Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Frustrated Ising chains on the triangular lattice in Sr$_3$NiIrO$_6$   Inelastic neutron scattering study on the spin-chain compound Sr$_3$NiIrO$_6$
reveals gapped quasi-1D magnetic excitations. The observed one-magnon band
between 29.5 and 39 meV consists of magnon modes of the Ni$^{2+}$ ions. The
fitting of the spin wave spectrum reveals strongly coupled Ising-like chains
along the $c$-axis that are weakly coupled into a frustrated triangular lattice
in the $ab$-plane. The magnetic excitations survive up to 200 K well above the
magnetic ordering temperature of $T_N \sim 75$ K, also indicating a quasi-1D
nature of the magnetic interactions in Sr$_3$NiIrO$_6$. Our microscopic model
is in good agreement with ab initio electronic structure calculations and
explains the giant spin flip field observed in bulk magnetization measurements.

25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an