Study of magnetic excitation spectra of several Fe-pnictide systems

M. Sato, T. Kawamata, Y. Kobayashi, Y. Yasui, T. Iida, K. Suzuki, M. Itoh, T. Moyoshi, K. Motoya, R. Kajimoto, M. Nakamura, Y. Inamura, M. Arai

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2 Citations (Scopus)


Magnetic excitation spectra χ" (Q, ΔE) have been measured for several Fe-pnictides including Ca-Fe-Pt-As system (Tc ∼30 K), one of new superconducting systems with FeAs planes. For the Ca-Fe-Pt-As system, data were taken with the neutron spectrometer 4SEASONS at J-PARC for a large crystal. The spectral weight χ" (Q, ΔE) of this new system observed at the M point in the reciprocal space is enhanced with decreasing temperature T through Tc in the broad energy (ΔE) region around ∼12.5 meV. However, it seems not to be significant as compared with the sharp and strong enhancement in the Q and ΔE spaces expected for the S± symmetry, although the observed shape of χ"(Q, ΔE) is not masked by the resolution effect, indicating the result seems to be hard to explain, unless the S++ symmetry is introduced.

Original languageEnglish
Article number022105
JournalJournal of Physics: Conference Series
Issue numberPART 2
Publication statusPublished - 2012
Event26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China
Duration: 2011 Aug 102011 Aug 17

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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