NMR studies of the helical antiferromagnetic compound EuCo2P2

N. Higa, Q. P. Ding, F. Kubota, H. Uehara, M. Yogi, Y. Furukawa, N. S. Sangeetha, D. C. Johnston, A. Nakamura, M. Hedo, T. Nakama, Y. Ōnuki

Research output: Contribution to journalArticlepeer-review

Abstract

In EuCo2P2, 4f electron spins of Eu2+ ions order antiferromagnetically below a Néel temperature TN=66.5K. The magnetic structure below TN was reported to be helical with the helix axis along the c-axis from the neutron diffraction study. We report the results of 153Eu, 59Co and 31P nuclear magnetic resonance (NMR) measurements on EuCo2P2 using a single crystal and a powdered sample. In the antiferromagnetic (AFM) state, we succeeded in observing 153Eu, 59Co and 31P NMR spectra in zero magnetic field. The sharp 153Eu zero field NMR (ZF NMR) lines indicate homogeneous Eu ordered moment. The 59Co and 31P ZF NMR spectra showed an asymmetric spectral shape, indicating a distribution of the internal magnetic induction at each nuclear position. The AFM propagation vector k characterizing the helical AFM state can be determined from the internal magnetic induction at Co site. We have determined the model-independent value of the AFM propagation vector k distributed from (0, 0, 0.86)2π/c to (0, 0, 0.73)2π/c, where c is the lattice parameter.

Original languageEnglish
Pages (from-to)384-387
Number of pages4
JournalPhysica B: Condensed Matter
Volume536
DOIs
Publication statusPublished - 2018 May 1

Keywords

  • Antiferromagnetic propagation vector
  • EuCoP
  • Helical antiferromagnet
  • NMR

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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