Switching of Intra-orbital Spin Excitations in Electron-doped Iron Pnictide Superconductors
Switching of Intra-orbital Spin Excitations in Electron-doped Iron Pnictide Superconductors
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DOI：
10.1103/physrevb.88.060501
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发表时间：
2013-07
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影响因子：
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通讯作者：
S. Iimura;S. Matsuishi;M. Miyakawa;T. Taniguchi;Katsuhiro Suzuki;H. Usui;K. Kuroki;R. Kajimoto;M. Nakamura;Y. Inamura;K. Ikeuchi;S. Ji;Hideo Hosono
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文献类型：
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作者：
S. Iimura;S. Matsuishi;M. Miyakawa;T. Taniguchi;Katsuhiro Suzuki;H. Usui;K. Kuroki;R. Kajimoto;M. Nakamura;Y. Inamura;K. Ikeuchi;S. Ji;Hideo Hosono
研究了双超导穹顶系统LaFeAsO1-xDx的磁激发与掺杂的关系。利用非弹性中子散射，在x=0.1和0.4附近的两个超导穹顶下观察到不同波数的自旋涨落，但在x=0.2时与T_c谷相对应的自旋涨落消失。理论计算表明，由于电子掺杂使Fe-3dYZ、ZX和3dX2-Y2中的两个轨道内嵌套发生了转换，合理地解释了自旋涨落的特征掺杂依赖关系。这些结果表明，多轨道性质在铁磷酸盐超导体的T_c掺杂和/或材料依赖性中起着重要作用。
We investigate the doping dependence of the magnetic excitations in two-superconducting-dome-system LaFeAsO1-xDx. Using inelastic neutron scattering, spin fluctuations at different wavenumbers were observed under both superconducting domes around x = 0.1 and 0.4, but vanished at x = 0.2 corresponding to the Tc valley. Theoretical calculations indicate that the characteristic doping dependence of spin fluctuations is rationally explained as a consequence of the switching of the two intra-orbital nestings within Fe-3dYZ, ZX and 3dX2-Y2 by electron doping. The present results imply that the multi-orbital nature plays an important role in the doping and / or material dependence of the Tc of the iron pnictide superconductors.