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- W4313448097 abstract "The quasi-one-dimensional Chevrel phases, ${A}_{2}{mathrm{Mo}}_{6}{mathrm{Se}}_{6}$ ($A=mathrm{Tl}$, In, K, Rb, Cs), are of interest due to their atypical electronic properties. The Tl and In analogs undergo a superconducting transition whereas the alkali metal analogs show charge gapping of another, not well understood type. We report the results of inelastic neutron scattering on polycrystalline ${mathrm{In}}_{2}{mathrm{Mo}}_{6}{mathrm{Se}}_{6}$ (${T}_{mathrm{c}}=2.85$ K) and ${mathrm{Rb}}_{2}{mathrm{Mo}}_{6}{mathrm{Se}}_{6}$ (nonsuperconducting) samples, which reveal a column of intensity with linear dispersion from [0 0 1/2] to [0 0 1] in both compounds. The observed temperature and $|Q|$ independence together suggest the presence of unconventional carriers with a spin contribution to the excitation. This is contrary to the prevailing model for these materials, which is that they are nonmagnetic. The excitation has similar dispersion and $S(Q,phantom{rule{0.16em}{0ex}}mathrm{E},phantom{rule{0.16em}{0ex}}T)$ behavior as one observed in the structurally related superconducting compounds ${A}_{2}{mathrm{Cr}}_{3}{mathrm{As}}_{3}$ and ${A}_{2}{mathrm{Mo}}_{3}{mathrm{As}}_{3}$ ($A=mathrm{K}$, Rb, Cs), which has been interpreted as magnetic in origin and related to Fermi surface nesting. The connection is unexpected because the calculated Fermi surface of the arsenides differs substantially from the ${A}_{2}{mathrm{Mo}}_{6}{mathrm{Se}}_{6}$ compounds, and many consider them distinct classes of materials. This observation suggests a hidden link in the physics between both classes of superconductors, perhaps originating from their quasi-low-dimensional character." @default.
- W4313448097 created "2023-01-06" @default.
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- W4313448097 date "2022-12-20" @default.
- W4313448097 modified "2023-09-23" @default.
- W4313448097 title "Magnetic excitation linking quasi-one-dimensional Chevrel-type selenide and arsenide superconductors" @default.
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- W4313448097 doi "https://doi.org/10.1103/physrevmaterials.6.124804" @default.
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