Anisotropic resonant X-ray scattering: Beauty of forbidden reflections

Kokubun, Jun; Дмитриенко, В. Е.

doi:10.1140/epjst/e2012-01605-4

Cited by 17 publications

(10 citation statements)

References 53 publications

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“…Previously, ATS scattering has mainly been observed at transition metal K edges [41,42]. However, disentangling the physics from such K-edge measurements is difficult, as the K edge corresponds to 1s to np dipole transitions, where n is the first partially filled p shell, and higher-order transitions, (for example, the quadrupole transition is 1s to nd) can contribute.…”

Section: Energy Dependence Of Scattering From Un and U 2 N 3 Filmsmentioning

confidence: 99%

Synchrotron x-ray scattering of magnetic and electronic structure of UN and U2N3 epitaxial films

et al. 2019

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We examine the magnetic ordering of UN and of a closely related nitride, U 2 N 3 , by preparing thin epitaxial films and using synchrotron x-ray techniques. The magnetic configuration and subsequent coupling to the lattice are key features of the electronic structure. The well-known antiferromagnetic (AF) ordering of UN is confirmed, but the expected accompanying distortion at T N is not observed. Instead, we propose that the strong magnetoelastic interaction below T N causes substantial changes in the strain in the sample being measured. These strains vary as a function of the sample form. As a consequence, the accepted AF configuration of UN may be incorrect. In the case of cubic α-U 2 N 3 , no single crystals have been previously prepared, and we have determined the AF ordering wave vector. The AF T N is close to that previously reported. In addition, resonant diffraction methods have identified an aspherical quadrupolar charge contribution in U 2 N 3 involving the 5 f electrons.

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Section: Energy Dependence Of Scattering From Un and U 2 N 3 Filmsmentioning

confidence: 99%

Synchrotron x-ray scattering of magnetic and electronic structure of UN and U2N3 epitaxial films

et al. 2019

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“…A review about recent developments applying AAS and forbidden reflections can be found in Kokobun et al . . In 2012, further reviews appeared on the occasion of the Resonant Elastic X‐ray Scattering workshop 2011 concerning the development within the last 20 years in general and with specific focus on actinide systems , theoretical aspects as well as polarization analysis .…”

Section: History and Present Statusmentioning

confidence: 99%

Probing a crystal's short‐range structure and local orbitals by Resonant X‐ray Diffraction methods

Zschornak

Richter

Nentwich

et al. 2014

Crystal Research and Technology

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Diffraction Anomalous Fine Structure (DAFS) combines the long‐range, crystallographic sensitivity of X‐ray diffraction with the short‐range sensitivity of X‐ray Absorption Spectroscopy (XAS). In comparison to other spectroscopic methods, DAFS can additionally distinguish phases of different translational symmetry by choice of momentum transfer, or isolate spectra from chemically identical atoms on various Wyckoff sites of a crystal's structure using crystallographic weights. The Anisotropy of Anomalous Scattering (AAS) extends the concept of isotropically scattering atoms to a more general case, where the atom's scattering characteristics depend on the polarization as well as the wavevector of the incident and scattered X‐rays. These can be written as tensors that reflect the local site symmetries of the resonant atom. Forbidden Reflection Near‐Edge Diffraction (FRED) is an elegant way to measure AAS by using reflections that are extinguished in the special case of isotropically scattering atoms. They can only be observed due to the non‐isotropic contributions at photon energies in the vicinity of an absorption edge where electronic transitions occur. Combining the site selectivity of DAFS with the information accessible through AAS allows probing the short‐range order and local orbitals of selected atoms in a crystal structure of a chosen phase. The present condensed review gives a brief overview on the pioneer work, the theory and sensitivities as well as selected recent applications of these powerful and promising Resonant X‐ray Diffraction (RXD) methods. Additionally, some recent work of the authors is included exemplarily for the model structure rutile TiO2 presenting the progress in measurement and interpretation.

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“…For other examples and reviews on K -edge resonant diffraction experiments, see Refs. [12][13][14]. The study by Staub et al [11] was performed on NNO films grown using PLD on substrates of (001)-oriented NdGaO 3 substrates, which are also Pbnm.…”

Section: The Mit: Charge Disproportionationmentioning

confidence: 99%

“…14 RSMs around a (015) and b (005) for an LNO film compared to c (015) and d (005) for an LAO film, both with 100 nm thickness…”

mentioning

confidence: 99%

The Nickelates: A Spin Density Wave

Frañó

2014

Spin Spirals and Charge Textures in Transition-Metal-Oxide Heterostructures

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Engineering new electronic and structural phases by combining complex materials into heterostructures is a task taken on with widespread enthusiasm around the world. Amongst others, heterostructures comprising 113-rare-earth nickelates RNiO 3 (RNO), where R is any rare earth metal in the Lanthanum line, have become very popular. In the bulk, the RNO family of materials display a phase diagram which reflects the complexity of TMOs. It has several electronic phases which are accessible by small structural changes. In this chapter, we will review some of the most relevant aspects of the RNO family, spanning research done over more than a decade. In the end of this summary, we will outline theories of how the ground state of these materials can be described, motivating the study of this Ph.D. In the experimental part, we will present evidence of a novel kind of magnetic order in LaNiO 3 (LNO)based superlattices (SLs), as well as in RNO films grown under epitaxial strain, using RSXS. We will attempt in the discussion to connect these findings to a spin density wave (SDW) instability in the FS of these materials. Properties of Bulk RNOTo summarize the properties of 113 rare-earth nickelate family, the following section was collected from body of literature developed between 1992 to the present, including most prominently Refs. [1-5]. Electronic Configuration and the Torrance Phase DiagramWe begin the discussion of the properties of bulk RNO with a brief description of the its electronic configuration shown in Fig. 3.1(left). Formally, the Ni 3+ ion inside a perovskite building block is in a 3d 7 valence electron configuration. The lowerlying t 2g -levels are all full with six antiparallel electrons. This leaves one electron A.

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Anisotropic resonant X-ray scattering: Beauty of forbidden reflections

Cited by 17 publications

References 53 publications

Synchrotron x-ray scattering of magnetic and electronic structure of UN and U2N3 epitaxial films

Synchrotron x-ray scattering of magnetic and electronic structure of UN and U2N3 epitaxial films

Probing a crystal's short‐range structure and local orbitals by Resonant X‐ray Diffraction methods

The Nickelates: A Spin Density Wave

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