M. Kato

We have performed Compton scattering measurements on as-grown and reduced single crystals of the electron-doped T'-cuprate Pr1.3-xLa0.7CexCuO4 (x = 0.10) to investigate the effect…

cond-mat.supr-con2021

Reduction annealing effects on the crystal structure of $T^{'}$ -type La $_{1.8}$ Eu $_{0.2}$ CuO $_{4 + α - δ}$

Masaki Fujita, Takanori Taniguchi, Shuki Torii +7

We performed neutron powder diffraction measurements on the as-sintered (AS) and oxygen-reduced (OR) La $_{1.8}$ Eu $_{0.2}$ CuO $_{4 + α - δ}$ (LECO). The structural parameters for oxygens…

cond-mat.supr-con2020★ 7 cited

Synthesis of New Lithium- and Monoamine-Intercalated Superconductors Li $_{x}$ (C $_{n}$ H $_{2 n + 3}$ N) $_{y}$ Fe $_{1 - z}$ Se ( $n$ = 6, 8, 18) with the Dramatically Expanded Interlayer Spacing

Chika Sakamoto, Takashi Noji, Kazuki Sato +2

New superconductors, Li $_{x}$ (C $_{n}$ H $_{2 n + 3}$ N) $_{y}$ Fe $_{1 - z}$ Se ( $n$ = 6, 8, 18), have been synthesized via the co-intercalation of linear monoamines together with Li into FeSe. The…

cond-mat.supr-con2020★ 7 cited

Electron-Doping Effect on Tc in the Undoped (Ce-Free) Superconductor T'-La1.8Eu0.2CuO4 Studied by the Fluorine Substitution for Oxygen

Toshiki Sunohara, Takayuki Kawamata, Kota Shiosaka +4

We have succeeded in synthesizing electron-doped polycrystalline bulk samples of T'-La1.8Eu0.2CuO4-yFy (y = 0 - 0.15) by the fluorination of undoped (Ce-free) T'-La1.8Eu0.2CuO4 usi…

cond-mat.supr-con2018★ 4 cited

New Lithium- and Diamine-Intercalated Superconductors Lix(CnH2n+4N2)yMoSe2 (n = 2, 6)

Kazuki Sato, Takashi Noji, Takehiro Hatakeda +3

We have succeeded in synthesizing new intercalation superconductors Lix(C2H8N2)yMoSe2 and Lix(C6H16N2)yMoSe2 with Tc = 4.2 and 3.8-6.0 K, respectively, via the co-intercalation of…

cond-mat.supr-con2017★ 18 cited

New Lithium- and Diamines-Intercalated Superconductors Li $_{x}$ (C $_{2}$ H $_{8}$ N $_{2}$ ) $_{y}$ TiSe $_{2}$ and Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ TiSe $_{2}$

Kazuki Sato, Takashi Noji, Takehiro Hatakeda +3

New intercalation superconductors of Li $_{x}$ (C $_{2}$ H $_{8}$ N $_{2}$ ) $_{y}$ TiSe $_{2}$ and Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ TiSe $_{2}$ with $T_{c}$ = 4.2 K have successfully been synthesized via…

cond-mat.supr-con2016★ 26 cited

New Alkali-Metal- and 2-Phenethylamine-Intercalated Superconductors $A_{x}$ (C $_{8}$ H $_{11}$ N) $_{y}$ Fe $_{1 - z}$ Se ( $A$ = Li, Na) with the Largest Interlayer Spacings and $T_{c}$ $\sim$ 40 K

Takehiro Hatakeda, Takashi Noji, Kazuki Sato +3

New FeSe-based intercalation superconductors, $A_{x}$ (C $_{8}$ H $_{11}$ N) $_{y}$ Fe $_{1 - z}$ Se ( $A$ = Li, Na), with $T_{c}$ = 39-44 K have been successfully synthesized via the interca…

cond-mat.supr-con2016★ 8 cited

Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T'-La $_{1.8}$ Eu $_{0.2}$ CuO $_{4}$

Koki Ohashi, Takayuki Kawamata, Tomohisa Takamatsu +3

We have investigated the effects of magnetic Ni and nonmagnetic Zn impurities on the superconductivity in undoped T'-La $_{1.8}$ Eu $_{0.2}$ CuO $_{4}$ (T'-LECO) with the Nd $_{2}$ CuO $_{4}$ -ty…

cond-mat.supr-con2016★ 12 cited

Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ : Dependence on the Intercalation Temperature and Lithium Content

Shohei Hosono, Takashi Noji, Takehiro Hatakeda +3

The superconductivity and intercalation statein the lithium-and hexamethylenediamine (HMDA)-intercalated superconductor Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ have been inv…

cond-mat.supr-con2016★ 42 cited

New Superconducting Phase of Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ with $T_{c}$ = 41 K Obtained through the Post-Annealing

Shohei Hosono, Takashi Noji, Takehiro Hatakeda +3

Post-annealing effects on the crystal structure and superconductivity of the lithium- and hexamethylenediamine (HMDA)-intercalated superconductor Lix(C6H16N2)yFe2-zSe2 have been in…

cond-mat.supr-con2015★ 34 cited

Strong electron correlation behind the superconductivity in Ce-free and Ce-underdoped high-Tc T'-cuprates

T. Adachi, A. Takahashi, K. M. Suzuki +9

In order to investigate the electronic state of Ce-free and Ce-underdoped high-Tc cuprates with the so-called T' structure, we have performed muon-spin-relaxation (muSR) and specif…

cond-mat.supr-con2015★ 13 cited

Resistive superconducting transition and effects of atmospheric exposure in the intercalation superconductor Ax(C2H8N2)yFe2-zSe2 (A = Li, Na)

T. Hatakeda, T. Noji, S. Hosono +3

We have succeeded in observing zero-resistivity in newly discovered intercalation superconductors Ax(C2H8N2)yFe2-zSe2 (A = Li, Na) with Tc = 45 K, using the sintered pellet samples…

cond-mat.supr-con2015★ 65 cited

New intercalation superconductor Lix(C6H16N2)yFe2-zSe2 with a very large interlayer-spacing and Tc = 38 K

S. Hosono, T. Noji, T. Hatakeda +3

A new iron-based superconductor, Lix(C6H16N2)yFe2-zSe2, with Tc = 38 K has successfully been synthesized via the intercalation of lithium and hexamethylenediamine into FeSe. The su…

cond-mat.supr-con2014★ 84 cited

Synthesis and post-annealing effects of alkaline-metal-ethylenediamine-intercalated superconductors Ax(C2H8N2)yFe2-zSe2 (A = Li, Na) with Tc = 45 K

Takashi Noji, Takehiro Hatakeda, Shohei Hosono +3

New iron-based intercalation superconductors Ax(C2H8N2)yFe2-zSe2 (A = Li, Na) with Tc = 45 K have successfully been synthesized via intercalation of dissolved alkaline metal in eth…

cond-mat.supr-con2013★ 87 cited

New Li-Ethylenediamine-Intercalated Superconductor Li $_{x}$ (C $_{2}$ H $_{8}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ with $T_{c}$ = 45 K

Takehiro Hatakeda, Takashi Noji, Takayuki Kawamata +2

A new iron-based superconductor Li $_{x}$ (C $_{2}$ H $_{8}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ with $T_{c}$ = 45 K has successfully been synthesized via intercalation of dissolved lithium metal in ethy…

cond-mat.supr-con2013★ 81 cited

Evolution of the electronic state through the reduction annealing in electron-doped Pr_1.3-x_La_0.7_Ce_x_CuO_4+delta_ (x=0.10) single crystals: Antiferromagnetism, Kondo effect and superconductivity

T. Adachi, Y. Mori, A. Takahashi +5

The evolution of the electronic state through the reduction annealing has been investigated in electron-doped Pr_1.3-x_La_0.7_Ce_x_CuO_4+delta_ (x=0.10) single crystals with the so…

cond-mat.supr-con2011★ 41 cited

Specific-heat study of superconducting and normal states in FeSe1-xTex (0.6<=x<=1) single crystals: Strong-coupling superconductivity, strong electron-correlation, and inhomogeneity

T. Noji, M. Imaizumi, T. Suzuki +3

The electronic specific heat of as-grown and annealed single-crystals of FeSe1-xTex (0.6<=x<=1) has been investigated. It has been found that annealed single-crystals with x=0.6-0.…

cond-mat.supr-con2010

Growth, Annealing Effects on Superconducting and Magnetic Properties and Anisotropy of FeSe_1-x_Te_x_ (0.5 =< x =< 1) Single Crystals

Takashi Noji, Takumi Suzuki, Haruki Abe +3

Single crystals of FeSe_1-x_Te_x_ (0.5=<x=<1) have been grown by the Bridgman method. After annealing them at 400 deg for 100 h in vacuum, single crystals of x=0.5-0.9 have exhibit…

cond-mat.supr-con2004★ 11 cited

New Electron-Doped Superconducting Cuprate Li_x_Sr_2_CuO_2_Br_2_

Tetsuya Kajita, Masatsune Kato, Takashi Suzuki +3

A new electron-doped superconductor Li_x_Sr_2_CuO_2_Br_2_ with x = 0.15 has successfully been synthesized by an electrochemical Li-intercalation technique. The magnetic susceptibil…

Electronic State of T'-Pr1.3−x​La0.7​Cex​CuO4​ (x=0.10) Studied by Compton Scattering

Reduction annealing effects on the crystal structure of T′-type La1.8​Eu0.2​CuO4+α−δ​

Synthesis of New Lithium- and Monoamine-Intercalated Superconductors Lix​(Cn​H2n+3​N)y​Fe1−z​Se (n = 6, 8, 18) with the Dramatically Expanded Interlayer Spacing