Advances in the understanding of multiferroics through soft X-ray diffraction

Beale, T. A. W.; Wilkins, S. B.; Johnson, Roger A.; Prabhakaran, D.; Boothroyd, A. T.; Steadman, P.; Dhesi, S. S.; Hatton, P. D.

doi:10.1140/epjst/e2012-01610-7

Cited by 6 publications

(4 citation statements)

References 33 publications

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“…The anisotropy of polaron clusters in nickelates is assigned here to misfit strain [51,52] and orbital degrees of freedom [53][54][55]. The detection of the complex magnetic structures in strongly correlated electron systems by X-ray diffraction [56,57] can be used to support the association of the spin signal to polaronic distortions. The new mesoscopic phase separation with scale free spatial correlation for spin stripes order found here in nickelates is in agreement with previous indications [53][54][55][56][57][58][59] and it provides the experimental smoking gun evidence that the spin ordering in spin stripes phase in nickelates is near a quantum critical point.…”

Section: Discussionmentioning

confidence: 99%

“…The detection of the complex magnetic structures in strongly correlated electron systems by X-ray diffraction [56,57] can be used to support the association of the spin signal to polaronic distortions. The new mesoscopic phase separation with scale free spatial correlation for spin stripes order found here in nickelates is in agreement with previous indications [53][54][55][56][57][58][59] and it provides the experimental smoking gun evidence that the spin ordering in spin stripes phase in nickelates is near a quantum critical point. A similar spatial fractal landscape has been found in cuprates [46][47][48][49][50][51][52] and in other oxides near a quantum phase transition as in VO 2 [60][61][62][63], in ruthenates [64,65], and in diborides [66,67].…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2019

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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. La 1.72 Sr 0.28 NiO 4 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 La 1.72 Sr 0.28 NiO 4 , 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.Condens. Matter 2019, 4, 77 2 of 10 the stripes phases have been the object of interest for decades [1][2][3], while in this last decade new scanning X-ray diffraction methods have been developed due to the ability to focus X-ray synchrotron radiation to micron and sub-micron spots. These methods have made it possible to obtain visualization of spatial topological inhomogeneity of charge density wave order in doped cuprate perovskites [4,5]. Short range generalized Wigner charge density waves have been found to be spatially inhomogeneous with the formation of "striped charge puddles" anti-correlated with competing puddles of "striped dopants rich clusters" [4][5][6]. These experimental results have opened a new era in the long-standing research of complexity in doped strongly correlated perovskites, since they have falsified popular stripes theories which for decades have assumed a homogeneous spatial distribution of spin stripes and charge-stripes. In this work we focus on the spin stripes phase in doped nickelate perovskites. In order to determine the role that the spatial distribution of ordered phases in cuprates plays for the superconductivity, it is instructive to study a non-superconducting reference system like the layered nickelates [7]. Keeping this idea in mind, we push forward the investigation of the spatial distribution of spin-density-wave stripes ordering (SDW-stripes) in La 2-x Sr x NiO 4 nickelates.It is well known that spin stripes appear in layered nickelates [7] in the doping interval 0.15 ≤ x ≤ 0.5 [7]. In the doping range 0.25 < x < 0.3 magnetic stripes and charge stripes can be easily investigated separately. In La 2-x Sr x NiO 4 the spin-order scattering exhibits peaks in the k-space for (1−ε; 0; l) with odd and even l, whereas charge-order scattering always peaks at (2ε; 0; l) with odd l, [7,8] where t...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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

et al. 2019

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“…Resonant soft X-ray diffraction (RSXD) is another powerful tool to study multiferroics, although, in the case of transition metal oxides, its applicability is limited to materials where magnetic Bragg peaks are present in the Ewald sphere accessible at the L 2,3 , M 4,5 or O K-edge resonances [43]. Nevertheless, significant insights have been obtained using RSXD [44][45][46], and RSXD is also an area of active interest for Diamond theorists [47][48][49][50].…”

Section: (C) Type II Multiferroicsmentioning

confidence: 99%

The contribution of Diamond Light Source to the study of strongly correlated electron systems and complex magnetic structures

Radaelli

Dhesi

2015

Phil. Trans. R. Soc. A.

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We review some of the significant contributions to the field of strongly correlated materials and complex magnets, arising from experiments performed at the Diamond Light Source (Harwell Science and Innovation Campus, Didcot, UK) during the first few years of operation (2007–2014). We provide a comprehensive overview of Diamond research on topological insulators, multiferroics, complex oxides and magnetic nanostructures. Several experiments on ultrafast dynamics, magnetic imaging, photoemission electron microscopy, soft X-ray holography and resonant magnetic hard and soft X-ray scattering are described.

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“…Resonant X-ray scattering (RXS) at the K-edge is a powerful tool for observing the spatial ordering of charge and orbital degrees of freedom in 3d transition metal oxides. [1] The RXS signal at the K-edge (1s → 4p transition energy) reflects the 4p electronic state. On the other hand, the RXS signal at the L 2,3 -edge (2p → 3d transition energy), which is in soft X-ray region, can probe the 3d electronic state directly, and the signal of resonant magnetic scattering is strongly observed at the L 2,3 -edge.…”

Section: Introductionmentioning

confidence: 99%

Electronic Ordering States in Strongly Correlated Electron System Studied by Resonant X-ray Scattering

Nakao

Yamasaki

2019

Proceedings of the 3rd International Symposium of Quantum Beam Science at Ibaraki University "Quantum Beam Science in Biology A

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Advances in the understanding of multiferroics through soft X-ray diffraction

Cited by 6 publications

References 33 publications

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

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

The contribution of Diamond Light Source to the study of strongly correlated electron systems and complex magnetic structures

Electronic Ordering States in Strongly Correlated Electron System Studied by Resonant X-ray Scattering

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