ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Local Investigation of the Altermagnetic Phase in Co0.25TaSe2 through Muon Spin Relaxation
Abstract: Altermagnetism, a recently discovered magnetic order bridging ferromagnetism and antiferromagnetism, is highly promising for next-generation spintronics due to its spin-polarized bands without net magnetization. Intercalated transition metal dichalcogenides (ITMDs) like Co0.25TaSe2 (T_N ~ 125 K) are emerging benchmark systems for this phenomenon, exhibiting A-type antiferromagnetic order and spin-split electronic bands. However, bulk measurements leave critical microscopic details unresolved, specifically the degree of magnetic homogeneity, the volume fraction of the ordered state, and the presence of precursor spin fluctuations. We propose zero-field (ZF) and longitudinal-field (LF) muon spin relaxation (muSR) experiments on a high-purity powder sample of Co0.25TaSe2 using the HIFI instrument at ISIS. muSR is the essential local probe required to quantitatively determine the internal magnetic field distribution, distinguish between static and dynamic magnetic components, and search for potential altermagnetic fluctuations above T_N. This research will provide the necessary microscopic foundation to establish Co0.25TaSe2 as a core platform for understanding the interplay of magnetism, symmetry, and itinerant electronic states in this new class of materials. We request 2 days (6 shifts) of beam time to complete the comprehensive ZF temperature scan (20 - 200 K) and the targeted LF studies.
Public release date: 28 March 2029
Principal Investigator: Dr Tathamay Basu
Experimenter: Dr Devashi Adroja
Experimenter: Mr TUHIN DEBNATH
Local Contact: Dr Mark Telling
Experimenter: Mr Gourab Roy
Experimenter: Miss Ekta Kushwaha
Experimenter: Mr Mohit Kumar Kumar
Experimenter: Mr Sayan Ghosh
DOI: 10.5286/ISIS.E.RB2610389-1
Parent DOI: 10.5286/ISIS.E.RB2610389
ISIS Experiment Number: RB2610389
Part Number: 1
This dataset is NOT yet publicly available.
The release date is: 28 March 2029
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Date of Experiment: 02 March 2026
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
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publication is as:
[author], [date], [title], [publisher],
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For Example:
Dr Tathamay Basu et al; (2026): Local Investigation of the Altermagnetic Phase in Co0.25TaSe2 through Muon Spin Relaxation, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2610389-1
Data is released under the CC-BY-4.0 license.
