230 citations · 2.2k across the 46 of their papers we have counts for
14 papers · 1 filter
Superconductivity in High-Entropy Antimonide MPtSb (M = equimolar Ru, Rh, Pd, and Ir)
Daigorou Hirai, Naoto Uematsu, Koh Saitoh +2
The high-entropy concept was applied to the synthesis of transition-metal antimonides, M1-xPtxSb (M = equimolar Ru, Rh, Pd, and Ir). High-entropy antimonide samples crystallized in…
Various arsenic network structures in 112-type Ca1-xLaxFe1-yPdyAs2 revealed by synchrotron x-ray diffraction experiments
Shinya Tamura, Naoyuki Katayama, Yuto Yamada +3
Two novel 112-type palladium doped iron arsenides were synthesized and identified using comprehensive studies involving synchrotron x-ray diffraction and x-ray absorption near edge…
Synchrotron X-ray Diffraction Study of Structural Phase Transition in Ca10(Ir4As8)(Fe2-xIrxAs2)
Naoyuki Katayama, Kento Sugawara, Yuki Sugiyama +6
We report a structural transition found in Ca10(Ir4As8)(Fe2-xIrxAs2)5, which exhibits superconductivity at 16 K. The c-axis parameter is doubled below a structural transition tempe…
Iridium Orbital Crossover at the Structural Phase Transition in Ca10(Ir4As8)(Fe2-xIrxAs2)5
Kento Sugawara, Naoyuki Katayama, Yuki Sugiyama +5
We report a structural transition found in Ca10(Ir4As8)(Fe2-xIrxAs2)5, which exhibits superconductivity at 16 K, with a layer of divalent iridium coordinated by arsenic in between…
Superconductivity in Ca1-xLaxFeAs2: A Novel 112-Type Iron Pnictide with Arsenic Zigzag Bonds
Naoyuki Katayama, Kazutaka Kudo, Seiichiro Onari +9
We report superconductivity in the novel 112-type iron-based compound Ca1-xLaxFeAs2. Single-crystal X-ray diffraction analysis revealed that the compound crystallizes in a monoclin…
Superconductivity in Ca10(Ir4As8)(Fe2As2)5 with Square-Planar Coordination of Iridium
Kazutaka Kudo, Daisuke Mitsuoka, Masaya Takasuga +10
We report the unprecedented square-planar coordination of iridium in the iron iridium arsenide Ca10(Ir4As8)(Fe2As2)5. This material experiences superconductivity at 16 K. X-ray pho…
Pressure-induced changes in the magnetic and valence state of EuFe2As2
K. Matsubayashi, K. Munakata, N. Katayama +9
We present the results of electrical resistivity, ac specific heat, magnetic susceptibility, X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) of the…
Investigation of the spin-glass regime between the antiferromagnetic and superconducting phases in FeSeTe
N. Katayama, S. Ji, D. Louca +12
Using bulk magnetization along with elastic and inelastic neutron scattering techniques, we have investigated the phase diagram of FeSeTe and the nature of ma…
Coupling of spin and orbital excitations in the iron-based superconductor FeSe(0.5)Te(0.5)
S. -H. Lee, Guangyong Xu, W. Ku +16
We present a combined analysis of neutron scattering and photoemission measurements on superconducting FeSe(0.5)Te(0.5). The low-energy magnetic excitations disperse only in the di…
The local atomic structure of superconducting Fe-Se-Te
Martin C. Lehman, Despina Louca, Kazumasa Horigane +9
We report on the first local atomic structure study via the pair density function (PDF) analysis of neutron diffraction data and show a direct correlation of local coordinates to T…
Intrinsic Properties of AFe2As2 (A = Ba, Sr) Single Crystal under Highly Hydrostatic Pressure Conditions
Kazuyuki Matsubayashi, Naoyuki Katayama, Kenya Ohgushi +4
We measured the electrical resistivity and ac magnetic susceptibility of BaFe2As2 and SrFe2As2 single crystals under pressure using a cubic anvil apparatus. For BaFe2As2, the antif…
Spontaneous formation of a superconducting and antiferromagnetic hybrid state in SrFe2As2 under high pressure
K. Kitagawa, N. Katayama, H. Gotou +5
We report a novel superconducting (SC) and antiferromagnetic (AF) hybrid state in SrFe2As2 revealed by 75As nuclear magnetic resonance (NMR) experiments on a single crystal under h…
Orbital-dependent modifications of electronic structure across magneto-structural transition in BaFe2As2
T. Shimojima, K. Ishizaka, Y. Ishida +12
Laser angle-resolved photoemission spectroscopy (ARPES) is employed to investigate the temperature (T) dependence of the electronic structure in BaFe2As2 across the magneto-structu…
Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal
Kentaro Kitagawa, Naoyuki Katayama, Kenya Ohgushi +2
We report results of 75As nuclear magnetic resonance (NMR) experiments on a self-flux grown single crystal of BaFe2As2. A first-order antiferromagnetic (AF) transition near 135 K w…