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Title: Neutron Powder Diffraction Study on the Magnetic Structure of NdPd 5 Al 2

The magnetic structure of NdPd 5Al 2 has been studied by neutron powder diffraction. Here, we observed the magnetic reflections with the modulation vector q=(1/2,0,0)q=(1/2,0,0) below the ordering temperature T N. We also found a collinear magnetic structure with a Nd moment of 2.7(3) μB at 0.5 K parallel to the c-axis, where the ferromagnetically ordered a-planes stack with a four-Nd-layer period having a ++-- sequence along the a-direction with the distance between adjacent Nd layers equal to a/2 (magnetic space group P anma). This “stripe”-like modulation is very similar to that in CePd 5Al 2 with q=(0.235,0.235,0)q=(0.235,0.235,0) with the Ce moment parallel to the c-axis. These structures with in-plane modulation are a consequence of the two-dimensional nature of the Fermi surface topology in this family, originating from the unique crystal structure with a very long tetragonal unit cell and a large distance of >7 Å between the rare-earth layers separated by two Pd and one Al layers.
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  1. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  2. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
  3. Univ. of Tokyo (Japan)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of the Physical Society of Japan
Additional Journal Information:
Journal Volume: 86; Journal Issue: 3; Journal ID: ISSN 0031-9015
Physical Society of Japan
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; NdPd5Al2; NpPd5Al2; magnetic structure; neutron diffraction
OSTI Identifier: