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Energy-gap driven low-temperature magnetic and transport properties in Cr1/3MS2(M = Nb, Ta)

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Hicken, T. J., Hawkhead, Z., Wilson, M. N., Huddart, B. M., Hall, A. E., Balakrishnan, Geetha, Wang, C., Pratt, F. L., Clark, S. J. and Lancaster, T. (2022) Energy-gap driven low-temperature magnetic and transport properties in Cr1/3MS2(M = Nb, Ta). Physical Review B, 105 (6). L060407. doi:10.1103/PhysRevB.105.L060407 ISSN 2469-9950.

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Official URL: http://dx.doi.org/10.1103/PhysRevB.105.L060407

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Abstract

The helimagnets Cr1/3MS2 (M = Nb or Ta) have attracted renewed attention due to the discovery of a chiral soliton lattice (CSL) stabilized in an applied magnetic field, but reports of unusual low-temperature transport and magnetic properties in this system lack a unifying explanation. Here, we present electronic structure calculations that demonstrate the materials are half metals. There is also a gaplike feature (width in range 40–100 meV) in the density of states of one spin channel. This electronic structure explains the low-temperature electronic and magnetic properties of Cr1/3MS2 (M = Nb or Ta), with the gaplike feature particularly important for explaining the magnetic behavior. Our magnetometry measurements confirm the existence of this gap. Dynamic spin fluctuations driven by excitations across this gap are seen over a wide range of frequencies (0.1 Hz to MHz) with ac susceptibility and muon-spin relaxation (μ+SR) measurements. We show further how effects due to the CSL in Cr1/3NbS2, as detected with μ+SR, dominate over the gap driven magnetism when the CSL is stabilized as the majority phase.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Transition metals , Transition metals -- Magnetic properties, Transition metals -- Transport properties , Muon spin rotation, Magnetic materials , Muons
Journal or Publication Title: Physical Review B
Publisher: American Physical Society
ISSN: 2469-9950
Official Date: 1 February 2022
Dates:
DateEvent
1 February 2022Published
22 January 2022Available
8 February 2022Accepted
Volume: 105
Number: 6
Article Number: L060407
DOI: 10.1103/PhysRevB.105.L060407
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: ©2022 American Physical Society
Date of first compliant deposit: 4 March 2022
Date of first compliant Open Access: 7 March 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/N032128/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/N024028/1 [EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P022782/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
UNSPECIFIED[NSERC] Natural Sciences and Engineering Research Council of Canadahttp://dx.doi.org/10.13039/501100000038

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