ISIS Neutron and Muon Source Data Journal

Coupled magnetic and nematic fluctuations in S-doped FeSe

Abstract: FeSe has a superconducting ordering temperature Tc = 9K. Superconductivity coexists with nematic order which is manifest most clearly by an orthorhombic distortion which sets in at Ts = 90K. Substitution of S for Se has a relatively minor effect on Tc but strongly suppresses Ts, such that Ts = 0 at 17% substitution. This point has been identified as a nematic quantum critical point, where strong nematic fluctuations are observed. The proposed experiment aims to test whether nematic fluctuations couple to magnetic fluctuations, which are widely believed to be involved in the pairing mechanism in the iron-based superconductors. We shall do this by comparing the powder-averaged magnetic fluctuation spectrum in a sample at the quantum critical composition with that in a sample with x = 0, which has no nematic fluctuations but strong magnetic fluctuations.

Principal Investigator: Professor Andrew Boothroyd
Experimenter: Dr Jian Rui Soh
Experimenter: Mr jinzhao sun [Deactivated]
Experimenter: Dr Simon Clarke
Experimenter: Professor Marein Rahn
Experimenter: Dr Henrik Jacobsen
Local Contact: Dr Tatiana Guidi

DOI: 10.5286/ISIS.E.RB1910642

ISIS Experiment Number: RB1910642

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:
Professor Andrew Boothroyd et al; (2019): Coupled magnetic and nematic fluctuations in S-doped FeSe, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1910642

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