Impurity position and lattice distortion in a Mn-doped 
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 topological insulator investigated by x-ray fluorescence holography and x-ray absorption fine structure

Hosokawa, Shinya; Stellhorn, Jens Rüdiger; Matsushita, Teruo; Happo, Naohisa; Kawasaki, Koji; Hayashi, Koichi; Ebisu, Yoshihiro; Ozaki, T.; Ikemoto, Hiroyuki; Setoyama, Hiroyuki; Okajima, Toshihiro; Yoda, Yoshitaka; Ishii, Hirofumi; Liao, Yen-Fa; Kitaura, Mamoru; Sasaki, Minoru

doi:10.1103/physrevb.96.214207

Cited by 54 publications

(24 citation statements)

References 33 publications

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“…SPEA‐L1 is a fitting based algorithm that uses L 1 regularized linear regression that begins with a reconstructed image obtained from Barton's method . The SPEA‐L1 algorithm has been used to obtain good atomic reconstructions from single energy holograms and multiple energy holograms …”

Section: Methodsmentioning

confidence: 99%

“…The λ parameter, which controls the sparseness of the reconstruction, is defined as

λ = β max true[- \partial E true(g true) / \partial g true]

, where E ( g ) is the mean error function, g is the voxel number and β is set at 0.90. Fourfold symmetrization and mirror plane operations on the X‐,Y‐, and Z‐ axis were also applied in the reconstruction.…”

Section: Methodsmentioning

confidence: 99%

“…Since the first successful experimental demonstration by Tegze and Faigel in 1996, it is now being routinely employed to investigate the structure of various materials. Using inverse mode XFH (IXFH), there have been several interesting results recently reported about dopants, thin films, and bulk materials, information that would have been difficult, if not impossible to obtain using other X‐ray based techniques.…”

Section: Introductionmentioning

confidence: 99%

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Direct Imaging of Valence‐Sensitive X‐Ray Fluorescence Holograms of Fe₃O₄

Ang

Matsushita

Hashimoto

et al. 2018

Physica Status Solidi (b)

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X‐ray fluorescence holography (XFH) is typically performed using zero‐dimensional detectors. This makes data acquisition in synchrotron facilities time consuming. Here, we report the first direct imaging of the X‐ray fluorescence hologram of a Fe3O4 sample using a 2D hybrid detector. The apparatus, data acquisition and data processing are described here. The recorded Fe Kα hologram agreed well with simulations, and the atomic images reconstructed using the SPEA‐L1 algorithm showed agreement with the expected Fe and O positions. Furthermore, by tuning the incident X‐ray energy, fluorescence from the Fe3+ cations can be suppressed, allowing the imaging of Fe Kα holograms from Fe2.5+ cations. The valence‐sensitivity of the holograms was confirmed by the appearance of different sets of Kossel lines in the hologram, and in the atomic reconstructions. Reconstructions from the holograms from Fe2.5+ cations show that these emitters are located on octahedral sites, and the reconstruction from the Fe3+ holograms shows emitters on the tetrahedral sites. These results demonstrate that the new 2D hybrid detector‐based apparatus is a good XFH alternative that can be used to clarify structures of multi‐valence materials. Further applications to radiation‐damage sensitive samples, and even time‐resolved XFH experiments can also be achieved using this new XFH apparatus.

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Section: Methodsmentioning

confidence: 99%

“…The λ parameter, which controls the sparseness of the reconstruction, is defined as

λ = β max true[- \partial E true(g true) / \partial g true]

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Direct Imaging of Valence‐Sensitive X‐Ray Fluorescence Holograms of Fe₃O₄

Ang

Matsushita

Hashimoto

et al. 2018

Physica Status Solidi (b)

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“…To date, intense efforts have been made regarding intentional magnetic doping of topological semiconductors. Ferromagnetism of MTIs has been reported in Fe and Mn-doped Bi 2 Te 3 [3][4][5], Co and Fedoped Bi 2 Se 3 [6][7][8], Cr-doped Sb 2 Te 3 [9], and V-doped (Bi,Sb) 2 Te 3 [10]. In particular, the stability, electronic, and magnetic properties of the MTIs Bi 2 Se 3 , Bi 2 Te 3 , and Sb 2 Te 3 have been predicted and provided important guidance for magnetism incorporation in MTIs experimentally [11].…”

Section: Introductionmentioning

confidence: 99%

Crossover from weak-antilocalization transport to quantum magnetoresistance of Dirac states in quenched Fe_0.01Bi₂Te₃ single crystals with large magnetoresistance and high Hall mobility

Wang

Shen

et al. 2020

New J. Phys.

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Magnetotransport properties with a large positive magnetoresistance (MR) and a high carrier mobility for applications have been achieved and probed for quenched Fe 0.01 Bi 2 Te 3 single crystals. Large positive MR of ∼470% with a Hall mobility of ∼44 000 cm 2 V −1 s −1 at 5 K and 6 T has been observed on a quenched Fe 0.01 Bi 2 Te 3 sample, in which the electrical parameters can be tuned by the quenching temperature T q . The MR behaviors for the quenched samples show a crossover from a weak antilocalization-dominant MR to a linear and non-saturating MR at temperatures of T * ≈58−100 K, where the large MR at low temperatures possibly originates from the mechanism of topologically protected backscattering. On the contrary, the MR behaviors for the strain-released sample do not show such a distinct crossover, where only linear-like and non-saturating MR behaviors can be observed. Different electrical transports between the quenched and strain-released samples indicate that the band structure, as well as the surface Dirac electrons in Fe 0.01 Bi 2 Te 3 , can be modified by the lattice strain. Furthermore, it is found that the low-temperature magnetoconductivity can be well described by the weak-antilocalization transport formula, while the high-field linear-like MR at T>T * can be explained in terms of Abrikosov's quantum transport of Dirac-cone states in quenched Fe 0.01 Bi 2 Te 3 single crystals.

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“…X-ray fluorescence holography (XFH) is a powerful tool for investigating the local atomic configuration around a selected element emitting fluorescent X-rays. [11][12][13][14][15][16][17][18][19] In particular, XFH has been performed for investigating local arrangements around dopants in various materials, such as Mn-doped Bi 2 Te 3 topological insulator 15 and Codoped TiO 2 magnetic thin film, 12 which served to obtain an atomiclevel understanding on the role of dopants. In the present study, we apply XFH to a (In 0.18 Bi 0.82 ) 2 Se 3 single crystal.…”

Section: Introductionmentioning

confidence: 99%

Local structural analysis of In‐doped Bi₂Se₃ topological insulator using X‐ray fluorescence holography

Kawasaki

Hayashi

Yashina

et al. 2018

Surface & Interface Analysis

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We performed X‐ray fluorescence holography measurements on an In‐doped Bi2Se3 topological insulator and obtained an in‐plane atomic image in the vicinity of In. We found that atomic images at the positions of the first nearest neighbors (NNs) are very weak whereas those at the positions of the second and the third NNs are relatively strong. On the basis of the fact that In is half of the atomic number of Bi, we attributed the origin of this feature to the clustering of the In atoms in the Bi plane. We calculated the intensity of the atomic images and confirmed that the formation of In cluster results in a decrease by 30% in the first NN atomic image intensity. However, the decrease in the magnitude is not enough to explain the experimental results, suggesting another contribution such as the lattice distortions. The effect of the lattice distortion on the atomic image intensity is discussed on the basis of the simulation including the positional fluctuation of In atoms.

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Impurity position and lattice distortion in a Mn-doped Bi2Te3 topological insulator investigated by x-ray fluorescence holography and x-ray absorption fine structure

Cited by 54 publications

References 33 publications

Direct Imaging of Valence‐Sensitive X‐Ray Fluorescence Holograms of Fe₃O₄

Direct Imaging of Valence‐Sensitive X‐Ray Fluorescence Holograms of Fe₃O₄

Crossover from weak-antilocalization transport to quantum magnetoresistance of Dirac states in quenched Fe_0.01Bi₂Te₃ single crystals with large magnetoresistance and high Hall mobility

Local structural analysis of In‐doped Bi₂Se₃ topological insulator using X‐ray fluorescence holography

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Impurity position and lattice distortion in a Mn-doped Bi2Te3 topological insulator investigated by x-ray fluorescence holography and x-ray absorption fine structure

Cited by 54 publications

References 33 publications

Direct Imaging of Valence‐Sensitive X‐Ray Fluorescence Holograms of Fe3O4

Direct Imaging of Valence‐Sensitive X‐Ray Fluorescence Holograms of Fe3O4

Crossover from weak-antilocalization transport to quantum magnetoresistance of Dirac states in quenched Fe0.01Bi2Te3 single crystals with large magnetoresistance and high Hall mobility

Local structural analysis of In‐doped Bi2Se3 topological insulator using X‐ray fluorescence holography

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Product

Resources

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Direct Imaging of Valence‐Sensitive X‐Ray Fluorescence Holograms of Fe₃O₄

Direct Imaging of Valence‐Sensitive X‐Ray Fluorescence Holograms of Fe₃O₄

Crossover from weak-antilocalization transport to quantum magnetoresistance of Dirac states in quenched Fe_0.01Bi₂Te₃ single crystals with large magnetoresistance and high Hall mobility

Local structural analysis of In‐doped Bi₂Se₃ topological insulator using X‐ray fluorescence holography