Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Novel synthesis method of nonstoichiometric Na2-xIrO3. Crystal
  structure, transport and magnetic properties   Transition metal oxides with 4d or 5d metals are of great interest due to the
competing interactions, of the Coulomb repulsion and the itineracy of the
d-electrons, opening a possibility of building new quantum ground states.
Particularly the 5d metal oxides containing Iridium have received significant
attention within the last years, due to their unexpected physical properties,
caused by a strong spin orbit coupling observed in Ir(IV). A prominent example
is the Mott-insulator Sr2IrO4. Another member of this family, the honeycomb
lattice compound Na2IrO3, also being a Mott-insulator having, most probably, a
Kitaev spin liquid ground state. By deintercalating sodium from Na2IrO3, we
were able to synthesize a new honeycomb lattice compound with more than 50%
reduced sodium content. The reduction of the sodium content in this layered
compound leads to a change of the oxidation state of iridium from +IV to +V/+VI
and a symmetry change from C2/c to P-3. This goes along with significant
changes of the physical properties. Besides the vanishing magnetic ordering at
15K, also the transport properties changes and instead insulating
semiconducting properties are observed.

11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org