大阪大学 田島研究室

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田島研究室でこれまで得られた研究成果の一部をご紹介します。
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Bi2Sr2CaCu2Ozにおける電子ラマン散乱スペクトルとARPESの定量的比較:ギャップ構造の研究
“Quantitative Comparison between Electronic Raman Scattering and Angle-Resolved Photoemission Spectra in Bi2Sr2CaCu2O8+δ Superconductors: Doping Dependence of Nodal and Antinodal Superconducting Gaps”
K. Tanaka, N. Hieu, G. Vincini, T. Masui, S. Miyasaka, S. Tajima and T. Sasagawa
J. Phys. Soc. Jpn., 88, 044710 (2019).

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Sr2VFeAsO3におけるVサイトのCr置換効果
“Effect of Cr substitution for V in Sr2VFeAsO3
T. Wakimura, H. Yokota, M. Nakajima, S. Miyasaka, S. Tajima
Supercond. Sci. & Tech., 32, 064003-1-5 (2019).

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Bi2Sr2Ca2Cu3Ozのラマン散乱測定から見た銅酸化物超伝導体の多層効果
“Double pair- breaking peak in Raman scattering spectra of the triple-layer cuprate Bi2Sr2Ca2Cu3Oz
G. Vincini, K. Tanaka, T. Adachi, L. Sobirey, S. Miyasaka, S. Tajima, S. Adachi, N. Sasaki and T. Watanabe
Phys. Rev. B, 98, 144503 (2018).

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鉄系超伝導体における二つのTc上昇メカニズムに関連したフェルミ面の変化
"Change of Fermi surface states related with two different Tc-raising mechanisms in iron pnictide superconductorsn"
A. Takemori, T. Hajiri, S. Miyasaka, Z. H. Tin, T. Adachi, S. Ideta, K. Tanaka, M. Matsunami and S. Tajima
Phys. Rev. B, 98, 100501 (2018).

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122系鉄系超伝導体の面間輸送特性
"Comprehensive study of out-of-plane transport properties in BaFe2As2: Three-dimensional electronic state and effect of chemical substitution"
M. Nakajima, M. Nagafuchi, and S. Tajima
Phys. Rev. B, 97, 094511 (2018).

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電子ドープ型銅酸化物超伝導体の光学的研究:電子相図の見直し
"Optical study of electron-doped cuprate Pr1.3-xLa0.7CexCuO4+δ in underdoped regime: Revisit the phase diagram"
R. Ohnishi, M. Nakajima, S. Miyasaka, S. Tajima, T. Adachi, T. Ohgi, A, Takahashi, Y. Koike
J. Phys. Soc. Jpn., 87, 043705 (2018).

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鉄化合物超伝導体1111系の電子相図
"Three superconducting phases with different categories of pairing in holeand electron-doped LaFeAs1−xPxO"
S. Miyasaka, M. Uekubo, H. Tsuji, M. Nakajima, and S. Tajima
Phys. Rev. B, 95, 214515 (2017).

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FeSeの軌道秩序状態における電荷ダイナミクス
"Gradual Fermi-surface modification in orbitally ordered state of FeSe revealed by optical spectroscopy"
M. Nakajima, K. Yanase, F. Nabeshima, Y. Imai, A. Maeda, and S. Tajima
Phys. Rev. B, 95, 184502 (2017).

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面内光学測定による超伝導前駆現象の観測
"Investigation of Precursor Superconducting State in YBa2Cu3O7-δ through In-Plane Optical Spectroscopy"
K. Lee, K. Kamiya, M. Nakajima, S. Miyasaka and S. Tajima
J. Phys. Soc. Jpn., 86, 023701 (2017).

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Ba(Fe,TM)2As2(TM = Cr, Mn, Co)の面内光学応答
"Carrier localization due to local magnetic order induced by magnetic impurities in Ba(Fe1-xTMx)2As2 (TM = Mn and Cr) as seen via optical spectra"
T. Kobayashi, M. Nakajima, S. Miyasaka, and S. Tajima
Phys. Rev. B, 94, 224516 (2016).

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鉄系超伝導体122系における結晶構造と超伝導の関係
"Effects of c/a Anisotropy and Local Crystal Structure on Superconductivity in AFe2(As1-xPx)2 (A = Ba1-ySry, Sr1-yCay and Eu)"
T. Adachi, Y. Nakamatsu, T. Kobayashi, S. Miyasaka, S. Tajima, M. Ichimiya, M. Ashida, H. Sagayama, H. Nakao, R. Kumai, Y. Murakami
J. Phys. Soc. Jpn., 85, 063705 (2016).

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鉄化合物超伝導体SrFe2As2のフォノン分散
"Effect of magnetism on lattice dynamics in SrFe2As2 using high-resolution inelastic x-ray scattering"
N. Murai, T. Fukuda, T. Kobayashi, M. Nakajima, H. Uchiyama, D. Ishikawa, S. Tsutsui, H. Nakamura, M. Machida, S. Miyasaka, S. Tajima, and A. Q. R. Baron
Phys. Rev. B, 93, 020301(R) (2016). (Editors suggested paper)
プレスリリース:大阪大学理学研究科物理学専攻

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Ba(Fe1-xTMx)2As2 (TM = Cr, Mn, and Co)の面内電気抵抗率の異方性に対するフェルミ面のトポロジーの重要性
"Importance of Fermi Surface Topology for In-Plane Resistivity Anisotropy in Hole- and Electron-Doped Ba(Fe1-xTMx)2As2 (TM = Cr, Mn, and Co)"
T. Kobayashi, K. Tanaka, S. Miyasaka, S. Tajima
J. Phys. Soc. Jpn. 84, 094707 (2015).

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鉄系超伝導体LaFeP1-xAsxOにおける2つの反強磁性状態と超伝導状態
"Evolution of the phase diagram of LaFeP1-xAsxO1- yFy ( y = 0.0.1)"
K. T. Lai, A. Takemori, S. Miyasaka, F. Engetsu, H. Mukuda, S. Tajima,
Phys. Rev. B, 90, 064504 (2014).

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SrFe2(As1-xPx)2における電子相図に対する結晶構造の影響
"Electronic Phase Diagram of SrFe2(As1-xPx)2: Effect of the Structural Dimensionality"
T. Kobayashi, S. Miyasaka, S. Tajima, N. Chikumoto
J. Phys. Soc. Jpn., 83, 104702 (2014).

topics_ece2013.jpg c軸偏光光学スペクトルによる擬ギャップ及び超伝導前駆現象の研究
"Coexistence of the pseudogap and the superconducting gap revealed by the c-axis optical study of YBa2(Cu1-xZnx)3O7-δ"
E. Uykur, K. Tanaka, T. Masui, S. Miyasaka, S. Tajima,
J. Phys. Soc. Jpn., 82, 033701 (2013).
"Persistence of superconducting condensate far above the critical temperature in YBa2(Cu1-xZnx)3Oy revealed by c-axis optical conductivity measurements for several Zn-concentrations and carrier-doping levels"
E. Uykur, K. Tanaka, T. Masui, S. Miyasaka, S. Tajima,
Phys. Rev. Lett., 112, 127003 (2014).


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RFeP1-xAsxO0.9F0.1 (R=La,Pr,Nd)における2つのフェルミ面状態とTc上昇機構
"Two Fermi Surface States and Two Tc-Rising Mechanisms Revealed by Transport Properties in RFeP1-xAsxO0.9F0.1 (R = La, Pr, and Nd)"
S. Miyasaka, A. Takemori, T. Kobayashi, S. Suzuki, S. Saijo, S. Tajima,
J. Phys. Soc. Jpn., 82, 124706 (2013).

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銅酸化物超伝導体YBa2Cu3O7における同位体置換効果
"Absence of the 1/8 anomaly in the oxygen isotope effect of YBa2Cu3Oy"
K. Kamiya, T. Masui, S. Tajima, H. Bando, Y. Aiura,
Phys. Rev. B 89, 060505(R) (2014).


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鉄ニクタイド超伝導体SrFe2(As1-xPx)2におけるアニールによる結晶構造、電子状態変化
"Change of electronic state and crystal structure by postannealing in superconducting SrFe2(As0.65P0.35)2"
T. Kobayashi, S. Miyasaka, S. Tajima, T. Nakano, Y. Nozue, N. Chikumoto, H. Nakao, R. Kumai, and Y. Murakami,
Phys. Rev. B 87, 174520 (2013).

topics_murai2012_2.jpg 電子ラマン散乱で見た Bi2+xSr2-xCaCu2O8+d (Bi2212) の
超伝導ギャップへの面外乱れ効果

"Effect of out-of-plane disorder on superconducting gap anisotropy in Bi2+xSr2-xCaCu2O8+d as seen via Raman spectroscopy"
N. Murai, T. Masui, M. Ishikado, S. Ishida, H. Eisaki, S. Uchida, and S. Tajima,
Phys. Rev. B, 85, 020507(R) (2012).

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ペロブスカイト型V酸化物の磁気・軌道秩序に対するランダムネス効果
"Effect of cation size variance on spin and orbital order in Eu1-x(La0.2542Y0.7458)xVO3"
R. Fukuta, S. Miyasaka, K. Hemmi, S. Tajima, D. Kawana, K. Ikeuchi, Y. Yamasaki, A. Nakao, H. Nakao, Y. Murakami, K. Iwasa,
Phys. Rev. B 84, 140409(R) (2011).

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Ba1-xKxBiO3におけるフォノンのソフト化
"Softening of bond-stretching phonon mode in Ba1-xKxBiO3 at the metal-insulator transition"
H. Khosroabadi, S. Miyasaka, J. Kobayashi, K. Tanaka, S. Tajima, H. Uchiyama, A. Q. R. Baron,
Phys. Rev. B 83, 224525 (2011).

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(Y,Ca)Ba2Cu3O7-dの光学スペクトルによる銅酸化物高温超伝導体の
過剰ドープ電子状態の研究

"In-plane optical spectra of overdoped Y1-xCaxBa2Cu3O7-d: Overdoping and disorder effects on residual conductivity"
E. Uykur, K. Tanaka, T. Masui, S. Miyasaka, S. Tajima,
Phys. Rev. B 84, 184527 (2011).


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不足ドープYBCOのB1g電子ラマン散乱
"Electronic Raman spectra of slightly underdoped YBa2Cu3O7-d: Unusual behavior of antinodal electrons"
H. Tadatomo, T. Masui, S. Tajima,
Phys. Rev. B, 82, 224503 (2010).


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YBCOの超伝導電子ラマン散乱のキャリア濃度依存性
"Electronic crossover in the overdoped high-temperature (Y,Ca)Ba2Cu3Oy superconductor by Raman scattering"
T. Masui, T. Hiramachi, K. Nagasao, S Tajima,
Phys. Rev. B, 79, 014511 (2009).


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MgB2のMn置換効果 II
"Mn Substitution Effect in Two-Gap Superconductor MgB2"
T. Masui, N. Suemitsu, Y. Mikasa, S. Lee, S. Tajima,
J. Phys. Soc. Jpn., 77, 074720 (2008).


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MgB2のMn置換効果
"Mn substitution effect on superconducting properties of MgB2 single crystals"
T. Masui, M. F. Limonov, H. Uchiyama, S. Tajima, and A. Yamanaka,
Physica C, 445-448, 39-41 (2006).

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YBCOの電子ラマンに見られた量子干渉効果
"Negative quantum interference between the electronic Raman scattering processes of CuO-chain and CuO2-plane in heavily overdoped (Y,Ca)Ba2Cu3O7-δ"
T. Masui, M. F. Limonov, H. Uchiyama, S. Tajima, and A. Yamanaka,
Phys. Rev. Lett., 95, 207001 (2005).

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