μSR study of stoichiometric NbFe₂

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• 作者：D. Margineda^a ; ^{marginedad@cardiff.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; J.A. Duffy^b ; J.W. Taylor^c ; S.R. Giblin^a ;
• 关键词：Muon spin relaxation ; Quantum critical point ; Spin density wave
• 刊名：Physica B: Physics of Condensed Matter
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：504
• 期：Complete
• 页码：121-126
• 全文大小：789 K

文摘

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 T_N=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 Nb_1−yFe_2+y${\mathrm{Nb}}_{1-y}{\mathrm{Fe}}_{2+y}$.