Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic excitation emergence relevant to carrier scattering in
  semimetal Yb$_3$Ir$_4$Ge$_{13}$   Inelastic neutron scattering experiments have been conducted to investigate
the semimetal system Yb$_3$Ir$_4$Ge$_{13}$. No clear crystal-field-split levels
were observed up to an excitation energy of 60 meV, while a magnetic excitation
appears at low energy below approximately 3 meV. This excitation shows a short
spatial correlation, and an energy spectrum is reproduced by an imaginary part
of generalized magnetic susceptibility on the basis of a damped harmonic
oscillator model. The magnetic excitation emerges simultaneously with an
anomalous electrical-resistivity enhancement below 20 K. The close relationship
between the magnetic and transport behaviors evidences that the semimetal
carriers are scattered by magnetic fluctuation dominated by the Yb $4f$ state.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys