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μSR study of stoichiometric NbFe2

Margineda, Daniel, Duffy, J.A., Taylor, J.W. and Giblin, Sean 2017. μSR study of stoichiometric NbFe2. Physica B: Condensed matter 504 , pp. 121-126. 10.1016/j.physb.2016.10.014

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Abstract

The magnetic ground state of nominally stoichiometric single crystalline NbFe2 is investigated by bulk magnetisation and muon spin relaxation techniques. Magnetic order clearly emerges below the critical temperature TN=10.3 K and is dominated by randomly orientated quasi-static moments. The local field distribution observed by muons can be explained by the phenomenological Gaussian-broadened-Gaussian Kubo Toyabe relaxation function. The observed short range order could be used to describe a new magnetic ground state, but a helical spin density wave with an incommensurate amplitude modulation cannot be ruled out. The sensitivity of μSR to the local magnetic field distribution in the vicinity of the quantum critical point (QCP) in NbFe2 is clearly demonstrated via comparison with already published work. This suggests detailed measurements of the muon relaxation as the QCP is approached will reveal further details of the field distribution and fluctuations in Nb1−yFe2+yNb1−yFe2+y.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Muon spin relaxation; Quantum critical point; Spin density wave
Publisher: Elsevier
ISSN: 0921-4526
Date of First Compliant Deposit: 29 March 2017
Date of Acceptance: 11 October 2016
Last Modified: 15 Oct 2017 01:45
URI: http://orca.cf.ac.uk/id/eprint/99458

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