| Autor: |
Zhang J; Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States. junjie@sdu.edu.cn.; Institute of Crystal Materials, State Key Laboratory of Crystal Materials, Shandong University, 250100, Jinan, Shandong, China. junjie@sdu.edu.cn., Phelan D; Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States., Botana AS; Department of Physics, Arizona State University, Tempe, AZ, 85287, United States., Chen YS; ChemMatCARS, The University of Chicago, Lemont, IL, 60439, United States., Zheng H; Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States., Krogstad M; Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States., Wang SG; ChemMatCARS, The University of Chicago, Lemont, IL, 60439, United States., Qiu Y; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, United States., Rodriguez-Rivera JA; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, United States.; Department of Materials Science, University of Maryland, College Park, MD, 20742, United States., Osborn R; Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States., Rosenkranz S; Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States., Norman MR; Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States., Mitchell JF; Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, United States. mitchell@anl.gov. |
| Abstrakt: |
Nickelates are a rich class of materials, ranging from insulating magnets to superconductors. But for stoichiometric materials, insulating behavior is the norm, as for most late transition metal oxides. Notable exceptions are the 3D perovskite LaNiO 3 , an unconventional paramagnetic metal, and the layered Ruddlesden-Popper phases R 4 Ni 3 O 10 , (R = La, Pr, Nd). The latter are particularly intriguing because they exhibit an unusual metal-to-metal transition. Here, we demonstrate that this transition results from an incommensurate density wave with both charge and magnetic character that lies closer in its behavior to the metallic density wave seen in chromium metal than the insulating stripes typically found in single-layer nickelates like La 2-x Sr x NiO 4 . We identify these intertwined density waves as being Fermi surface-driven, revealing a novel ordering mechanism in this nickelate that reflects a coupling among charge, spin, and lattice degrees of freedom that differs not only from the single-layer materials, but from the 3D perovskites as well. |
