Complex magnetic order in nickelate slabs
| Autor: | Alex Frano, Bernhard Keimer, Gennady Logvenov, Robert J. Green, Matthieu Le Tacon, Zhicheng Zhong, M. Hepting, Georg Cristani, Jean-Marc Triscone, Marta Gibert, George A. Sawatzky, Ronny Sutarto, Y. Eren Suyolcu, Eva Benckiser, Philipp Hansmann, S. Macke, Feizhou He, Martin Bluschke, Peter A. van Aken, Sara Catalano, Yi Wang |
|---|---|
| Přispěvatelé: | University of Zurich, Benckiser, E |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Magnetic moment Scattering Magnetism 530 Physics FOS: Physical sciences General Physics and Astronomy 02 engineering and technology 10192 Physics Institute 021001 nanoscience & nanotechnology 01 natural sciences 3100 General Physics and Astronomy Condensed Matter - Strongly Correlated Electrons Amplitude 0103 physical sciences Spin model Density functional theory 010306 general physics 0210 nano-technology Ternary operation Spin-½ |
| Popis: | Magnetic ordering phenomena have a profound influence on the macroscopic properties of correlated-electron materials, but their realistic prediction remains a formidable challenge. An archetypical example is the ternary nickel oxide system RNiO3 (R = rare earth), where the period-four magnetic order with proposals of collinear and non-collinear structures and the amplitude of magnetic moments on different Ni sublattices have been subjects of debate for decades. Here we introduce an elementary model system - NdNiO3 slabs embedded in a non-magnetic NdGaO3 matrix - and use polarized resonant x-ray scattering (RXS) to show that both collinear and non-collinear magnetic structures can be realized, depending on the slab thickness. The crossover between both spin structures is correctly predicted by density functional theory and can be qualitatively understood in a low-energy spin model. We further demonstrate that the amplitude ratio of magnetic moments in neighboring NiO6 octahedra can be accurately determined by RXS in combination with a correlated double cluster model. Targeted synthesis of model systems with controlled thickness and synergistic application of polarized RXS and ab-initio theory thus provide new perspectives for research on complex magnetism, in analogy to two-dimensional materials created by exfoliation. This is the accepted version of the manuscript. The revised manuscript according to peer reviews was published online in Nature Physics on July 23, 2018 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|