Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Emergence of a Dynamic Super-Structural Order Integrating
  Antiferroelectric and Antiferrodistortive Competing Instabilities in EuTiO3   Microscopic structural instabilities of EuTiO3 single crystal were
investigated by synchrotron x-ray diffraction. Antiferrodistortive (AFD) oxygen
octahedral rotational order was observed alongside Ti derived antiferroelectric
(AFE) distortions. The competition between the two instabilities is reconciled
through a cooperatively modulated structure allowing both to coexist. The
electric and magnetic field effect on the modulated AFD order shows that the
origin of large magnetoelectric coupling is based upon the dynamic equilibrium
between the AFD - antiferromagnetic interactions versus the electric
polarization - ferromagnetic interactions.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci