Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-of-flight elastic and inelastic neutron scattering studies on the
  localized $4d$ electron layered perovskite La$_5$Mo$_4$O$_{16}$   The magnetic structure and spin-wave excitations in the quasi-square-lattice
layered perovskite compound La$_5$Mo$_4$O$_{16}$ were studied by a combination
of neutron diffraction and inelastic neutron scattering techniques using
polycrystalline sample. Neutron powder diffraction refinement revealed that the
magnetic structure is ferrimagnetic in the $ab$ plane with antiferromagnetic
stacking along the $c$ axis where the magnetic propagation vector is
$\mathbf{k}=\left(0,0,\frac{1}{2}\right)$. The ordered magnetic moments are
estimated to be $0.54(2)\mu_\text{B}$ for Mo$^{5+}$ ($4d^1$) ions and
$1.07(3)\mu_\text{B}$ for Mo$^{4+}$ ($4d^2$) ions at 4 K, which are about half
of the expected values. The inelastic neutron scattering results display strong
easy-axis magnetic anisotropy along the $c$ axis due to the spin-orbit
interaction in Mo ions evidenced by the spin gap at the magnetic zone center.
The model Hamiltonian consisting of in-plane anisotropic exchange interactions,
the interlayer exchange interaction, and easy-axis single-ion anisotropy can
explain our inelastic neutron scattering data well. Strong Ising-like
anisotropy and weak interlayer coupling compared with the intralayer exchange
interaction can explain both the high-temperature magnetoresistance and
long-time magnetization decay recently observed in La$_5$Mo$_4$O$_{16}$.

3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin