Long-range magnetic order of La<sub>2</sub>Ni<sub>7</sub>
ORAL
Abstract
La2Ni7 has been recently shown to possess magnetic states associated with low-moment, itinerant Ni ordering.[1] Employing single-crystal neutron diffraction in zero magnetic field, we found one commensurate (Cc) and two incommensurate (ICab and ICc) antiferromagnetic phases below 42.8(5), 58(1), and 62(1) K, respectively. The transition temperatures are consistent with the H-T phase diagrams shown in Ref. [1]. Although ICab and ICc both have the same temperature dependent propagation vector, ICc has magnetic moments aligned colinear to c whereas ICab has a significant magnetic moment component in the ab-plane. We found the phase transition to Cc to be first-order with a magnetic structure consistent with a triangular-wave modulated spin-density wave with magnetic moments colinear along c and propagation vector (0 0 1).
[1] Ribeiro, Raquel A., et al. arXiv:2110.06349 (2021).
[1] Ribeiro, Raquel A., et al. arXiv:2110.06349 (2021).
*Work at Ames Laboratory was supported by the U.S. DOE, BES, DMSE. Ames Laboratory is operated for the U.S. DOE by Iowa State University under Contract No. DE-AC02-07CH11358. RAR is also supported by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant GBMF411. This research used resources at HFIR, a U. S. DOE, Office of Science User Facility operated by Oak Ridge National Laboratory.
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Presenters
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John M Wilde
- Iowa State University
- Iowa State University/Ames Laboratory