NMR studies of the helical antiferromagnetic compound EuCo2P2

Higa, N.; Ding, Q. -P.; Johnston, D. C.; Uehara, H.; Yogi, M.; Furukawa, Y.; Sangeetha, N. S.; Johnston, D. C.; Nakamura, A.; Hedo, M.; Nakama, T.; Onuki, Y.

doi:10.1016/j.physb.2017.09.065

Title: NMR studies of the helical antiferromagnetic compound EuCo₂P₂

Abstract

In EuCo₂P₂, 4f electron spins of Eu²⁺ ions order antiferromagnetically below a Neel temperature T_N = 66.5K. The magnetic structure below T_N 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. In conclusion, 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.

Authors:

Higa, N. ^[1]; Ding, Q. -P. ^[2]; Johnston, D. C. ^[2]; Uehara, H. ^[3]; Yogi, M. ^[3]; Furukawa, Y. ^[2]; Sangeetha, N. S. ^[2]; Johnston, D. C. ^[2]; Nakamura, A. ^[4]; Hedo, M. ^[3]; Nakama, T. ^[3]; Onuki, Y. ^[3]

Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of Ryukyus, Okinawa (Japan)
Ames Lab. and Iowa State Univ., Ames, IA (United States)
Univ. of Ryukyus, Okinawa (Japan)
Tokoku Univ., Ibaraki (Japan)

Publication Date:: Mon Sep 18 00:00:00 EDT 2017

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1435748

Alternate Identifier(s):: OSTI ID: 1496333

Report Number(s):: IS-J-9656
Journal ID: ISSN 0921-4526; PII: S0921452617306506; TRN: US1900100

Grant/Contract Number:: AC02-07CH11358; JP15K21732; JP15H05885; JP16H01078

Resource Type:: Accepted Manuscript

Journal Name:: Physica. B, Condensed Matter

Additional Journal Information:: Journal Volume: 536; Journal Issue: C; Journal ID: ISSN 0921-4526

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; EuCo2P2; Helical antiferromagnet; Antiferromagnetic propagation vector; NMR

Citation Formats


                    Higa, N., Ding, Q. -P., Johnston, D. C., Uehara, H., Yogi, M., Furukawa, Y., Sangeetha, N. S., Johnston, D. C., Nakamura, A., Hedo, M., Nakama, T., and Onuki, Y. NMR studies of the helical antiferromagnetic compound EuCo2P2.  United States: N. p., 2017. 
Web.  doi:10.1016/j.physb.2017.09.065.

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                    Higa, N., Ding, Q. -P., Johnston, D. C., Uehara, H., Yogi, M., Furukawa, Y., Sangeetha, N. S., Johnston, D. C., Nakamura, A., Hedo, M., Nakama, T., & Onuki, Y. NMR studies of the helical antiferromagnetic compound EuCo2P2.  United States.  https://doi.org/10.1016/j.physb.2017.09.065

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                    Higa, N., Ding, Q. -P., Johnston, D. C., Uehara, H., Yogi, M., Furukawa, Y., Sangeetha, N. S., Johnston, D. C., Nakamura, A., Hedo, M., Nakama, T., and Onuki, Y. Mon .  
"NMR studies of the helical antiferromagnetic compound EuCo2P2".  United States.  https://doi.org/10.1016/j.physb.2017.09.065.  https://www.osti.gov/servlets/purl/1435748.

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@article{osti_1435748,

  title        = {NMR studies of the helical antiferromagnetic compound EuCo2P2},

  author       = {Higa, N. and Ding, Q. -P. and Johnston, D. C. and Uehara, H. and Yogi, M. and Furukawa, Y. and Sangeetha, N. S. and Johnston, D. C. and Nakamura, A. and Hedo, M. and Nakama, T. and Onuki, Y.},

  abstractNote = {In EuCo2P2, 4f electron spins of Eu2+ ions order antiferromagnetically below a Neel 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. In conclusion, 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.},

  doi          = {10.1016/j.physb.2017.09.065},

  journal      = {Physica. B, Condensed Matter},

  number       = C,

  volume       = 536,

  place        = {United States},

  year         = {Mon Sep 18 00:00:00 EDT 2017},

  month        = {Mon Sep 18 00:00:00 EDT 2017}

}

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Figure 1: Crystal and magnetic structures of EuCo₂P₂.

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Title: NMR studies of the helical antiferromagnetic compound EuCo2P2

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Title: NMR studies of the helical antiferromagnetic compound EuCo₂P₂