ISIS Neutron and Muon Source Data Journal

Commensurate Magnetic and Superconducting Transitions in a Candidate Topological Superconductor

Abstract: We propose to understand the interplay between superconductivity and magnetism in the candidate topological superconductor heterostructure system composed of Cr-doped (Bi,Sb)2Te3 (CBST) and FeTe. CBST is a magnetic topological insulator while FeTe is an antiferromagnetic analogue of the well-know superconductor FeSe. Individually non-superconducting, these elements manifest an emergent interfacial superconductivity when interfaced. Our preliminary muon spin relaxation (µSR) data and scanning tunneling microscopy indicates that magnetism and topologically nontrivial surface states are preserved in the superconducting state. The combination of magnetism, superconductivity, topologically protected chiral surface states makes these systems ideal candidates for realizing Majorana physics. Even more interesting, our µSR data suggests that a transition to a henceforce unknown magnetic ground state in the FeTe is critical for supporting the superdoncutivity, raising the possibility that CBST/FeTe is a spin-triplet superconductor. It is of course critical to understand the magnetic transition revealed by µSR, and we consequently propose to perform thin film neutron diffraction on WISH to precisely identify how the magnetic ground state evolves across the superconducting transition.

Principal Investigator: Dr Alexander Grutter
Local Contact: Dr Pascal Manuel
Experimenter: Mr Brian Maranville
Experimenter: Dr Purnima Parvathy Balakrishnan
Experimenter: Dr Christy Kinane
Experimenter: Dr Andrew Caruana
Experimenter: Professor Cui-Zu Chang
Experimenter: Dr Hemian Yi

DOI: 10.5286/ISIS.E.RB2320064

ISIS Experiment Number: RB2320064

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 Alexander Grutter et al; (2024): Commensurate Magnetic and Superconducting Transitions in a Candidate Topological Superconductor, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2320064

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