NMR studies of the helical antiferromagnetic compound EuCo2P2

Date
2018-05-01
Authors
Higa, N.
Ding, Qing-Ping
Kubota, F.
Uehara, H.
Yogi, M.
Furukawa, Yuji
Sangeetha, N.
Johnston, David
Nakamura, A.
Hedo, M.
Nakama, T.
Onuki, Y.
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Ames Laboratory
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Physics and Astronomy
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Abstract

In EuCo2P2, 4f electron spins of Eu2+ ions order antiferromagnetically below a Néel temperature . The magnetic structure below 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.

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EuCo2P2, Helical antiferromagnet, Antiferromagnetic propagation vector, NMR
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