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131 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2, 3, 4, 5, 6, 7, 8 [Next/Last]

Instruments / Technical Area	Publication Details	Published
I15-1-X-ray Pair Distribution Function (XPDF) I15-Extreme Conditions	Multiple local symmetries result in a common average polar axis in high-strain BiFeO3-based ceramics Ge Wang , Tengfei Hu , Wenxuan Zhu , Zhilun Lu , Annette Kleppe , Maria Diaz Lopez , Antonio Feteira , Derek C. Sinclair , Zhengqian Fu , Houbing Huang , Dawei Wang , Ian M. Reaney Physical Review Letters 130 DOI: 10.1103/PhysRevLett.130.076801 Diamond Proposal Number(s): [21714, 27500] Show Abstract ▼ Abstract: For the first time, the origin of large electrostrain in pseudocubic BiFeO 3 -based ceramics is verified with direct structural evidence backed by appropriate simulations. We employ advanced structural and microstructural characterizations of BiFeO 3 -based ceramics that exhibit large electrostrain ( > 0.4 % ) to reveal the existence of multiple, nanoscale local symmetries, dominantly tetragonal or orthorhombic, which have a common, averaged direction of polarization over larger, meso- or microscale regions. Phase-field simulations confirm the existence of local nanoscale symmetries, thereby providing a new vision for designing high-performance lead-free ceramics for high-strain actuators.	Feb 2023
I05-ARPES	Hierarchy of Lifshitz transitions in the surface electronic structure of Sr2RuO4 under uniaxial compression Edgar Abarca Morales , Gesa-R. Siemann , Andela Zivanovic , Philip A. E. Murgatroyd , Igor Markovic , Brendan Edwards , Chris A. Hooley , Dmitry A. Sokolov , Naoki Kikugawa , Cephise Cacho , Matthew D. Watson , Timur K. Kim , Clifford W. Hicks , Andrew P. Mackenzie , Phil D. C. King Physical Review Letters 130 DOI: 10.1103/PhysRevLett.130.096401 Diamond Proposal Number(s): [27471, 28412] Show Abstract ▼ Abstract: We report the evolution of the electronic structure at the surface of the layered perovskite Sr 2 RuO 4 under large in-plane uniaxial compression, leading to anisotropic B 1 g strains of ϵ x x − ϵ y y = − 0.9 ± 0.1 % . From angle-resolved photoemission, we show how this drives a sequence of Lifshitz transitions, reshaping the low-energy electronic structure and the rich spectrum of van Hove singularities that the surface layer of Sr 2 RuO 4 hosts. From comparison to tight-binding modeling, we find that the strain is accommodated predominantly by bond-length changes rather than modifications of octahedral tilt and rotation angles. Our study sheds new light on the nature of structural distortions at oxide surfaces, and how targeted control of these can be used to tune density of state singularities to the Fermi level, in turn paving the way to the possible realization of rich collective states at the Sr 2 RuO 4 surface.	Feb 2023
I10-Beamline for Advanced Dichroism	Structural chirality of polar skyrmions probed by resonant elastic X-ray scattering Margaret R. Mccarter , Kook Tae Kim , Vladimir A. Stoica , Sujit Das , Christoph Klewe , Elizabeth P. Donoway , David M. Burn , Padraic Shafer , Fanny Rodolakis , Mauro A. p. Gonçalves , Fernando Gómez-Ortiz , Jorge Íñiguez , Pablo García-Fernández , Javier Junquera , Stephen W. Lovesey , Gerrit Van Der Laan , Se Young Park , John W. Freeland , Lane W. Martin , Dong Ryeol Lee , Ramamoorthy Ramesh Physical Review Letters 129 DOI: 10.1103/PhysRevLett.129.247601 Diamond Proposal Number(s): [24797] Show Abstract ▼ Abstract: An escalating challenge in condensed-matter research is the characterization of emergent order-parameter nanostructures such as ferroelectric and ferromagnetic skyrmions. Their small length scales coupled with complex, three-dimensional polarization or spin structures makes them demanding to trace out fully. Resonant elastic x-ray scattering (REXS) has emerged as a technique to study chirality in spin textures such as skyrmions and domain walls. It has, however, been used to a considerably lesser extent to study analogous features in ferroelectrics. Here, we present a framework for modeling REXS from an arbitrary arrangement of charge quadrupole moments, which can be applied to nanostructures in materials such as ferroelectrics. With this, we demonstrate how extended reciprocal space scans using REXS with circularly polarized x rays can probe the three-dimensional structure and chirality of polar skyrmions. Measurements, bolstered by quantitative scattering calculations, show that polar skyrmions of mixed chirality coexist, and that REXS allows valuation of relative fractions of right- and left-handed skyrmions. Our quantitative analysis of the structure and chirality of polar skyrmions highlights the capability of REXS for establishing complex topological structures toward future application exploits.	Dec 2022
B16-Test Beamline	First observation of new flat line Fano profile via an X-ray planar cavity Zi-Ru Ma , Xin-Chao Huang , Tian-Jun Li , Hong-Chang Wang , Gen-Chang Liu , Zhan-Shan Wang , Bo Li , Wen-Bin Li , Lin-Fan Zhu Physical Review Letters 129 DOI: 10.1103/PhysRevLett.129.213602 Diamond Proposal Number(s): [21446] Show Abstract ▼ Abstract: A new Fano profile of a flat line is achieved experimentally by manipulating the relative amplitude of the continuum path, when q takes the pure imaginary number of − i in the x-ray regime. The underlying mechanism is that the interference term in the scattering will cancel the discrete term exactly. This new Fano profile renders only an observable continuum along with an invisible response to the discrete state of atomic resonance. The results suggest not only a different strategy to invisibility studies which provides a possible tool to identify weaker structures hidden by the strong white line, but also a new scenario to enrich the manipulations of two-path interference and nonlinear Fano resonance.	Nov 2022
I21-Resonant Inelastic X-ray Scattering (RIXS)	Gapped collective charge excitations and interlayer hopping in cuprate superconductors M. Hepting , M. Bejas , A. Nag , H. Yamase , N. Coppola , D. Betto , C. Falter , Mirian Garcia-Fernandez , S. Agrestini , K.-J. Zhou , M. Minola , C. Sacco , L. Maritato , P. Orgiani , H. I. Wei , K. M. Shen , D. G. Schlom , A. Galdi , A. Greco , B. Keimer Physical Review Letters 129 DOI: 10.1103/PhysRevLett.129.047001 Diamond Proposal Number(s): [23933] Open Access Show Abstract ▼ Abstract: We use resonant inelastic x-ray scattering to probe the propagation of plasmons in the electron-doped cuprate superconductor Sr 0.9 La 0.1 CuO 2 . We detect a plasmon gap of ∼ 120 meV at the two-dimensional Brillouin zone center, indicating that low-energy plasmons in Sr 0.9 La 0.1 CuO 2 are not strictly acoustic. The plasmon dispersion, including the gap, is accurately captured by layered t − J − V model calculations. A similar analysis performed on recent resonant inelastic x-ray scattering data from other cuprates suggests that the plasmon gap is generic and its size is related to the magnitude of the interlayer hopping t z . Our work signifies the three dimensionality of the charge dynamics in layered cuprates and provides a new method to determine t z .	Jul 2022
I09-Surface and Interface Structural Analysis	Atomic-site-specific surface valence-band structure from X-ray standing-wave excited photoemission Yanna Chen , Leighton O. Jones , Tien-Lin Lee , Anusheela Das , Martín A. Mosquera , Denis T. Keane , George C. Schatz , Michael J. Bedzyk Physical Review Letters 128 DOI: 10.1103/PhysRevLett.128.206801 Diamond Proposal Number(s): [20076] Show Abstract ▼ Abstract: X-ray standing-wave (XSW) excited photoelectron emission was used to measure the site-specific valence band (VB) for ½ monolayer (ML) Pt grown on a SrTiO 3 (001) surface. The XSW induced modulations in the core level (CL), and VB photoemission from the surface and substrate atoms were monitored for three h k l substrate Bragg reflections. The XSW CL analysis shows the Pt to have a face-centered-cubic-like cube-on-cube epitaxy with the substrate. The XSW VB information compares well to a density functional theory calculated projected density of states from the surface and substrate atoms. Overall, this Letter represents a novel method for determining the contribution to the density of states by valence electrons from specific atomic surface sites.	May 2022
	Hidden k-space magnetoelectric multipoles in nonmagnetic ferroelectrics Sayantika Bhowal , Stephen P. Collins , Nicola A. Spaldin Physical Review Letters 128 DOI: 10.1103/PhysRevLett.128.116402 Open Access Show Abstract ▼ Abstract: In condensed matter systems, the electronic degrees of freedom are often entangled to form complex composites, known as hidden orders, which give rise to unusual properties, while escaping detection in conventional experiments. Here we demonstrate the existence of hidden k -space magnetoelectric multipoles in nonmagnetic systems with broken space-inversion symmetry. These k -space magnetoelectric multipoles are reciprocal to the real-space charge dipoles associated with the broken inversion symmetry. Using the prototypical ferroelectric PbTiO 3 as an example, we show that their origin is a spin asymmetry in momentum space resulting from the broken space inversion symmetry associated with the ferroelectric polarization. In PbTiO 3 , the k -space spin asymmetry corresponds to a pure k -space magnetoelectric toroidal moment, which can be detected using magnetic Compton scattering, an established tool for probing magnetism in ferromagnets or ferrimagnets with a net spin polarization, which has not been exploited to date for nonmagnetic systems. In particular, the k -space magnetoelectric toroidal moment combined with the spin-orbit interaction manifest in an antisymmetric magnetic Compton profile that can be reversed using an electric field. Our work suggests an experimental route to directly measuring and tuning hidden k -space magnetoelectric multipoles via specially designed magnetic Compton scattering measurements.	Mar 2022
I05-ARPES	Signatures of weyl fermion annihilation in a correlated kagome magnet Ilya Belopolski , Tyler A. Cochran , Xiaoxiong Liu , Zi-Jia Cheng , Xian P. Yang , Zurab Guguchia , Stepan S. Tsirkin , Jia-Xin Yin , Praveen Vir , Gohil S. Thakur , Songtian S. Zhang , Junyi Zhang , Konstantine Kaznatcheev , Guangming Cheng , Guoqing Chang , Daniel Multer , Nana Shumiya , Maksim Litskevich , Elio Vescovo , Timur K. Kim , Cephise Cacho , Nan Yao , Claudia Felser , Titus Neupert , M. Zahid Hasan Physical Review Letters 127 DOI: 10.1103/PhysRevLett.127.256403 Diamond Proposal Number(s): [17924, 19313] Show Abstract ▼ Abstract: The manipulation of topological states in quantum matter is an essential pursuit of fundamental physics and next-generation quantum technology. Here we report the magnetic manipulation of Weyl fermions in the kagome spin-orbit semimetal Co 3 Sn 2 S 2 , observed by high-resolution photoemission spectroscopy. We demonstrate the exchange collapse of spin-orbit-gapped ferromagnetic Weyl loops into paramagnetic Dirac loops under suppression of the magnetic order. We further observe that topological Fermi arcs disappear in the paramagnetic phase, suggesting the annihilation of exchange-split Weyl points. Our findings indicate that magnetic exchange collapse naturally drives Weyl fermion annihilation, opening new opportunities for engineering topology under correlated order parameters.	Dec 2021
I10-Beamline for Advanced Dichroism	Superposition of emergent monopole and antimonopole in CoTb thin films Yao Guang , Kejing Ran , Junwei Zhang , Yizhou Liu , Senfu Zhang , Xuepeng Qiu , Yong Peng , Xixiang Zhang , Markus Weigand , Joachim Gräfe , Gisela Schütz , Gerrit Van Der Laan , Thorsten Hesjedal , Shilei Zhang , Guoqiang Yu , Xiufeng Han Physical Review Letters 127 DOI: 10.1103/PhysRevLett.127.217201 Diamond Proposal Number(s): [23785] Show Abstract ▼ Abstract: A three-dimensional singular point that consists of two oppositely aligned emergent monopoles is identified in continuous CoTb thin films, as confirmed by complementary techniques of resonant elastic x-ray scattering, Lorentz transmission electron microscopy, and scanning transmission x-ray microscopy. This new type of topological defect can be regarded as a superposition of an emergent magnetic monopole and an antimonopole, around which the source and drain of the magnetic flux overlap in space. We experimentally prove that the observed spin twist seen in Lorentz transmission electron microscopy reveals the cross section of the superimposed three-dimensional structure, providing a straightforward strategy for the observation of magnetic singularities. Such a quasiparticle provides an excellent platform for studying the rich physics of emergent electromagnetism.	Nov 2021
I13-2-Diamond Manchester Imaging	Dynamic multicontrast X-ray imaging method applied to additive manufacturing Lorenzo Massimi , Samuel J. Clark , Sebastian Marussi , Adam Doherty , Joachim Schulz , Shashidhara Marathe , Christoph Rau , Marco Endrizzi , Peter D. Lee , Alessandro Olivo Physical Review Letters 127 DOI: 10.1103/PhysRevLett.127.215503 Diamond Proposal Number(s): [23760] Show Abstract ▼ Abstract: We present a dynamic implementation of the beam-tracking x-ray imaging method providing absorption, phase, and ultrasmall angle scattering signals with microscopic resolution and high frame rate. We demonstrate the method’s ability to capture dynamic processes with 22-ms time resolution by investigating the melting of metals in laser additive manufacturing, which has so far been limited to single-modality synchrotron radiography. The simultaneous availability of three contrast channels enables earlier segmentation of droplets, tracking of powder dynamic, and estimation of unfused powder amounts, demonstrating that the method can provide additional information on melting processes.	Nov 2021

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