A magnetic excitation linking quasi-1D Chevrel-type selenide and arsenide superconductors
arxiv(2021)
Abstract
The quasi-one-dimensional Chevrel phases, A_2Mo_6Se_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_2Mo_6Se_6 (T_c = 2.85K) and Rb_2Mo_6Se_6
(T_MIT ≈170K) which reveal a highly dispersive column of
intensity present in both compounds near Q = 1.0 Å^-1. The excitation
is nearly indistinguishable from another excitation observed in the
structurally related superconducting compound K_2Cr_3As_3, which has been
interpreted as magnetic in origin and related to Fermi surface nesting.
However, the calculated Fermi surface of K_2Cr_3As_3 differs
substantially from the A_2Mo_6Se_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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