ISIS Neutron and Muon Source Data Journal

Origin of the magnetism in heavily electron-doped iron-selenide superconductor

Abstract: Elucidating the nature of magnetism in a high temperature superconductor is important. Our previous neutron measurements at low temperature revealed a resonance mode at Q = (pi, 0.62*pi) in heavily electron doped FeSe superconductor Li0.8Fe0.2ODFeSe (Tc = 41 K), which is different from that in FeAs superconductors. Most notably, we show that the spin excitations disperse outward at low energies and then inward at higher energies which is quite unique as well. These results suggest that the spin excitations might have different origins here which will lead to different temperature dependence. Very recently, our neutron scattering experiment on a triple axis spectrometer showed that the low energy spin excitation dispersion is indeed highly temperature dependent. Here we propose to measure the temperature dependence of high energy spin excitations from 50 K to 300 K in Li0.8Fe0.2ODFeSe.

Principal Investigator: Mr Jun Zhao
Experimenter: Dr Yu Feng
Experimenter: Professor Qisi Wang
Experimenter: Miss Die Hu
Local Contact: Dr Devashi Adroja
Experimenter: Dr Yao Shen

DOI: 10.5286/ISIS.E.RB1710265

ISIS Experiment Number: RB1710265

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Mr Jun Zhao et al; (2017): Origin of the magnetism in heavily electron-doped iron-selenide superconductor, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1710265

Data is released under the CC-BY-4.0 license.