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Open AccessArticle

Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4

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Institute of Crystallography, CNR, via Salaria Km 29.300, 00015 Monterotondo, Roma, Italy
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Institute for Metallic Materials, Leibniz IFW Dresden, 01069 Dresden, Germany
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Elettra Sincrotrone Trieste. Strada Statale 14 - km 163.5, AREA Science Park, I-34149 Basovizza, Trieste, Italy
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Rome International Center for Materials Science Superstripes RICMASS, Via dei Sabelli 119A, 00185 Roma, Italy
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Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA94720, USA
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School of Materials Science and Technology, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India
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Faculty of Mathematics and Natural Sciences Intitut Teknologi Bandung, Jl. Ganesha 10 Bandung, Jawa Barat 40132, Indonesia
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II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germay
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Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute Methods and Instrumentation in Synchrotron Radiation Research, Albert-Einstein-Str. 15, 12489 Berlin, Germany
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Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany
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European X-ray Free-Electron Laser Facility GmbH Holzkoppel 4, 22869 Schenefeld, Germany
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Authors to whom correspondence should be addressed.
Condens. Matter 2019, 4(3), 77; https://doi.org/10.3390/condmat4030077
Received: 9 July 2019 / Revised: 5 August 2019 / Accepted: 8 August 2019 / Published: 10 August 2019
(This article belongs to the Special Issue Selected Papers from Quantum Complex Matter 2018)
In several strongly correlated electron systems, the short range ordering of defects, charge and local lattice distortions are found to show complex inhomogeneous spatial distributions. There is growing evidence that such inhomogeneity plays a fundamental role in unique functionality of quantum complex materials. La1.72Sr0.28NiO4 is a prototypical strongly correlated perovskite showing spin stripes order. In this work we present the spatial distribution of the spin order inhomogeneity by applying micro X-ray diffraction to La1.72Sr0.28NiO4, mapping the spin-density-wave order below the 120 K onset temperature. We find that the spin-density-wave order shows the formation of nanoscale puddles with large spatial fluctuations. The nano-puddle density changes on the microscopic scale forming a multiscale phase separation extending from nanoscale to micron scale with scale-free distribution. Indeed spin-density-wave striped puddles are disconnected by spatial regions with negligible spin-density-wave order. The present work highlights the complex spatial nanoscale phase separation of spin stripes in nickelate perovskites and opens new perspectives of local spin order control by strain. View Full-Text
Keywords: nanoscale phase separation; spin stripes; nickelates; quantum complex materials nanoscale phase separation; spin stripes; nickelates; quantum complex materials
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Campi, G.; Poccia, N.; Joseph, B.; Bianconi, A.; Mishra, S.; Lee, J.; Roy, S.; Nugroho, A.A.; Buchholz, M.; Braden, M.; Trabant, C.; Zozulya, A.; Müller, L.; Viefhaus, J.; Schüßler-Langeheine, C.; Sprung, M.; Ricci, A. Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4. Condens. Matter 2019, 4, 77.

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