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- W4229033185 abstract "We studied the band structure of $mathrm{Nd}phantom{rule{0.16em}{0ex}}mathrm{Fe}phantom{rule{0.16em}{0ex}}{mathrm{As}}_{1ensuremath{-}x}{mathrm{P}}_{x}{mathrm{O}}_{0.9}{mathrm{F}}_{0.1}$ ($x=0$, 0.2, 0.4, and 0.6) using angle-resolved photoemission spectroscopy (ARPES) measurements. Two of the hole bands, ${ensuremath{alpha}}_{1}$ $({d}_{xz})$ and ${ensuremath{alpha}}_{3}$ $({d}_{{z}^{2}})$, were observed at the Brillouin zone center in the $P$-polarized light configuration, while the other two hole bands, ${ensuremath{alpha}}_{2}$ $({d}_{yz})$ and ensuremath{gamma} $({d}_{xy})$, were observed in the $S$-polarized alternative. The observed ensuremath{gamma} band shifts downward as $x$ increases, which is consistent with the theoretical prediction for the change in bond angle of As/P-Fe-As/P. Furthermore, a small amount of the ${d}_{xy}$ orbital component was observed at the same binding energy as that of the top of the ${ensuremath{alpha}}_{1}$ band, thus indicating the band reconstruction of the originally degenerate ${ensuremath{alpha}}_{1}$ and ${ensuremath{alpha}}_{2}$ $({d}_{xz}/{d}_{yz})$ bands by the unoccupied ${d}_{xy}$ band. The change in the energy level of the ${ensuremath{alpha}}_{1}$ band top with ${d}_{xy}$ orbital character is accompanied by a ${T}_{mathrm{c}}$ upturn at $0.2<x<0.4$. The ${T}_{mathrm{c}}$ continues to increase as the ${ensuremath{alpha}}_{1}$ band shifts downward, crossing the Fermi level. The incipient band with the ${d}_{xy}$ orbital character on its top could be an important ingredient for high ${T}_{mathrm{c}}$ 1111-type iron-based superconductors." @default.
- W4229033185 created "2022-05-08" @default.
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- W4229033185 date "2022-05-06" @default.
- W4229033185 modified "2023-09-26" @default.
- W4229033185 title "Observation of bands with <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>d</mml:mi><mml:mrow><mml:mi>x</mml:mi><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:math> orbital character near the Fermi level in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi mathvariant=normal>NdFeAs</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant=normal>P</mml:mi><mml:mi>x</mml:mi></…" @default.
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- W4229033185 doi "https://doi.org/10.1103/physrevb.105.205106" @default.
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