192 citations · 1.4k across the 31 of their papers we have counts for
28 papers · 1 filter
Evolution of charge dynamics in FeSeTe: Effects of electronic correlations and nematicity
M. Nakajima, K. Yanase, M. Kawai +6
We systematically studied in-plane optical conductivity of FeSeTe thin films fabricated on CaF substrates for = 0, 0.1, 0.2, and 0.4. This system shows a la…
Control of band structure of FeSe single crystals via biaxial strain
M. Nakajima, Y. Ohata, S. Tajima
We performed systematic transport measurements on FeSe single crystals with applying in-plane biaxial strain ranging from -0.96% to 0.23%. Biaxial strain was introduc…
Comprehensive study of out-of-plane transport properties in BaFeAs: Three-dimensional electronic state and effect of chemical substitution
Masamichi Nakajima, Masahiko Nagafuchi, Setsuko Tajima
We investigated the out-of-plane transport properties of parent and chemically substituted BaFeAs for various types of substitution. Based on the studies of Hall coeffi…
Lattice dynamics in FeSe via inelastic x-ray scattering and first-principles calculations
Naoki Murai, Tatsuo Fukuda, Masamichi Nakajima +4
We report an inelastic x-ray scattering investigation of phonons in FeSe superconductor. Comparing the experimental phonon dispersion with density functional theory (DFT) calculati…
Effect of electron correlations on spin excitation bandwidth in BaKFeAs as seen via time-of-flight inelastic neutron scattering
Naoki Murai, Katsuhiro Suzuki, Shin-ichiro Ideta +4
We use inelastic neutron scattering (INS) to investigate the effect of electron correlations on spin dynamics in the iron-based superconductor BaKFeAs…
Antiphase Fermi-surface modulations accompanying displacement excitation in a parent compound of iron-based superconductors
Kozo Okazaki, Hakuto Suzuki, Takeshi Suzuki +12
We investigate the transient electronic structure of BaFe2As2, a parent compound of iron-based superconductors, by time- and angle-resolved photoemission spectroscopy. In order to…
Diverse fluctuations and anisotropic Gr{\" u}neisen parameter behavior in iron-based superconductor Ba(FeCo)As and their correlation with superconductivity
Chiaki Fujii, Shalamujiang Simayi, Kouhei Sakano +10
In this study, the temperature dependence of elastic constants , , , and of the iron-based superconductor Ba(Fe$_{1…
Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals
Shigeyuki Ishida, Dongjoon Song, Hiraku Ogino +5
In order to establish the doping dependence of the critical current properties in the iron-based superconductors, the in-plane critical current density (Jc) of BaFe2As2-based super…
Investigation of Precursor Superconducting State in YBaCuO through In-plane Optical Spectroscopy
Kegan Lee, Keisuke Kamiya, Masamichi Nakajima +2
A precursor of superconductivity has been searched in the in-plane optical spectra of underdoped YBaCuO, in which the previous -axis optical spectra showed the prese…
Unusual nodal behaviors of the superconducting gap in the iron-based superconductor Ba(FeRu)As: Effects of spin-orbit coupling
L. Liu, K. Okazaki, T. Yoshida +22
We have investigated the superconducting gap of optimally doped Ba(FeRu)As by angle-resolved photoemission spectroscopy (APRES) using bulk-sensitive 7 eV…
Ultrafast Melting of Spin Density Wave Order in BaFeAs Observed by Time- and Angle-Resolved Photoemission Spectroscopy with Extreme-Ultraviolet Higher Harmonic Generation
H. Suzuki, K. Okazaki, T. Yamamoto +13
Transient single-particle spectral function of BaFeAs, a parent compound of iron-based superconductors, has been studied by time- and angle-resolved photoemission spect…
In-plane electronic anisotropy in the antiferromagnetic-orthorhombic phase of isovalent-substituted Ba(FeRu)As
L. Liu, T. Mikami, S. Ishida +17
We have studied the anisotropy in the in-plane resistivity and the electronic structure of isovalent Ru-substituted BaFeAs in the antiferromagnetic-orthorhombic phase using…
Evidence of a universal relation between electron-mode coupling and Tc in Ba1-xKxFe2As2 superconductor from Laser ARPES
W. Malaeb, T. Shimojima, Y. Ishida +15
We performed a Laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba1-xKxFe2As2 (BaK) iron-based superconductor. We observed a robust low-bindi…
Strange Inter-layer Properties of Appearing in Ultrasonic Measurements
S. Simayi, K. Sakano, H. Takezawa +9
We have investigated the elastic constant C33 of Ba(Fe1-xCox)2As2 with eight different Co concentrations by ultrasonic measurement. We found remarkable elastic anomalies near the q…
Universality of dispersive spin-resonance mode in superconducting BaFe2As2
C. H. Lee, P. Steffens, N. Qureshi +5
Spin fluctuations in superconducting BaFe2(As1-xPx)2 (x=0.34, Tc = 29.5 K) are studied using inelastic neutron scattering. Well-defined commensurate magnetic signals are observed a…
Strong electronic correlations in iron pnictides: Comparison of the optical spectra for BaFe2As2-related compounds
M. Nakajima, S. Ishida, T. Tanaka +11
We carried out combined transport and optical measurements for BaFe2As2 and five isostructural transition-metal (TM) pnictides. The low-energy optical conductivity spectra of these…
Effects of Zn substitution on the electronic structure of BaFeAs revealed by angle-resolved photoemission spectroscopy
S. Ideta, T. Yoshida, M. Nakajima +13
In Fe-based superconductors, electron doping is often realized by the substitution of transition-metal atoms for Fe. In order to investigate how the electronic structure of the par…
Effect of doping on the magnetostructural ordered phase of iron arsenides: A comparative study of the resistivity anisotropy in the doped BaFeAs with doping into three different sites
Shigeyuki Ishida, Masamichi Nakajima, Tian Liang +8
In order to unravel a role of doping in the iron-based superconductors, we investigated the in-plane resistivity for BaFeAs doped at either of the three different lattice s…
Pseudogap formation above the superconducting dome in iron-pnictides
T. Shimojima, T. Sonobe, W. Malaeb +29
The nature of the pseudogap in high transition temperature (high-Tc) superconducting cuprates has been a major issue in condensed matter physics. It is still unclear whether the hi…
Importance of both spin and orbital fluctuations in BaFe2(As1-xPx)2 : Evidence from superconducting gap anisotropy
T. Yoshida, S. Ideta, T. Shimojima +32
In the iron pnictide superconductors, two distinct unconventional mechanisms of superconductivity have been put forth: One is mediated by spin fluctuations leading to the s+- state…
Anisotropy of the in-plane resistivity of underdoped Ba(FeCo)As superconductors induced by impurity scattering in the antiferromagnetic orthorhombic phase
S. Ishida, M. Nakajima, T. Liang +8
We investigated the in-plane resistivity anisotropy for underdoped Ba(FeCo)As single crystals with improved quality. We demonstrate that the anisotropy in resis…
Anomalous two peak structure in the Angle-resolved Photoemission Spectra of Ba1-xKxFe2As2
T. Shimojima, W. Malaeb, K. Ohgushi +13
The electronic structure near the Fermi level (EF) of Ba1-xKxFe2As2 (BaK122 ; x = 0.2 - 0.7) is studied using laser ultrahigh-resolution angle-resolved photoemission spectroscopy(A…
Dependence of carrier doping on the impurity potential in transition-metal-substituted FeAs-based superconductors
S. Ideta, T. Yoshida, I. Nishi +15
In order to examine to what extent the rigid-band-like electron doping scenario is applicable to the transition metal-substituted Fe-based superconductors, we have performed angle-…
Structural quantum criticality and superconductivity in iron-based superconductor Ba(Fe1-xCox)2As2
Masahito Yoshizawa, Daichi Kimura, Taiji Chiba +8
We investigated the elastic properties of the iron-based superconductor Ba(Fe1-xCox)2As2 with eight Co concentrations. The elastic constant C66 shows large elastic softening associ…