Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-phonon and magnetostriction phenomena in CaMn7O12 helimagnet probed
  by Raman spectroscopy   In this letter we investigated the temperature-dependent Raman spectra of
CaMn7O12 helimagnet from room temperature down to 10 K. The temperature
dependence of the Raman mode parameters show remarkable anomalies for both
antiferromagnetic and incommensurate transitions that this compound undergoes
at low temperatures. The anomalies observed at the magnetic ordering transition
indicate a spin-phonon coupling at higher-temperature magnetic transition in
this material, while a magnetostrinction effect at the lower-temperature
magnetic transition.

37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga