Monday, July 29, 2013

1307.7016 (Soshi Iimura et al.)

Switching of intra-orbital spin excitations in electron-doped iron
pnictide superconductors

Soshi Iimura, Satoru Matsuishi, Masashi Miyakawa, Takashi Taniguchi, Katsuhiro Suzuki, Hidetomo Usui, Kazuhiko Kuroki, Ryoichi Kajimoto, Mitsutaka Nakamura, Yasuhiro Inamura, Kazuhiko Ikeuchi, Sungdae Ji, Hideo Hosono
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.
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