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NMR determination of an incommensurate helical antiferromagnetic structure in EuCo2As2

TitleNMR determination of an incommensurate helical antiferromagnetic structure in EuCo2As2
Publication TypeJournal Article
Year of Publication2017
AuthorsDing, QP, Higa, N, Sangeetha, NS, Johnston, DC, Furukawa, Y
JournalPhysical Review B
Volume95
Pagination184404
Date Published05
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000400658000001
Keywordsphysics, superconductivity, transition
Abstract

We report Eu-153, As-75, and Co-59 nuclear magnetic resonance (NMR) results on EuCo2As2 single crystal. Observations of Eu-153 and As-75 NMR spectra in zero magnetic field at 4.3 K below an antiferromagnetic (AFM) ordering temperature T-N = 45 K and its external magnetic field dependence clearly evidence an incommensurate helical AFM structure in EuCo2As2. Furthermore, based on Co-59 NMR data in both the paramagnetic and the incommensurate AFM states, we have determined the model-independent value of the AFM propagation vector k = (0,0,0.73 +/- 0.07)2 pi/c, where c is the c lattice parameter. Thus the incommensurate helical AFM state was characterized by only NMR data with model-independent analyses, showing NMR to be a unique tool for determination of the spin structure in incommensurate helical AFMs.

DOI10.1103/PhysRevB.95.184404
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Complex States

Alternate JournalPhys. Rev. B