Spiral magnetic ordering of the Eu moments in EuNi2As2

W. T. Jin, N. Qureshi, Z. Bukowski, Y. Xiao, S. Nandi, M. Babij, Z. Fu, Y. Su, and Th. Brückel
Phys. Rev. B 99, 014425 – Published 22 January 2019

Abstract

The ground-state magnetic structure of EuNi2As2 was investigated by single-crystal neutron diffraction. At base temperature, the Eu2+ moments are found to form an incommensurate antiferromagnetic spiral-like structure with a magnetic propagation vector of k=(0,0,0.92). They align ferromagnetically in the ab plane with the moment size of 6.75(6) μB, but rotate spirally by 165.6(1) around the c axis from layer to layer. The magnetic order parameter in the critical region close to the ordering temperature TN=15 K shows critical behavior with a critical exponent of βEu=0.35(2), consistent with the three-dimensional Heisenberg model. Moreover, within the experimental uncertainty, our neutron data are consistent with a model in which the Ni sublattice is not magnetically ordered.

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  • Received 19 November 2018
  • Revised 13 January 2019

DOI:https://doi.org/10.1103/PhysRevB.99.014425

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

W. T. Jin1,*, N. Qureshi2, Z. Bukowski3, Y. Xiao4, S. Nandi5, M. Babij3, Z. Fu1, Y. Su1, and Th. Brückel6,1

  • 1Jülich Centre for Neutron Science JCNS at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85747 Garching, Germany
  • 2Institut Laue Langevin, 71 rue des Martyrs, BP156, 38042 Grenoble Cedex 9, France
  • 3Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-422 Wroclaw, Poland
  • 4School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen 518055, China
  • 5Department of Physics, Indian Institute of Technology, Kanpur 208016, India
  • 6Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

  • *jwt2006@gmail.com

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Vol. 99, Iss. 1 — 1 January 2019

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