Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Martensitic transformation in V_3Si single crystal: ^51V NMR evidence
  for coexistence of cubic and tetragonal phases   The Martensitic transformation (MT) in A15 binary-alloy superconductor V_3Si
is a second-order, displacive structural transition from cubic to tetragonal
symmetry, at temperature T_m a few K above the superconducting transition
temperature T_c = 17 K. Though studied extensively, the MT has not yet been
conclusively linked with a transition to superconductivity, and remains
relevant, e.g. due to renewed interest in soft phonon modes, while V_3Si
continues to be of interest, e.g. due to similarities with Fe-As
superconductors. Previous NMR studies on the MT in V_3Si have mainly been on
powder samples, and with little emphasis on temperature dependence during the
transformation. Here we study a high-quality single crystal, where quadrupolar
splitting and Knight shift of NMR spectra for ^51V allowed us to distinguish
between spectra from transverse chains of V as a function of temperature. Our
data revealed that the MT is not abrupt, but rather there is a microscopic
coexistence of untransformed cubic phase and transformed tetragonal phase over
a few K below and above T_m, and that the Martensitic lengthening of one axis
occurs predominantly in a plane perpendicular to the crystal growth axis, as
twinned domains.

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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: q-alg