NMR studies of the incommensurate helical antiferromagnet EuCo2P2: Determination of antiferromagnetic propagation vector

Nonoka Higa, Qing-Ping Ding, Mamoru Yogi, N. S. Sangeetha, Masato Hedo, Takao Nakama, Yoshichika Ōnuki, D. C. Johnston, and Yuji Furukawa
Phys. Rev. B 96, 024405 – Published 6 July 2017

Abstract

Recently, Q.-P. Ding et al. [Phys. Rev. B 95, 184404 (2017)] reported that their nuclear magnetic resonance (NMR) study on EuCo2As2 successfully characterized the antiferromagnetic (AFM) propagation vector of the incommensurate helix AFM state, showing that NMR is a unique tool for determination of the spin structures in incommensurate helical AFMs. Motivated by this work, we have carried out Eu153, P31, and Co59 NMR measurements on the helical antiferromagnet EuCo2P2 with an AFM ordering temperature TN=66.5 K. An incommensurate helical AFM structure was clearly confirmed by Eu153 and P31 NMR spectra on single-crystalline EuCo2P2 in zero magnetic field at 1.6 K and its external magnetic field dependence. Furthermore, based on Co59 NMR data in both the paramagnetic and incommensurate AFM states, we have determined the model-independent value of the AFM propagation vector k=(0,0,0.73±0.09)2π/c, where c is the c-axis lattice parameter. The temperature dependence of k is also discussed.

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  • Received 27 April 2017
  • Revised 15 June 2017

DOI:https://doi.org/10.1103/PhysRevB.96.024405

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Nonoka Higa1,2, Qing-Ping Ding1, Mamoru Yogi2, N. S. Sangeetha1, Masato Hedo2, Takao Nakama2, Yoshichika Ōnuki2, D. C. Johnston1, and Yuji Furukawa1

  • 1Ames Laboratory, U.S. Department of Energy, and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus, Okinawa 903-0213, Japan

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Issue

Vol. 96, Iss. 2 — 1 July 2017

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