ISIS Neutron and Muon Source Data Journal

Low-energy excitations near a field induced magnetic quantum-critical line in Nb1-yFe2+y

Abstract: Our previous neutron scattering on ferromagnetic (FM) Nb1-yFe2+y revealed that chemical-composition (y) tuning at zero field leads to a FM quantum-critical point (QCP) masked by a spin-density-wave (SDW). The excitation spectrum at zero field is characterised by enhanced soft modes with an exotic dispersion that reflects the presence of emerging SDW order. In contrast, transverse-field tuning of a FM Nb1-yFe2+y sample has revealed an unmasked FM QCP with a more conventional excitation spectrum expected by spin-fluctuation theory. A plausible assumption is that the unmasked FM QCP belongs to a transverse-field induced quantum critical line, which a critical concentration (y_c) terminates in a quantum multi-critical point. We propose to explore the evolution of the low-energy excitation spectrum along this quantum critical line and ask for 6 days of beamtime.

Principal Investigator: Dr Philipp Niklowitz
Experimenter: Mr Thomas Poulis
Experimenter: Professor Christian Pfleiderer
Experimenter: Mr GIRI MANI
Experimenter: Professor Malte Grosche
Local Contact: Dr David Voneshen

DOI: 10.5286/ISIS.E.RB2210336

ISIS Experiment Number: RB2210336

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 Philipp Niklowitz et al; (2022): Low-energy excitations near a field induced magnetic quantum-critical line in Nb1-yFe2+y, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2210336

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