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- W4387461457 abstract "We performed $^{13}mathrm{C}$ NMR measurements on $ensuremath{lambda}text{ensuremath{-}}{(mathrm{BEDSe}text{ensuremath{-}}mathrm{TTF})}_{2}{mathrm{FeCl}}_{4}$[BEDSe-TTF = bis(ethylenediseleno) tetrathiafulvalene] to investigate the antiferromagnetic transition in this material and evaluate the exchange interaction ${J}_{ensuremath{pi}mathit{d}}$ between the donor molecules and ${mathrm{FeCl}}_{4}^{ensuremath{-}}$ anions. Based on the NMR spectrum and the nuclear spin-lattice relaxation rate, we determined that the antiferromagnetic transition in the donor layers occurs at 25 K. The structure of the NMR spectra in the antiferromagnetic phase resembles that of $ensuremath{lambda}text{ensuremath{-}}{(mathrm{BEDSe}text{ensuremath{-}}mathrm{TTF})}_{2}{mathrm{GaCl}}_{4}$. We used the angle dependence of the NMR shift in the paramagnetic phase and the experimentally determined demagnetization factor to estimate ${J}_{ensuremath{pi}mathit{d}}$ of $ensuremath{lambda}{text{-(BEDSe-TTF)}}_{2}{mathrm{FeCl}}_{4}$ as 3.4(7) $mathrm{T}/textmu{}{}_{mathrm{B}}$ . This result shows that the $ensuremath{pi}text{ensuremath{-}}d$ interaction of $ensuremath{lambda}{text{-(BEDSe-TTF)}}_{2}{mathrm{FeCl}}_{4}$ is weaker than that of $ensuremath{lambda}text{ensuremath{-}}{(mathrm{BETS})}_{2}{mathrm{FeCl}}_{4}$. The different signs of ${J}_{ensuremath{pi}mathit{d}}$ between $ensuremath{lambda}text{ensuremath{-}}{(mathrm{BEDSe}text{ensuremath{-}}mathrm{TTF})}_{2}{mathrm{FeCl}}_{4}$ and $ensuremath{lambda}text{ensuremath{-}}{(mathrm{BETS})}_{2}{mathrm{FeCl}}_{4}$ could be attributed to the different paths for the $ensuremath{pi}text{ensuremath{-}}d$ interaction in the two systems." @default.
- W4387461457 created "2023-10-10" @default.
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- W4387461457 date "2023-10-09" @default.
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- W4387461457 title "Antiferromagnetic ordering and estimation of the exchange interaction in the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>π</mml:mi><mml:mtext>−</mml:mtext><mml:mi>d</mml:mi></mml:math> system <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>λ</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>BEDSe</mml:mi><mml:mtext>−</mml:mtext><mml:mi>TTF</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:…" @default.
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- W4387461457 doi "https://doi.org/10.1103/physrevb.108.155112" @default.
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