ISIS Neutron and Muon Source Data Journal

Probing the vortex lattice in the iron-based superconductor FeSe

Abstract: Magnetic field can penetrate a Type-II superconductor to form a vortex lattice (VL) due to the mutual repulsion between the vortices. VL is very important as it contains rich information about the superconductivity (SC). FeSe, despite being the structurally simplest iron-based superconductor, hosts very exotic SC, with the Tc varies from ~ 8 K in the bulk to ~ 110 K in the single-layer limit. The problem is further complicated by the strong interplay between SC, magnetism and nematicity. A recent high magnetic field study indicated a novel field-induced Bardeen–Cooper–Schrieffer (BCS) to Bose–Einstein condensate (BEC) crossover below ~ 1.1 K. Here, we propose to use small-angle neutron scattering to probe the VL in FeSe. By exploring its entire SC phase diagram, we aim to understand the SC and its coupling with nematicity, as well as verify the BCS-BEC crossover scenario in FeSe.

Principal Investigator: Dr Lingjia Shen
Experimenter: Professor Elizabeth Blackburn
Experimenter: Professor Ted Forgan
Experimenter: Mr Jun Zhao
Local Contact: Dr Diego Alba Venero
Experimenter: Miss Emma Campillo
Local Contact: Dr Russell Ewings
Experimenter: Mr Claudiu Bulbucan

DOI: 10.5286/ISIS.E.RB1910231

ISIS Experiment Number: RB1910231

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:
Dr Lingjia Shen et al; (2019): Probing the vortex lattice in the iron-based superconductor FeSe, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1910231

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