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Ma ZR, Huang XC, Li TJ, Wang HC, Liu GC, Wang ZS, Li B, Li WB, Zhu LF. First Observation of New Flat Line Fano Profile via an X-Ray Planar Cavity. PHYSICAL REVIEW LETTERS 2022; 129:213602. [PMID: 36461956 DOI: 10.1103/physrevlett.129.213602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/10/2021] [Accepted: 09/27/2022] [Indexed: 06/17/2023]
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.
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Affiliation(s)
- Zi-Ru Ma
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Xin-Chao Huang
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Tian-Jun Li
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Hong-Chang Wang
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - Gen-Chang Liu
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering (IPOE), School of Physics science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Zhan-Shan Wang
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering (IPOE), School of Physics science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Bo Li
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Wen-Bin Li
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering (IPOE), School of Physics science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Lin-Fan Zhu
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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Unraveling 5f-6d hybridization in uranium compounds via spin-resolved L-edge spectroscopy. Nat Commun 2017; 8:1203. [PMID: 29084943 PMCID: PMC5662594 DOI: 10.1038/s41467-017-01524-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 09/25/2017] [Indexed: 11/08/2022] Open
Abstract
The multifaceted character of 5f electrons in actinide materials, from localized to itinerant and in between, together with their complex interactions with 6d and other conduction electron states, has thwarted efforts for fully understanding this class of compounds. While theoretical efforts abound, direct experimental probes of relevant electronic states and their hybridization are limited. Here we exploit the presence of sizable quadrupolar and dipolar contributions in the uranium L3-edge X-ray absorption cross section to provide unique information on the extent of spin-polarized hybridization between 5f and 6d electronic states by means of X-ray magnetic circular dichroism. As a result, we show how this 5f-6d hybridization regulates the magnetism of each sublattice in UCu2Si2 and UMn2Si2 compounds, demonstrating the potentiality of this methodology to investigate a plethora of magnetic actinide compounds.
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Yang M, Yang Y, Lei M, Ye C, Zhao C, Xu J, Wu K, Yu M. Experimental studies on soft contact lenses for controlled ocular delivery of pirfinedone: in vitro and in vivo. Drug Deliv 2016; 23:3538-3543. [DOI: 10.1080/10717544.2016.1204570] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Mei Yang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China, and
| | - Yangfan Yang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China, and
| | - Ming Lei
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - Chengtian Ye
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China, and
| | - Chunshun Zhao
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
| | - Jiangang Xu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China, and
| | - Kaili Wu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China, and
| | - Minbin Yu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China, and
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Resonant X-ray emission with a standing wave excitation. Sci Rep 2016; 6:22648. [PMID: 26935531 PMCID: PMC4776127 DOI: 10.1038/srep22648] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 02/17/2016] [Indexed: 11/09/2022] Open
Abstract
The Borrmann effect is the anomalous transmission of x-rays in perfect crystals under diffraction conditions. It arises from the interference of the incident and diffracted waves, which creates a standing wave with nodes at strongly absorbing atoms. Dipolar absorption of x-rays is thus diminished, which makes the crystal nearly transparent for certain x-ray wave vectors. Indeed, a relative enhancement of electric quadrupole absorption via the Borrmann effect has been demonstrated recently. Here we show that the Borrmann effect has a significantly larger impact on resonant x-ray emission than is observable in x-ray absorption. Emission from a dipole forbidden intermediate state may even dominate the corresponding x-ray spectra. Our work extends the domain of x-ray standing wave methods to resonant x-ray emission spectroscopy and provides means for novel spectroscopic experiments in d- and f-electron systems.
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van der Laan G, Figueroa AI. X-ray magnetic circular dichroism—A versatile tool to study magnetism. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.03.018] [Citation(s) in RCA: 153] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Boada R, Laguna-Marco MA, Piquer C, Chaboy J. Competing effects in the magnetic polarization of non-magnetic atoms. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:035604. [PMID: 23238162 DOI: 10.1088/0953-8984/25/3/035604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The magnetic polarization of the Lu 5d states through the Ho(1-x)Lu(x)(Fe(1-y)Al(y))(2) series has been studied by means of x-ray magnetic circular dichroism. A combined study of the dichroic signals performed at the Fe K-, Ho L(2)- and Lu L(2,3)-edges gives a complete picture of the polarization scheme at the conduction band. The results show that in the presence of competing localized magnetic moments, μ(Fe)(3d) and μ(Ho)(4f), the dichroic signal at the Lu site is mainly due to the Fe atoms, the effect of the magnetic rare-earth being negligible. Estimation of the spin and orbital components of the Lu(5d) induced magnetic moment have been obtained by applying the magneto-optical sum rules derived for x-ray magnetic circular dichroism.
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Affiliation(s)
- R Boada
- Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain.
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Souza-Neto NM, Haskel D, Tseng YC, Lapertot G. Pressure-induced electronic mixing and enhancement of ferromagnetic ordering in EuX (X=Te, Se, S, O) magnetic semiconductors. PHYSICAL REVIEW LETTERS 2009; 102:057206. [PMID: 19257546 DOI: 10.1103/physrevlett.102.057206] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2008] [Indexed: 05/27/2023]
Abstract
The pressure- and anion-dependent electronic structure of EuX (X=Te, Se, S, O) monochalcogenides is probed with element- and orbital-specific x-ray absorption spectroscopy in a diamond anvil cell. An isotropic lattice contraction enhances the ferromagnetic ordering temperature by inducing mixing of Eu 4f and 5d electronic orbitals. Anion substitution (Te-->O) enhances competing exchange pathways through spin-polarized anion p states, counteracting the effect of the concomitant lattice contraction. The results have strong implications for efforts aimed at enhancing FM exchange interactions in thin films through interfacial strain or chemical substitutions.
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Affiliation(s)
- Narcizo M Souza-Neto
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
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Brown SD, Strange P, Bouchenoire L, Zarychta B, Thompson PBJ, Mannix D, Stockton SJ, Horne M, Arola E, Ebert H, Szotek Z, Temmerman WM, Fort D. Dipolar excitations at the LIII x-ray absorption edges of the heavy rare-earth metals. PHYSICAL REVIEW LETTERS 2007; 99:247401. [PMID: 18233487 DOI: 10.1103/physrevlett.99.247401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2006] [Indexed: 05/25/2023]
Abstract
We report measured dipolar asymmetry ratios at the LIII edges of the heavy rare-earth metals. The results are compared with a first-principles calculation and excellent agreement is found. A simple model of the scattering is developed, enabling us to reinterpret the resonant x-ray scattering in these materials and to identify the peaks in the asymmetry ratios with features in the spin and orbital moment densities.
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Affiliation(s)
- S D Brown
- XMaS, European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble Cedex, France
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Marcelli A, Cibin G, Cinque G, Mottana A, Brigatti MF. Polarized XANES spectroscopy: The K edge of layered K-rich silicates. Radiat Phys Chem Oxf Engl 1993 2006. [DOI: 10.1016/j.radphyschem.2005.12.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Goulon J, Goulon-Ginet C, Rogalev A, Gotte V, Malgrange C, Brouder C, Natoli CR. X-ray natural circular dichroism in a uniaxial gyrotropic single crystal of LiIO3. J Chem Phys 1998. [DOI: 10.1063/1.476046] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Loeffen PW, Pettifer RF, Müllender S, Röhler J, Sivia DS. Deconvolution of lifetime broadening at rare-earth LIII edges compared to resonant inelastic x-ray scattering measurements. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:14877-14880. [PMID: 9985525 DOI: 10.1103/physrevb.54.14877] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Carra P, Thole BT. X-ray resonant Raman scattering in the rare earths. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:16010-16023. [PMID: 9985672 DOI: 10.1103/physrevb.54.16010] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Giorgetti C, Dartyge E, Brouder C, Baudelet F, Meyer C, Pizzini S, Fontaine A, Galéra RM. Quadrupolar effect in X-ray magnetic circular dichroism. PHYSICAL REVIEW LETTERS 1995; 75:3186-3189. [PMID: 10059516 DOI: 10.1103/physrevlett.75.3186] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Krisch MH, Sette F, Kao CC, Caliebe WA, Hastings JB, Hämäläinen K. Evidence for a quadrupolar excitation channel at the LIII edge of gadolinium by resonant inelastic x-ray scattering. PHYSICAL REVIEW LETTERS 1995; 74:4931-4934. [PMID: 10058635 DOI: 10.1103/physrevlett.74.4931] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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