The University of Osaka

Dual Role of Mobile Interstitials in Defect Kinetics: From Retardation to Acceleration

Shihao Zhang, Shihao Zhu, Junping Du +3

Mobile interstitial atoms redistribute while defects migrate, complicating prediction of defect kinetics and leading to contradictory reports of acceleration and retardation. We fo…

Substrate-dependent electrical transport in individual single-walled carbon nanotubes grown across SiO $_{2}$ and hexagonal boron nitride

Yuanjia Liu, Taiki Inoue, Yoshihiro Kobayashi

The electronic transport properties of carbon nanotubes (CNTs) are strongly affected by their surrounding environment, making the underlying substrate a critical factor for device…

Atomically Thin Amorphous Carbon with an Ultralow Dielectric Constant

Chee-Tat Toh, Artem K. Grebenko, Ugur Karadeniz +17

Two-dimensional (2D) materials exhibit excellent properties at monolayer thickness and are viable replacements for various microelectronic components as scaling gradually approache…

Shift current conductivity in monolayer SnS: a tight-binding analysis

Yuki Kusunoki, Tomoaki Kameda, Katsunori Wakabayashi

We investigate the bulk photovoltaic effect in monolayer SnS using an effective tight-binding model derived from first-principles calculations. By comparing short-range and long-ra…

Type-II-like ultrafast demagnetization behavior in NiCo2O4 thin films

Ryunosuke Takahashi, Kaede Yamada, Harjinder Singh +10

Rare-earth-ferrimagnetic oxides are emerging as attractive platforms for investigating ultrafast spin dynamics. Here, we study the photoinduced magnetization dynamics of epitaxial…

Microscopic Origin of Piezomagnetism in Mn $_{3}$ Sn: A Dual Real- and $k$ -Space Picture

Soichiro Kikuchi, Yuki Yanagi, Thi Ngoc Huyen Vu +1

We present a comprehensive first-principles study on the origin of the piezomagnetic effect in the non-collinear antiferromagnet Mn $_{3}$ Sn, a material known for exhibiting a large a…

Recent Progress in Ultrafast Dynamics of Transition-Metal Compounds Studied by Time-Resolved X-ray Techniques

Hiroki Wadati, Kohei Yamamoto, Kohei Yamagami

X-ray absorption spectroscopy and X-ray magnetic circular dichroism have long served as indispensable tools for probing the electronic and magnetic properties of transition-metal c…

X-ray detected ferromagnetic resonance spectrometer with an out-of-vacuum photodetector

Tetsuro Ueno, Yasuo Takeichi, Masaki Mizuguchi +10

X-ray detected ferromagnetic resonance (XFMR) spectroscopy is an experimental technique for element-specific spin dynamics in the GHz regime and has been utilized to study spintron…

Site-selective enhancement of Eu emission in delta-doped GaN

Amelia R. Klein, Hayley J. Austin, Fumikazu Murakami +7

Europium-doped gallium nitride (GaN:Eu) is a promising platform for classical and quantum optoelectronic applications. When grown using organometallic vapor-phase epitaxy, the domi…

Impact of Lattice Distortions on Magnetocrystalline Anisotropy and Magnetization in (Nd $_{1 - x}$ Pr $_{x}$ ) $_{2}$ Fe $_{14}$ B Alloys

Haruki Okumura, Takashi Miyake, Taro Fukazawa +6

Nd $_{2}$ Fe $_{14}$ B -- a widely used permanent magnet -- has magnetocrystalline anisotropy constants that differ between the bulk and interface regions. This study explores the effe…

Dual Role of Nb in Defect-Mediated Strength and Ductility of γ-TiAl Alloys

Zhiqiang Zhao, Siyao Shuang, Kepeng Ouyang +8

The origin of the superior high-temperature strength of γ-TiAl with high Nb addition remains highly controversial, largely due to the unclear role of Nb atoms. Using large-scale hy…

Field-tuning of ultrafast magnetization fluctuations in Sm $_{0.7}$ Er $_{0.3}$ FeO $_{3}$

Marvin Alexander Weiss, Julius Schlegel, Daniel Anić +7

The properties of spin fluctuations in antiferromagnets are largely unexplored, in particular at ultrafast timescales. Here, we employ femtosecond noise correlation spectroscopy (F…

cond-mat.mtrl-sci2025★ 2 cited

Crossover between kite growth and vibrational bridging in pillar-assisted controlled formation of carbon nanotube networks

Yuanjia Liu, Taiki Inoue, Yoshihiro Kobayashi

Pillar-assisted growth is a technique in which short carbon nanotubes (CNTs) form suspended networks by growing across closely spaced microfabricated pillars. During growth, the CN…

Enhanced thermopower in a magnetic semiconductor EuTe4 with multiple charge-density-wave instabilities/

Hidefumi Takahashi, Kiichiro Yoshida, Akitoshi Nakano +1

We investigate the layered magnetic semiconductor EuTe4, focusing on its intricate charge-density wave (CDW) states near and above room temperature through single-crystal X-ray dif…

cond-mat.mtrl-sci2025★ 3 cited

A rutile-based homologous series Na(PtO $_{2}$ ) $_{2 n + 1}$ discovered by computationally assisted high-pressure synthesis

Yasuhito Kobayashi, Hidefumi Takahashi, Shunsuke Kitou +4

Layered transition metal oxides typified by the Ruddlesden-Popper phase have been extensively studied for its applications in high-temperature superconductivity, catalysis, and bat…

cond-mat.mtrl-sci2025★ 2 cited

Phase transitions of eutectic high entropy alloy AlCoCrFeNi2.1 under shock compression

Sophie E. Parsons, Kento Katagiri, Hangman Chen +31

High entropy alloys (HEAs) are a new class of metals that exhibit unique mechanical performance. Among HEAs, additively manufactured eutectic high entropy alloys (AM-EHEAs) have re…

cond-mat.mtrl-sci2025★ 3 cited

Near-surface Defects Break Symmetry in Water Adsorption on CeO $_{2 - x}$ (111)

Oscar Custance, Manuel González Lastre, Kyungmin Kim +7

Water interactions with oxygen-deficient cerium dioxide (CeO $_{2}$ ) surfaces are central to hydrogen production and catalytic redox reactions, but the atomic-scale details of how def…

Effect of crystallinity on spin-orbit torque in 5 $d$ iridium oxide IrO $_{2}$

Tetsuro Morimoto, Kohei Ueda, Junichi Shiogai +3

The 5 $d$ transition-metal oxides provide an intriguing platform for generating an efficient spin current due to a unique electronic structure dominated by 5d electrons wit…

cond-mat.mtrl-sci2025★ 6 cited

Anisotropic Piezomagnetism in Noncollinear Antiferromagnets

Vu Thi Ngoc Huyen, Yuki Yanagi, Michi-To Suzuki

In 3d-electron magnetic systems, the magnetic structures that transform each other by spin rotation have very close degenerate energies due to small spin-orbit coupling and can be…

Resistivity measurement for non-magnetic materials using high-order resonance mode of mfm-cantilever oscillation

Kazuma Okamoto, Takumi Imura, Satoshi Abo +3

A method to measure the electrical resistivity of materials using magnetic-force microscopy (MFM) is discussed, where MFM detects the magnetic field caused by the tip-oscillation-i…

cond-mat.mtrl-sci2025★ 16 cited

Synthesis, crystal and electronic structures, and second harmonic generation of La 4Ge 3S12

Hiroya Ohtsuki, Suguru Nakata, Yu Yamane +3

The crystal structure of La 4 Ge 3S 12 has been known to be noncentrosymmetric for almost four decades. This characteristic inversion symmetry breaking suggests the presence of non…

Room-temperature dislocation plasticity in ceramics: Methods, Materials, and Mechanisms

Alexander Frisch, Chukwudalu Okafor, Oliver Preuß +5

Dislocation-mediated plastic deformation in ceramic materials has sparked renewed research interest due to the technological potential of dislocations. Despite the long research hi…

cond-mat.mtrl-sci2025★ 2 cited

Efficient defect healing of single-walled cabron nanotubes through $C_{2} H_{2}$ -assisted multiple-cycle treatment with air exposure

Man Shen, Taiki Inoue, Mengyue Wang +2

Defects in single-walled carbon nanotubes (SWCNTs) degrade their mechanical,electrical, and thermal properties, limiting their potential applications. To realize the diverse applic…