Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Secondary Phase Limited Metal-Insulator Phase Transition in Chromium
  Nitride Thin Films   Chromium nitride (CrN) is a well-known hard coating material that has found
applications in abrasion and wear-resistant cutting tools, bearings, and
tribology applications due to its high hardness, high-temperature stability,
and corrosion-resistant properties. In recent years, CrN has also attracted
significant interest due to its high thermoelectric power factor, and for its
unique and intriguing metal-insulator phase transition. While CrN bulk
single-crystals exhibit the characteristic metal-insulator transition
accompanied with structural (orthorhombic-to-rocksalt) and magnetic
(antiferromagnetic-to-paramagnetic) transition at ~260-280K, observation of
such phase transition in thin-film CrN has been scarce and highly debated. In
this work, the formation of the secondary metallic Cr2N phase during the growth
is demonstrated to inhibit the observation of metal-insulator phase transition
in CrN thin films. When the Cr-flux during deposition is reduced below a
critical limit, epitaxial and stoichiometric CrN thin film is obtained that
reproducibly exhibits the phase transition. Annealing of the mixed-phase film
inside reducing NH3 environment converts the Cr2N into CrN, and a discontinuity
in the electrical resistivity at ~ 277 K appears which supports the underlying
hypothesis. A clear demonstration of the origin behind the controversy of the
metal-insulator transition in CrN thin films marks significant progress and
would enable its nanoscale device realization.

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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci