Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A magnetic excitation linking quasi-1D Chevrel-type selenide and
  arsenide superconductors   The quasi-one-dimensional Chevrel phases, $A_2$Mo$_6$Se$_6$ ($A$ = Tl, In, K,
Rb, Cs), are of interest due to their atypical electronic properties. The Tl
and In analogues undergo a superconducting transition whereas the alkali metal
analogues undergo metal-to-insulator transitions, neither of which is fully
understood. We report the results of inelastic neutron scattering on
polycrystalline In$_2$Mo$_6$Se$_6$ ($T_c$ = 2.85$\,$K) and Rb$_2$Mo$_6$Se$_6$
($T_{MIT}$ $\approx \,$170K) which reveal a highly dispersive column of
intensity present in both compounds near $Q$ = 1.0 $\r{A}^{-1}$. The excitation
is nearly indistinguishable from another excitation observed in the
structurally related superconducting compound K$_2$Cr$_3$As$_3$, which has been
interpreted as magnetic in origin and related to Fermi surface nesting.
However, the calculated Fermi surface of K$_2$Cr$_3$As$_3$ differs
substantially from the $A_2$Mo$_6$Se$_6$ compounds, and many consider them
distinct classes of materials. Nevertheless, the new observation is most
consistent with a magnetic origin, linking the physics of both classes. These
findings suggest that the selenide and arsenide compounds are more closely
related than originally thought, with properties falling on the same continuum.

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The categories of this paper are: math
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th