Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reduction of critical field for magnetic and orbital-ordering phase
  transition in impurity-substituted Nd$_{0.45}$Sr$_{0.55}$MnO$_3$ crystal   We have investigated the Mn-site substitution effect in
Nd$_{0.45}$Sr$_{0.55}$MnO$_3$ single crystal, which has an $A$-type layered
antiferromagnetic ($A$-AFM) phase with the 3$d_{x^2-y^2}$-type orbital-order.
Substitution of Fe or Ga for Mn-site suppresses both the $A$-AFM order and
competing ferromagnetic (FM) correlation whereas Cr substitution suppresses
only the $A$-AFM order but reactivates the underlying FM correlation via
double-exchange mechanism along the AFM coupled $c$-direction. In
Nd$_{0.45}$Sr$_{0.55}$Mn$_{0.95}$Cr$_{0.05}$O$_3$, the $A$-AFM state with the
orbital-order is changed into the orbital-disordered three-dimensional FM
metallic state by applying magnetic field of $\mu_0 H = 12$ T, which is much
smaller than that of the parent compound Nd$_{0.45}$Sr$_{0.55}$MnO$_3$.

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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex