                      longitudinal MR is observed over a long range of magnetic
                      field and temperature. However, the monotonic increase in
                      magneto-resistace with angle (θ) between I and B is
                      observed for the intermediate magnetic field range (0.5 T- 2
                      T). This behavior is the signature of the chiral anomaly,
                      which evidently supports the claim for the presence of Weyl
                      points in Mn3+δGe compounds.},
      month         = {May},
      date          = {2020-05-28},
      organization  = {Institutsseminar des JCNS-2,
                       Forschungszentrum Jülich (Germany), 28
                       May 2020 - 28 May 2020},
      subtyp        = {Invited},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/877253},
}