Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magneto-Elastic Coupling in the Layered Manganite
  La$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$   We have studied the magneto-elastic coupling in the double layered Mn
perovskite La$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$ with an ultrasonic velocity
technique. The temperature profile of both the in-plane and out-of-plane
longitudinal velocities showed a large stiffening anomaly below the insulating
paramagnetic to metallic ferromagnetic transition. Magnetic fluctuations
effects consistent with the layered structure are evidenced as a frequency
dependent velocity softening above the transition. The magneto-elastic coupling
has been studied in magnetic field values up to 8 Tesla: the observations are
consistent with a substantial magnetic anisotropy and a ferromagnetic order
parameter with moments lying in the layers.

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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an