Y. Kitaoka

Multiband Superconductivity in Heavy Fermion Compound CePt3Si without Inversion Symmetry: An NMR Study on a High-Quality Single Crystal (2008)

Mukuda, H., Nishide, S., Harada, A., Iwasaki, K., Yogi, M., Yashima, M., ...

We report on novel superconducting characteristics of the heavy fermion (HF) superconductor CePt3Si without inversion symmetry through 195Pt-NMR study on a single crystal with T_c= 0.46 K that is...

Genuine Phase Diagram of Homogeneously Doped CuO2 Plane in High-Tc Cuprate Superconductors (2008)

Mukuda, H., Yamaguchi, Y., Shimizu, S., Kitaoka, Y., Shirage, P. M., Iyo, A.

We report a genuine phase diagram for a disorder-free CuO_2 plane based on the precise evaluation of the local hole density (N_h) by site-selective Cu-NMR studies on five-layered high-Tc cuprates. It...

Spin Fluctuations and Unconventional Superconductivity in the Fe-based Oxypnictide Superconductor LaFeAsO_0.7 probed by 57Fe-NMR (2008)

Terasaki, N., Mukuda, H., Yashima, M., Kitaoka, Y., Miyazawa, K., Shirage, P. M., ...

We report $^{57}$Fe-NMR studies on the oxygen-deficient iron (Fe)-based oxypnictide superconductor LaFeAsO$_{0.7}$ ($T_{c}=$ 28 K) enriched by $^{57}$Fe isotope. In the superconducting state, the...

Evolution of an Unconventional Superconducting State inside the Antiferromagnetic Phase of CeNiGe$_3$ under Pressure: a $^{73}$Ge-Nuclear-Quadrupole-Resonance Study (2008)

Harada, A., Mukuda, H., Kitaoka, Y., Thamizhavel, A., Okuda, Y., Settai, R., ...

We report a $^{73}$Ge nuclear-quadrupole-resonance (NQR) study on novel evolution of unconventional superconductivity in antiferromagnetic (AFM) CeNiGe$_3$. The measurements of the $^{73}$Ge-NQR...

75As NQR/NMR Studies on Oxygen-deficient Iron-based Oxypnictide Superconductors LaFeAsO_{1-y} (y=0,0.25,0.4) and NdFeAsO_{0.6} (2008)

Mukuda, H., Terasaki, N., Kinouchi, H., Yashima, M., Kitaoka, Y., Suzuki, S., ...

We report 75As-NQR/NMR studies on the oxygen-deficient iron(Fe)-based oxypnictide superconductors LaFeAsO_{0.6} (T_c=28 K) along with the results on LaFeAsO, LaFeAsO_{0.75}(T_c=20 K) and...

Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An 115In-NQR study under pressure (2008)

Kawasaki, S., Yashima, M., Kitaoka, Y., Takeda, K., Shimizu, K., Oishi, Y., ...

We report on the pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3 by means of nuclear-quadrupole-resonance (NQR) studies conducted under a high pressure....

Enhancement of Superconducting Transition Temperature due to the strong Antiferromagnetic Spin Fluctuations in Non-centrosymmetric Heavy-fermion Superconductor CeIrSi3 :A 29Si-NMR Study under Pressure (2008)

Mukuda, H., Fujii, T., Ohara, T., Harada, A., Yashima, M., Kitaoka, Y., ...

We report a 29Si-NMR study on the pressure-induced superconductivity (SC) in an antiferromagnetic (AFM) heavy-fermion compound CeIrSi3 without inversion symmetry. In the SC state at P=2.7-2.8 GPa,...

Evidence for ferromagnetic spin-pairing superconductivity in UGe$_2$: A $^{73}$Ge-NQR study under pressure (2007)

Harada, A., Kawasaki, S., Mukuda, H., Kitaoka, Y., Haga, Y., Yamamoto, E., ...

We report that a novel type of superconducting order parameter has been realized in the ferromagnetic states in UGe$_2$ via $^{73}$Ge nuclear-quadrupole-resonance (NQR) experiments performed under...

Uniform Mixing of Antiferromagnetism and High-Tc Superconductivity in Electron-doped Layers in Four-layered Ba2Ca3Cu4O8F2 : A New Phenomenon in an Electron Underdoped RegimePhenomenon in an Electron Underdoped Regime (2007)

Shimizu, S., Mukuda, H., Kitaoka, Y., Iyo, A., Tanaka, Y., Kodama, Y., ...

We report Cu- and F-NMR studies on a four-layered high-temperature superconductor Ba2Ca3Cu4O8F2(0234F(2.0)) with apical fluorine (F-1), an undoped 55 K-superconductor with a nominal Cu2+ valence on...

Two-Staged Magnetoresistance Driven by Ising-like Spin Sublattice in SrCo6O11 (2007)

Ishiwata, S., Terasaki, I., Ishii, F., Nagaosa, N., Mukuda, H., Kitaoka, Y., ...

A two-staged, uniaxial magnetoresistive effect has been discovered in SrCo6O11 having a layered hexagonal structure. Conduction electrons and localized Ising spins are in different sublattices but...

Multigap Superconductivity in Y$_2$C$_3$: A $^{13}$C-NMR Study (2006)

Harada, A., Akutagawa, S., Miyamichi, Y., Mukuda, H., Kitaoka, Y., Akimitsu, J.

We report on the superconducting (SC) properties of Y$_2$C$_3$ with a relatively high transition temperature $T_{\rm c}=15.7$ K investigated by $^{13}$C nuclear-magnetic-resonance (NMR) measurements...

Multiband Superconductivity in Filled-Skutterudite Compounds (Pr_{1-x}La_{x})Os_{4}Sb_{12}: An Sb Nuclear-Quadruple-Resonance (NQR) Study (2006)

Yogi, M., Nagai, T., Imamura, Y., Mukuda, H., Kitaoka, Y., Kikuchi, D., ...

We report on Sb nuclear-quadrupole-resonance (NQR) study in filled-skutterudite compounds (Pr_1-xLa_x)Os_4Sb_12. The Sb-NQR spectra have split into two sets, arising from different Sb_12 cages...

Microscopic Evidence for Evolution of Superconductivity by Effective Carrier Doping in Boron-doped Diamond:11B-NMR study (2006)

Mukuda, H., Tsuchida, T., Harada, A., Kitaoka, Y., Takenouchi, T., Takano, Y., ...

We have investigated the superconductivity discovered in boron (B)-doped diamonds by means of 11B-NMR on heteroepitaxially grown (111) and (100) films. 11B-NMR spectra for all of the films are...

Evidence for unconventional superconducting fluctuations in heavy-fermion compound CeNi2Ge2 (2006)

Kawasaki, S., Sada, T., Miyoshi, T., Kotegawa, H., Mukuda, H., Kitaoka, Y., ...

We present evidence for unconventional superconducting fluctuations in a heavy-fermion compound CeNi$_2$Ge$_2$. The temperature dependence of the $^{73}$Ge nuclear-spin-lattice-relaxation rate...

Uniform Mixing of High-Tc Superconductivity and Antiferromagnetism on a Single CuO2 Plane in Hg-based Five-layered Cuprate (2006)

Mukuda, H., Abe, M., Araki, Y., Kitaoka, Y., Tokiwa, K., Watanabe, T., ...

We report a site selective Cu-NMR study on under-doped Hg-based five-layered high-$T_{\rm c}$ cuprate HgBa2Ca4Cu5Oy with a Tc=72 K. Antiferromagnetism (AF) has been found to take place at TN=290 K,...

CePt3Si: Heavy Fermion Superconductivity and Magnetic Order without Inversion Symmetry (2006)

Bauer, E., Bonalde, I., Eichler, A., Hilscher, G., Kitaoka, Y., Lackner, R., ...

Unconventional superconductivity and magnetism in CePt3Si1-xGex (2005)

Bauer, E, Hilscher, G, Michor, H, Sieberer, M, Scheidt, E W, Gribanov, A, ...

Unconventional superconductivity and magnetism in CePt3Si1-xGex (2005)

Bauer,E., Hilscher,G., Michor,H., Sieberer,M., Scheidt,E. W., Gribanov,A., ...

Unconventional superconductivity and magnetism in CePt3Si1-xGex (2005)

Bauer, E., Hilscher, G., Michor, H., Sieberer, M., Scheidt, E. W., Gribanov, A., ...

Motion capture from demonstrator's viewpoint and its application to robot teaching (2005)

Yokokohji, Y, Kitaoka, Y, Yoshikawa, T

Evidence for Uniform Coexistence of Ferromagnetism and Unconventional Superconductivity in UGe_2: A ^73Ge-NQR Study under Pressure (2004)

Kotegawa, H., Harada, A., Kawasaki, S., Kawasaki, Y., Kitaoka, Y., Haga, Y., ...

We report on the itinerant ferromagnetic superconductor UGe_2 through ^73Ge-NQR measurements under pressure (P). The P dependence of the NQR spectrum signals a first-order transition from the...

Unconventional Superconductivity in Heavy Fermion Systems (2004)

Kitaoka, Y., Kawasaki, S., Mito, T., Kawasaki, Y.

We review the studies on the emergent phases of superconductvity and magnetism in the $f$-electron derived heavy-fermion (HF) systems by means of the nuclear-quadrupole-resonance (NQR) under...

Unconventional superconductivity and magnetism in $\rm CePt_3Si_{1-x}Ge_x$ (2004)

Bauer, E., Hilscher, G., Michor, H., Sieberer, M., Scheidt, E. W., Gribanov, A., ...

$\rm CePt_3Si$ is a novel ternary compound exhibiting antiferromagnetic order at $T_N \approx 2.2$ K and superconductivity (SC) at $T_c \approx 0.75$ K. Large values of $H_{c2}' \approx -8.5$ T/K and...

Coexistence of antiferromagnetic order and unconventional superconductivity in heavy fermion compounds CeRh_{1-x}Ir_xIn_5: nuclear quadrupole resonance studies (2004)

Yamaguchi, N., Kan, H., Kitaoka, Y., Sarrao, J. L., Pagliuso, P. G., ...

We present a systematic ^{115}In NQR study on the heavy fermion compounds CeRh_{1-x}Ir_xIn_5 (x=0.25, 0.35, 0.45, 0.5, 0.55 and 0.75). The results provide strong evidence for the microscopic...

Evidence for a Novel State of Superconductivity in Noncentrosymmetric CePt3Si : A 195Pt-NMR Study (2004)

Yogi, M., Kitaoka, Y., Hashimoto, S., Yasuda, T., Settai, R., Matsuda, T. D., ...

We report on novel antiferromagnetic (AFM) and superconducting (SC) properties of noncentrosymmetric CePt3Si through measurements of the 195Pt nuclear spin-lattice relaxation rate 1/T_1. In the...

Novel superconductivity on the magnetic criticality in heavy-fermion systems : a systematic study of NQR under pressure (2004)

Kitaoka, Y., Kawasaki, S., Kawasaki, Y., Mito, T.

We report the discovery of exotic superconductivity (SC) and novel magnetism in heavy-fermion (HF) compounds, CeCu$_2$Si$_2$, CeRhIn$_5$ and CeIn$_3$ through nuclear-quadrupole-resonance (NQR)...

Coexistence of Superconductivity and Antiferromagnetism in Multilayered High-$T_c$ Superconductor HgBa$_2$Ca$_4$Cu$_5$O$_y$: A Cu-NMR Study (2004)

Kotegawa, H., Tokunaga, Y., Araki, Y., Kitaoka, Y., Tokiwa, K., ...

We report a coexistence of superconductivity and antiferromagnetism in five-layered compound HgBa$_2$Ca$_4$Cu$_5$O$_y$ (Hg-1245) with $T_c=108$ K, which is composed of two types of CuO$_2$ planes in...

Exotic Superconductivity in the Coexistent Phase of Antiferromagnetism and Superconductivity in CeCu2(Si0.98Ge0.02)2: A Cu-NQR Study under Hydrostatic Pressure (2004)

Kawasaki,Y., Ishida,K. J., Kawasaki,S. J., Mito,T., Kitaoka,Y., ...

Novel superconductivity and magnetism in CePt3Si (2004)

Bauer, E, Hilscher, G, Michor, H, Sieberer, M, Scheidt, EW, Gribanov, A, ...

Novel superconductivity and magnetism in CePt3Si (2004)

Bauer,E., Hilscher,G., Michor,H., Sieberer,M., Scheidt,E. W., Gribanov,A., ...

Exotic Superconductivity in the Coexistent Phase of Antiferromagnetism and Superconductivity in CeCu2(Si0.98Ge0.02)2: A Cu-NQR Study under Hydrostatic Pressure (2004)

Kawasaki, Y., Ishida, K. J., Kawasaki, S. J., Mito, T., Kitaoka, Y., ...

Novel superconductivity and magnetism in CePt3Si (2004)

Bauer, E., Hilscher, G., Michor, H., Sieberer, M., Scheidt, E. W., Gribanov, A., ...

Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu2(Si0.98Ge0.02)2: A Cu-NQR study under hydrostatic pressure (2003)

Kawasaki, Y., Ishida, K., Kawasaki, S., Mito, T., Kitaoka, Y., ...

We report a pressure ($P$) effect on CeCu$_2$(Si$_{0.98}$Ge$_{0.02}$)$_2$ where an antiferromagnetic (AFM) order at $T_N \sim$ 0.75 K coexists with superconductivity below $T_c \sim$ 0.4 K\@. At...

Low-temperature magnetic order and spin dynamics in YbRh2Si2 (2003)

Ishida,K., MacLaughlin,D. E., Young,B. L., Okamoto,K., Kawasaki,Y., Kitaoka,Y., ...

Anisotropic spin fluctuations in heavy-fermion superconductor CeCoIn5: In-NQR and Co-NMR studies (2003)

Kawasaki, Y., Kawasaki, S., Yashima, M., Mito, T., Kitaoka, Y., ...

We report In-NQR and Co-NMR experiments of CeCoIn$_5$ that undergoes a superconducting transition with a record high $T_{\rm c}$ = 2.3 K to date among heavy-fermion superconductors. At zero magnetic...

Quantum criticality in YbRh2Si2 (2003)

Custers,J., Gegenwart,P., Neumaier,K., Wilhelm,H., Oeschler,N., Ishida,K., ...

Unconventional Superconductivity and Electron Correlations in Cobalt Oxyhydrate Na$_{0.35}$CoO$_{2}$$\cdot y$H$_{2}$O (2003)

Fujimoto, T., Kitaoka, Y., Meng, R. L., Cmaidalka, J., Chu, C. W.

We report a precise $^{59}$Co nuclear quadrupolar resonance (NQR) measurement on the recently discovered cobalt oxyhydrate Na$_{0.35}$CoO$_{2}$$\cdot y$H$_{2}$O superconductor from $T$=40 K down to...

Coexistence or Separation of the Superconducting, Antiferromagnetic, and Paramagnetic Phases in Quasi One-Dimensional (TMTSF)2PF6 ? (2003)

Kornilov, A. V., Pudalov, V. M., Kitaoka, Y., Ishida, K., Mito, T., ...

We report on experimental studies of the character of phase transitions in the quasi-1D organic compound (TMTSF)2PF6 in the close vicinity of the borders between the paramagnetic metal PM,...

μSR and low-temperature antiferromagnetism in the ordered non-Fermi-liquid compound YbRh2Si2 (2003)

Ishida,K., MacLaughlin,D. E., Okamoto,K., Kawasaki,Y., Kitaoka,Y., Nieuwenhuys,G. J., ...

Al Knight-shift measurement in the superconducting state of UNi2Al3 (2003)

Ishida,K., Tou,H., Tateiwa,N., Kitaoka,Y., Sato,K. N., Aso,N., ...

Sb-NQR probe for superconducting property in the Pr-based filled skutterudite compound PrRu4Sb12 (2003)

Yogi, M., Kotegawa, H., Imamura, Y., Kitaoka, Y., Sugawara, H., ...

We report the electronic and superconducting properties in the Pr-based filled-skutterudite superconductor PrRu$_4$Sb$_{12}$ with $T_c = 1.3$ K via the measurements of nuclear-quadrupole-resonance...

Gapless Magnetic and Quasiparticle Excitations due to the Coexistence of Antiferromagnetism and Superconductivity in CeRhIn$_5$ : A study of $^{115}$In-NQR under Pressure (2003)

Kawasaki, S., Mito, T., Kawasaki, Y., Kitaoka, Y., Aoki, D., ...

We report systematic measurements of ac-susceptibility, nuclear-quadrupole-resonance spectrum, and nuclear-spin-lattice-relaxation time ($T_1$) on the pressure ($P$)- induced heavy-fermion (HF)...

63Cu-NMR study of single-layer high-Tc cuprate Bi2.1Sr1.9CuO6 (2003)

Sakai, A., Zheng, G. Q., Kitaoka, Y., Liang, B., Lin, C. T.

Quantum criticality in YbRh2Si2 (2003)

Custers, J., Gegenwart, P., Neumaier, K., Wilhelm, H., Oeschler, N., Ishida, K., ...

μSR and low-temperature antiferromagnetism in the ordered non-Fermi-liquid compound YbRh2Si2 (2003)

Ishida, K., MacLaughlin, D. E., Okamoto, K., Kawasaki, Y., Kitaoka, Y., Nieuwenhuys, G. J., ...

Low-temperature magnetic order and spin dynamics in YbRh2Si2 (2003)

Ishida, K., MacLaughlin, D. E., Young, B. L., Okamoto, K., Kawasaki, Y., Kitaoka, Y., ...

Al Knight-shift measurement in the superconducting state of UNi2Al3 (2003)

Ishida, K., Tou, H., Tateiwa, N., Kitaoka, Y., Sato, K. N., Aso, N., ...

Exotic magnetism and superconductivity in Ge-substituted CeCu2Si2: A Cu NQR study (2002)

Kawasaki,Y., Ishida,K., Obinata,K., Tabuchi,K., Kashima,K., Kitaoka,Y., ...

We report Cu NQR results on Ge-doped heavy-fermion superconductors CeCu2(Si1-xGex)(2) (0< x≦0.2) and compare with previous results on Ce0.99Cu2.02Si2 (x=0). Once only 1% Ge is substituted for Si to...

Coexistence of Antiferromagnetism and Superconductivity near the Quantum Criticality in Heavy Fermion Compound CeRhIn$_5$ (2002)

Mito, T., Kawasaki, S., Kawasaki, Y., Kitaoka, Y., Aoki, D., ...

We report a study on the interplay between antiferromagnetism (AFM) and superconductivity (SC) in a heavy-fermion compound CeRhIn$_5$ under pressure $P=1.75$ GPa. The onset of the magnetic order is...

Fermi-liquid ground state in n-type copper-oxide superconductor Pr0.91Ce0.09LaCuO4-y (2002)

Sato, T., Kitaoka, Y., Fujita, M., Yamada, K.

We report nuclear magnetic resonance studies on the low-doped n-type copper-oxide Pr_{0.91}LaCe_{0.09}CuO_{4-y} (T_c=24 K) in the superconducting state and in the normal state uncovered by the...

Evidence for Unconventional Strong-coupling Superconductivity in PrOs_4Sb_12 : An Sb Nuclear Quadrupole Resonance (NQR) Study (2002)

Kotegawa, H., Yogi, M., Imamura, Y., Kawasaki, Y., Kitaoka, Y., ...

We report Sb-NQR results which evidence a heavy-fermion (HF) behavior and an unconventional superconducting (SC) property in the filled-skutterudite compound PrOs_4Sb_12 revealing a SC transition...

YbRh2Si2: Spin Fluctuations in the Vicinity of a Quantum Critical Point at Low Magnetic Field (2002)

Ishida,K., Okamoto,K., Kawasaki,Y., Kitaoka,Y., Trovarelli,O., Geibel,C., ...

We report a Si-29 NMR study on aligned single crystals of YbRh2Si2 which shows behavior characteristic of a quantum critical point (QCP: T-N-->0). The Knight shift K and the nuclear spin-lattice...

^{115}In-NQR evidence for unconventional superconductivity in CeIn_3 under pressure (2002)

Kawasaki, S., Mito, T., Kawasaki, Y., Kitaoka, Y., Shishido, H., ...

We report evidence for unconventional superconductivity in CeIn_3 at a pressure P = 2.65 GPa above critical pressure (P_c ~ 2.5 GPa) revealed by the measurements of nuclear-spin-lattice-relaxation...

Spin-Triplet Superconductivity in UNi2Al3 Revealed by the 27Al Knightshift Measurement (2002)

Ishida,K., Ozaki,D., Kamatsuka,T., Tou,H., Kyogaku,M., Kitaoka,Y., ...

We report Al-27 Knight shift (K-27) measurement on a single- crystal UNi2Al3 that reveals a coexistence of superconductivity and a spin-density-wave (SDW) type of magnetic ordering (T- SDW=4.5 K )....

Coexistence of antiferromagnetism and superconductivity in heavy-fermion systems (2002)

Kitaoka,Y., Kawasaki,Y., Mito,T., Kawasaki,S., Zheng,G. Q., Ishida,K., ...

We report the novel pressure (P)-temperature (T) phase diagrams of antiferromagnetism (AFM) and superconductivity (SC) in CeRhIn5, CeIn3, and CeCu2Si2 revealed by the nuclear quadrupole resonance...

Evidence for the Coexistence of Superconductivity and the Magnetic A-Phase in CeCu2Si2 proved by Muon Knight Shift (2002)

Koda,A., Higemoto,W., Kadono,R., Kawasaki,Y., Ishida,K., Kitaoka,Y., ...

Muon spin rotation measurements under high transverse fields (HTF-ASR) have been performed on polycrystalline samples of Ce0.99Cu2.02Si2. The muon hyperfine coupling constant was determined to be...

Cu-NQR study of CeCu2(Si0.98Ge0.02)2 under hydrostatic pressure (2002)

Kawasaki,Y., Ishida,K., Obinata,K., Mito,T., Zheng,G. Q., Kitaoka,Y., ...

We report a pressure effect on CeCu2(Si0.98Ge0.02)(2) where an anti ferromagnetic order below T-N similar to 0.75 K coexists with superconductivity below T-c similar to0.4 K. At pressures exceeding...

Evidence for High-frequency Phonon Mediated S-wave Superconductivity : 11B-NMR Study of Al-doped MgB2 (2002)

Kotegawa, H., Ishida, K., Kitaoka, Y., Muranaka, T., Nakagawa, N., Takagiwa, H., ...

We report $^{11}$B-NMR study on Al-doped MgB$_2$ that addresses a possible mechanism for a high superconducting (SC) transition temperature ($T_c$) of $\sim 40$ K in recently discovered MgB$_2$. The...

Coexistence of antiferromagnetism and superconductivity in heavy-fermions systems (2002)

Kitaoka, Y., Kawasaki, Y., Mito, T., Kawasaki, S., Ishida, K., ...

We report the novel pressure(P)-temperature(T) phase diagrams of antiferromagnetism (AF) and superconductivity (SC) in CeRhIn$_5$, CeIn$_3$ and CeCu$_2$Si$_2$ revealed by the NQR measurement. In the...

YbRh2Si2: Spin Fluctuations in the Vicinity of a Quantum Critical Point at Low Magnetic Field (2002)

Ishida, K., Okamoto, K., Kawasaki, Y., Kitaoka, Y., Trovarelli, O., Geibel, C., ...

We report a Si-29 NMR study on aligned single crystals of YbRh2Si2 which shows behavior characteristic of a quantum critical point (QCP: T-N-->0). The Knight shift K and the nuclear spin-lattice...

Spin-Triplet Superconductivity in UNi2Al3 Revealed by the 27Al Knightshift Measurement (2002)

Ishida, K., Ozaki, D., Kamatsuka, T., Tou, H., Kyogaku, M., Kitaoka, Y., ...

We report Al-27 Knight shift (K-27) measurement on a single- crystal UNi2Al3 that reveals a coexistence of superconductivity and a spin-density-wave (SDW) type of magnetic ordering (T- SDW=4.5 K )....

Cu-NQR study of CeCu2(Si0.98Ge0.02)2 under hydrostatic pressure (2002)

Kawasaki, Y., Ishida, K., Obinata, K., Mito, T., Zheng, G. Q., <