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- W2319310586 abstract "The superconducting transition temperature ${T}_{mathrm{c}}$ of ammoniated metal-doped FeSe ${(mathrm{N}{mathrm{H}}_{3})}_{y}{M}_{x}mathrm{FeSe}$ $(M$: metal atom) has been scaled with the FeSe plane spacing, and it has been suggested that the FeSe plane spacing depends on the location of metal atoms in ${(mathrm{N}{mathrm{H}}_{3})}_{y}{M}_{x}mathrm{FeSe}$ crystals. Although the crystal structure of ${(mathrm{N}{mathrm{H}}_{3})}_{y}mathrm{L}{mathrm{i}}_{x}mathrm{FeSe}$ exhibiting a high ${T}_{mathrm{c}}$ (ensuremath{sim}44 K) was determined from neutron diffraction, the structure of ${(mathrm{N}{mathrm{H}}_{3})}_{y}{M}_{x}mathrm{FeSe}$ exhibiting a low ${T}_{mathrm{c}}$ (ensuremath{sim}32 K) has not been determined thus far. Here, we determined the crystal structure of ${(mathrm{N}{mathrm{H}}_{3})}_{y}mathrm{C}{mathrm{s}}_{0.4}mathrm{FeSe}({T}_{mathrm{c}}=33phantom{rule{0.28em}{0ex}}mathrm{K})$ through the Rietveld refinement of the x-ray diffraction (XRD) pattern measured with synchrotron radiation at 30 K. The XRD pattern was analyzed based on two different models, on-center and off-center, under a space group of $I4/mmm$. In the on-center structure, the Cs occupies the $2a$ site and the N of $mathrm{N}{mathrm{H}}_{3}$ may occupy either the $4c$ or $2b$ site, or both. In the off-center structure, the Cs may occupy either the $4c$ or $2b$ site, or both, while the N occupies the $2a$ site. Only an on-center structure model in which the Cs occupies the $2a$ and the N of $mathrm{N}{mathrm{H}}_{3}$ occupies the $4c$ site provided reasonable results in the Rietveld analysis. Consequently, we concluded that ${(mathrm{N}{mathrm{H}}_{3})}_{y}mathrm{C}{mathrm{s}}_{0.4}mathrm{FeSe}$ can be assigned to the on-center structure, which produces a smaller FeSe plane spacing leading to the lower ${T}_{mathrm{c}}$." @default.
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- W2319310586 date "2016-03-08" @default.
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- W2319310586 title "Correlation of superconductivity with crystal structure in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant=normal>N</mml:mi><mml:msub><mml:mi mathvariant=normal>H</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mi>y</mml:mi></mml:msub><mml:mi mathvariant=normal>C</mml:mi><mml:msub><mml:mi mathvariant=normal>s</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi>FeSe</mml:mi></mml:mrow></mml:math>" @default.
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- W2319310586 doi "https://doi.org/10.1103/physrevb.93.104508" @default.
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