Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single crystal growth and anisotropic magnetic properties of
  Li$_2$Sr[Li$_{1-x}$Fe$_x$N]$_2$   Up to now, investigation of physical properties of ternary and higher
nitridometalates was severely hampered by challenges concerning phase purity
and crystal size. Employing a modified lithium flux technique, we are now able
to prepare sufficiently large single crystals of the highly air and moisture
sensitive nitridoferrate $\rm Li_2Sr[Li_{1-x}Fe_xN]_2$ for anisotropic
magnetization measurements. The magnetic properties are most remarkable: large
anisotropy and coercivity fields of 7 Tesla at $T = 2$ K indicate a significant
orbital contribution to the magnetic moment of iron. Altogether, the novel
growth method opens a route towards interesting phases in the comparatively
recent research field of nitridometalates and should be applicable to various
other materials.

35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat