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.
|Journal||Journal of Physics: Conference Series|
|Issue number||PART 2|
|Publication status||Published - 2012|
|Event||26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China|
Duration: 2011 Aug 10 → 2011 Aug 17
ASJC Scopus subject areas
- Physics and Astronomy(all)