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

Radaelli, P. G.; Dhesi, S. S.

doi:10.1098/rsta.2013.0148

Cited by 5 publications

(6 citation statements)

References 118 publications

(147 reference statements)

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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%

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%

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

et al. 2019

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“…The I16 materials and magnetism beamline was one of the beamlines able to claim 'first users' at Diamond in 2007, and since that time it has gone on to establish itself as a world-leading beamline for studies of electronic ordering in strongly correlated complex materials via high-resolution resonant diffraction. Radaelli & Dhesi [5] and also McMorrow [6] provide more details of how I16 has contributed to this field in their contributions. The use of SR for chemical crystallography was one of the outstanding successes of the SRS in its later years of operation-one of those 'why didn't we build this earlier' beamlines.…”

Section: (B) Materials Villagementioning

confidence: 99%

“…This beamline offers a 14 T magnet, one of the highest fields currently available, and in addition has a soft X-ray diffractometer built in collaboration with STFC and the University of Durham. The contributions from Radaelli & Dhesi [5] and from McMorrow [6] provide a more detailed perspective on the achievements and opportunities in this field. One of the most surprising features of hard synchrotron X-rays is that they make a superb tool for the study of interfaces via diffraction, and I07 was therefore built to exploit this, building upon pioneering studies at SRS.…”

Section: (E) Spectroscopy Villagementioning

confidence: 99%

Diamond Light Source: status and perspectives

Materlik

Rayment

Stuart

2015

Phil. Trans. R. Soc. A.

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Diamond Light Source, a third-generation synchrotron radiation (SR) facility in the UK, celebrated its 10th anniversary in 2012. A private limited company was set up in April 2002 to plan, construct and operate the new user-oriented SR facility, called in brief Diamond. It succeeded the Synchrotron Radiation Source in Daresbury, a second-generation synchrotron that opened in 1980 as the world's first dedicated X-ray-providing facility, closing finally in 2008, by which time Diamond's accelerators and first beamlines were operating and user experiments were under way. This theme issue of Philosophical Transactions of the Royal Society A gives some examples of the rich diversity of research done in the initial five years, with some glimpses of activity up to 2014. Speakers at the 10 year anniversary symposium were drawn from a small number of major thematic areas and each theme was elaborated by a few speakers whose contributions were placed into a broader context by a leading member of the UK academic community in the role of rapporteur. This introduction gives a summary of the design choices and strategic planning of Diamond as a coherent user facility, a snapshot of its present status and some consideration of future perspectives.

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“…The opportunities for synchrotron sources come not only from the essential role that they play in laying the groundwork for XFEL experiments (with examples given by Radaelli & Dhesi [2] in their review), but also from the challenge they are set to drive forward their technical innovation and capabilities: in a world where XFELs are a reality, synchrotrons cannot stand idly by. The emergence of low-emittance magnetic lattice designs for synchrotrons, with up to a factor of a thousand increase in source brilliance, presents a clear route forward through the construction of new sources such as MAX-IV in Sweden, and for the upgrade of existing ones.…”

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confidence: 99%

“…(At the time of the symposium to mark the 10th anniversary of the inauguration of Diamond, the first phase III beamlines had not yet entered routine user operation.) The article by Radaelli & Dhesi [2] concerns itself with strongly correlated electron systems and materials displaying complex magnetic structures, both areas of considerable contemporary interest to condensed matter physicists, and others seeking materials with new electronic functionality. The contribution by Allan et al [3] complements this viewpoint by focusing on structural aspects of metal-organic framework materials and their chemistry for applications in the energy sector.…”

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confidence: 99%

Physical sciences at Diamond: past achievements and future opportunities

McMorrow

2015

Phil. Trans. R. Soc. A.

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The start of user operation at the Diamond Light Source in January 2007 marks a major milestone for the physical sciences in the UK. The routine delivery to the UK community of ultra-bright X-ray beams from the third-generation source has provided us with capabilities that were available previously only at international sources, and indeed has created some that are unique. Here, a personal view is given of some of the achievements to date, and possible future opportunities outlined.

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

Cited by 5 publications

References 118 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

Diamond Light Source: status and perspectives

Physical sciences at Diamond: past achievements and future opportunities

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