Random-exchange Heisenberg behavior in the electron-doped quasi-one-dimensional spin-1 chain compound AgVP 2 S 6
Year: 2024
Type: article
Abstract: Recent theoretical work suggests that a pair-density wave superconducting state can be realized by doping a one-dimensional spin-1 chain. Here, we report the physical properties of single crystals of ${\mathrm{Mg}}_{x}{\mathrm{Ag}}_{1\ensuremath{-}x}{\mathrm{VP}}_{2}{\mathrm{S}}_{6}$ $[x=0,$ $x=0.017(6),$ $x=0.067(8), \text{and} 0.098(11)]$ prepared by solid-state synthesis. Single-crystal x-ray-diffraction measurements confirm that $\mathrm{M}{\mathrm{g}}^{2+}$ is substituting for $\mathrm{A}{\mathrm{g}}^{+}$ to electron dope the ${\mathrm{V}}^{3+}$ zigzag chains. Magnetization measurements reveal that electron doping breaks up the ${\mathrm{V}}^{3+}$ chains, resulting in unpaired spins at the chain ends. The ${\mathrm{Mg}}_{x}{\mathrm{Ag}}_{1\ensuremath{-}x}{\mathrm{VP}}_{2}{\mathrm{S}}_{6}$ series is consistent with random-exchange Heisenberg antiferromagnetic chain behavior and can be well described by the exchange-coupled pair model at low temperatures. Transport measurements show ${\mathrm{Mg}}_{x}{\mathrm{Ag}}_{1\ensuremath{-}x}{\mathrm{VP}}_{2}{\mathrm{S}}_{6}$ remains insulating in the range 0 $\ensuremath{\le}$ $x$ $\ensuremath{\le} 0.098(11)$, with the band gap decreasing to $\ensuremath{\sim}0.2\phantom{\rule{0.16em}{0ex}}\mathrm{eV}$ at $x=0.098(11)$.
Institution: Johns Hopkins University
Language: Latvian
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4401577638