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- W4313304561 abstract "We report a detailed study of the structural, magnetic, thermodynamic, and electronic properties of a coupled ${J}_{mathrm{eff}}$ = $frac{1}{2}$ alternating chain ${mathrm{Sr}}_{2}mathrm{Co}{({mathrm{SeO}}_{3})}_{3}$ compound using magnetic susceptibility $ensuremath{chi}(T)$, magnetic specific heat ${C}_{mathrm{m}}(T)$, magnetization, and neutron diffraction measurements along with first-principles calculations. The first-principles calculations based on the density functional theory suggest that ${mathrm{Sr}}_{2}mathrm{Co}{({mathrm{SeO}}_{3})}_{3}$ forms a quasi-one-dimensional chain with bond alternation and interchain interactions. $ensuremath{chi}(T), {C}_{mathrm{m}}(T),$ and neutron powder diffraction measurements confirm that no long-range magnetic ordering occurs down to 100 mK. Instead, a maximum in $ensuremath{chi}(T)$ and ${C}_{mathrm{m}}(T)$ and an exponential drop of $ensuremath{chi}(T)$ and ${C}_{p}(T)$ as $Tensuremath{rightarrow}0$ K point to a spin-singlet ground state. The analysis of $ensuremath{chi}(T)$ and ${C}_{mathrm{m}}(T)$ based on a ${J}_{1}text{ensuremath{-}}{J}_{2}$ alternating Heisenberg model shows the bond alternation $ensuremath{alpha}={J}_{2}/{J}_{1}ensuremath{approx}0.7$ and a spin gap of $mathrm{ensuremath{Delta}}ensuremath{approx}3$ K. Our work demonstrates that ${mathrm{Sr}}_{2}mathrm{Co}{({mathrm{SeO}}_{3})}_{3}$ is a coupled alternating chain system based on spin-orbit entangled ${J}_{mathrm{eff}}$ = $frac{1}{2}$." @default.
- W4313304561 created "2023-01-06" @default.
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- W4313304561 date "2022-12-16" @default.
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- W4313304561 title "Spin-singlet ground state of the coupled <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>J</mml:mi><mml:mtext>eff</mml:mtext></mml:msub></mml:math> = <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> alternating chain system <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi mathvariant=normal>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>Co</…" @default.
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- W4313304561 doi "https://doi.org/10.1103/physrevb.106.214417" @default.
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