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Title: Neutron Diffraction Study of Parasitic Nd-Moment Order in the Checkerboard-Type Phase Nd1.3Sr0.7NiO4

In this paper, the Nd-moment order in the layered nickelate Nd2-xSrxNiO4 (x = 0.7) has been investigated by performing a neutron diffraction experiment using a single crystal sample. First, the checkerboard (CB)-type charge order was confirmed by observing the temperature dependence of the nuclear superlattice peak at Q=(5,0,0) between 1.9 and 300 K, which indicates that the transition temperature of the CB-type charge order is above 300 K. Magnetic superlattice peaks with the propagation vector k=(1-ε,0,1) appear below 67 K, and the value of ε was determined to be 0.455 in good agreement with previous studies. The intensity of the magnetic superlattice peaks appearing below 67 K shows a sharp increase below ≈20 K. This behavior indicates that the Nd moments freeze under the influence of the Ni ordering. The CB-type antiferromagnetic (AFM) Ni order in the NiO2 layers is stacked antiferromagnetically in the c-axis direction, while the Nd moments in the Nd/SrO2 layers are coupled antiferromagnetically with the Ni moments. Finally, the Nd moments are parallel to the c-axis, while the Ni moments are canted towards the c-axis direction from the basal ab-plane at low temperatures where the Nd moments are well ordered.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Univ. of Tokyo, Tokai (Japan). Inst. for Solid-State Physics. Neutron Science Lab.
  2. Univ. of Tokyo (Japan). Inst. for Solid-State Physics. Neutron Science Lab.
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  4. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Materials and Life Science Division. J-PARC Center
  5. Univ. of Tokyo (Japan). Dept. of Applied Physics
  6. Univ. of Tokyo (Japan). Dept. of Applied Physics; RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
Publication Date:
OSTI Identifier:
1265510
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of the Physical Society of Japan
Additional Journal Information:
Journal Volume: 84; Journal Issue: 6; Journal ID: ISSN 0031-9015
Publisher:
Physical Society of Japan
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE