Faculty Profiles - KOBAYASHI, Yoshiaki

Papers - KOBAYASHI, Yoshiaki

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59Co-NMR Knight shift of Aligned Crystal and Polycrystalline Samples of Superconducting Na0.3CoO2.1.3H2O Reviewed

Yoshiaki Kobayashi, Hidekazu Watanabe, Mai Yokoi, Taketo Moyoshi, Yoshihiko Mori and Masatoshi Sato

Journal of the Physical Society of Japan Vol. 74 ( 6 ) page： 1800-1805 2005.6

Co-59-NMR knight shift of aligned crystals and polycrystalline samples of superconducting Na0.3CoO2 center dot 1.3H(2)O

Kobayashi Y, Watanabe H, Yokoi M, Moyoshi T, Mori Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 74 ( 6 ) page： 1800 - 1805 2005.6

ESR studies on quasi one-dimensional spin system TiOBr

Kato C, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 74 ( 1 ) page： 473 - 477 2005.1

Magnetic structure of a spinel system Cu0.3Zn0.7Cr2Se4

Iikubo S, Yasui Y, Kobayashi Y, Ohno Y, Ito M, Soda M, Sato M, Kakurai K

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Vol. 272 page： 473 - 474 2004.5

Impurity effects on the superconducting transition temperature of NazCoO2 center dot yH(2)O

Yokoi M, Watanabe H, Mori Y, Moyoshi T, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 73 ( 5 ) page： 1297 - 1302 2004.5

Ru-NMR studies and specific heat measurements of Bi3Ru3O11 and La4Ru6O19

Tsuchida K, Kato C, Fujita T, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 73 ( 3 ) page： 698 - 702 2004.3

Co-59-NMR knight shift of superconducting NaxCoO2 center dot yH(2)O

Kobayashi Y, Yokoi M, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 72 ( 10 ) page： 2453 - 2455 2003.10

Co-59 NQR study on superconducting NaxCoO2 center dot yH(2)O

Kobayashi Y, Yokoi M, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 72 ( 9 ) page： 2161 - 2164 2003.9

NMR studies of Co-oxides with large thermoelectric performance

Kobayashi Y, Masuda H, Miyashita T, Sato M, Itoh M, Terasaki I

PHYSICA B-CONDENSED MATTER Vol. 329 page： 926 - 927 2003.5

Spin-glass-like transition and Hall resistivity of Y2-xBixIr2O7

Aito N, Soda M, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 72 ( 5 ) page： 1226 - 1230 2003.5

Transport, thermal and magnetic properties of pyrochlore oxides Y2-xBixIr2O7

Soda M, Aito N, Kurahashi Y, Kobayashi Y, Sato M

PHYSICA B-CONDENSED MATTER Vol. 329 page： 1071 - 1073 2003.5

Transport, thermal and magnetic properties of Bi3Os3O11 and Bi3Ru3O11

Fujita T, Tsuchida K, Yasui Y, Kobayashi Y, Sato M

PHYSICA B-CONDENSED MATTER Vol. 329 page： 743 - 744 2003.5

Spin-state change of co atoms of La4Co3O10+delta

Miyashita T, Kobayashi Y, Fukamachi T, Masuda H, Sato M

PHYSICA B-CONDENSED MATTER Vol. 329 page： 740 - 742 2003.5

Transport and magnetic properties of R(1-x)A(x)CoO(3) (R = La, Pr and Nd; A = Ba, Sr and Ca)

Masuda H, Fujita T, Miyashita T, Soda M, Yasui Y, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 72 ( 4 ) page： 873 - 878 2003.4

*59Co-NMR Knight Shift of Superconducting NaxCoO2·yH2O Reviewed

Yoshiaki Kobayashi, Mai Yokoi and Masatoshi Sato

Journal of the Physical Society of Japan Vol. 72 page： 2453-2455 2003

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Layered Co oxide NaxCoO2·yH2O with the superconducting transition temperature Tc=4.5 K has been studied by 59Co-NMR. The Knight shift K estimated from the observed spectra of a powder sample exhibits almost temperature (T)-independent behavior above Tc and decreases with decreasing T below Tc. This result and the existence of the coherence peak in the spin–lattice relaxation rate versus T curve reported by the present authors indicate, naively speaking, that the singlet order parameter with s-wave symmetry is realized in NaxCoO2·yH2O. Differences in the observed behaviors between the spectra of a nonaligned sample and those of an aligned sample embedded in epoxy adhesive by applying an external magnetic field are discussed.

Co-59-NMR studies on La4Co3O10+delta

Miyashita T, Kobayashi Y, Fukamachi T, Masuda H, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 71 ( 12 ) page： 3043 - 3046 2002.12

Magnetic structure and the Hall resistivity of Cu1-xZnxCr2Se4

Iikubo S, Yasui Y, Oda K, Ohno Y, Kobayashi Y, Sato M, Kakurai K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 71 ( 11 ) page： 2792 - 2799 2002.11

Transport and NQR studies of Nd1.6-xCexSr0.4CuO4 with T* structure

Ambai M, Kobayashi Y, Iikubo S, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 71 ( 2 ) page： 538 - 542 2002.2

Unusual anomalous Hall resistivities of CuCr2S4, Cu0.5Zn0.5Cr2Se4 and Cr3Te4

Oda K, Yoshii S, Yasui Y, Ito M, Ido T, Ohno Y, Kobayashi Y, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 70 ( 10 ) page： 2999 - 3005 2001.10

Studies on successive electronic state changes in systems with NiO2 planes-La-139-NMR/NQR-

Fukamachi T, Oda K, Kobayashi Y, Miyashita T, Sato M

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 70 ( 9 ) page： 2757 - 2764 2001.9

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Papers - KOBAYASHI, Yoshiaki