The spin gap and normal-state spin fluctuations in Rb2Fe4Se5
Last year, we reported the observation of a spin resonance in the superconducting phase of Rb2Fe4Se5, which represents a recently discovered family of ferrochalcogenide superconductors with a Tc of 32 K. Despite the phase separation persistent in all such samples, we could disentangle the strong spin-wave intensity of the insulating majority phase from the weaker magnetic signal of the metallic/superconducting minority phase by subtracting the INS data measured above and below Tc. In a more recent experiment at IN8, we have also measured the spectra separately for the normal and superconducting states down to 6 meV, revealing for the first time the spin gap, which opens up below Tc due to the transfer of the low-energy spectral weight to the resonance energy. The normal-state response also showed an unexpected pseudogap-like anomaly that was not found in other Fe-based systems. Here we suggest to extend these measurements to lower energies using a cold-neutron spectrometer in order to verify if the sum rule holds for the transferred spectral weight across Tc, and to get more insight into the nature of the spin pseudogap and its characteristic temperature scale in the same sample.
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Dmytro Inosov; FRIEMEL Gerd; GHAMBASHIDZE Giorgi; IVANOV Alexandre; JANG Hoyoung and KEIMER Bernhard. (2013). The spin gap and normal-state spin fluctuations in Rb2Fe4Se5. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1248
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