## Refereed papers in 1999

[289] |
"Resonant Photoemission Study of LaTiO_{3.04}"
M. Nakamura, T. Yoshida, K. Mamiya, A. Fujimori, Y. Taguchi, and Y. Tokura Materials Science and Engineering B, 68, 123 (1999) . |

[288] |
"Photoinduced Cooperative Charge Transfer in Low-Dimensional Organic Crystals"
S. Koshihara, Y. Takahashi, H. Sakai, Y. Tokura, and T. Luty Journal of Physical Chemistry B , 103, 2592 (1999) . |

[287] |
"Colossal Magnetoresistive Manganites"
Y. Tokura and Y. Tomioka J. Magn. Magn. Mater., 200, 1 (1999) . |

[286] |
"Persistent X-Ray Photoconductivity and Percolation of Metallic Clusters in Charge-Ordered Manganites"
D. Casa, V. Kiryukhin, O. A. Saleh, B. Keimer, J. P. Hill, Y. Tomioka, and Y. Tokura Europhys. Lett., 47, 90 (1999) . |

[285] |
"Switching Behavior of Epitaxial Perovskite Manganite Thin Films"
H. Oshima, K. Miyano, Y. Konishi, M. Kawasaki, and Y. Tokura Appl. Phys. Lett., 75, 1473 (1999) . |

[284] |
"Current-induced low-resistive state in organic Mott insulator ET-TCNQ"
R. Kumai, and Y. Tokura, Chem. Lett., 28, 765 (1999) . |

[283] |
"Order-disorder transiton of nonplanar molecules and dielectric anomaly in a crystal of charge-transfer complex"
S. Horiuchi, R. Kumai, Y. Okimoto, and Y. Tokura, J. Am. Chem. Soc., 121, 6757 (1999) . |

[282] |
"Spontaneous bubble domain formation in a layered ferromagnetic crystal"
T. Fukumura, H. Sugawara, T. Hasegawa, K. Tanaka, H. Sakaki, T. Kimura, and Y. Tokura, Science, 284, 1969 (1999) . |

[281] |
"Diffuse phase transition and phase separation in Cr-doped Nd_{1/2}Ca_{1/2}MnO_{3}: a relaxor ferromagnet"
T. Kimura, Y. Tomioka, R. Kumai, Y. Okimoto, and Y. Tokura, Phys. Rev. Lett., 83, 3940-3943 (1999) . |

[280] |
"Magnetotransport phenomena in a metallic ferromagnet on the verge of Mott transition: Sm_{2}Mo_{2}O_{7}"
Y. Taguchi, and Y. Tokura, Phys. Rev. B, 60, 10280-10283 (1999) . |

[279] |
"Hole concentration induced transformation of the magnetic and orbital structure in Nd_{1-x}Sr_{x}MnO_{3}"
R. Kajimoto, H. Yoshizawa, H. Kawano, H. Kuwahara, Y. Tokura, K. Ohoyama, and M. Ohashi, Phys. Rev. B, 60, 9506-9517 (1999) . |

[278] |
"Coherent-incoherent crossover of charge dynamics in the ferromagnetic ground state of manganites: R_{0.6}Sr_{0.4}MnO_{3} (R=La-Sm)"
E. Saitoh, Y. Okimoto, Y. Tomioka, T. Katsufuji, and Y. Tokura, Phys. Rev. B, 60, 10362-10366 (1999) . |

[277] |
"Orbital-state-mediated phase-control of manganites"
Y. Konishi, Z. Fang, M. Izumi, T. Manako, M. Kasai, H. Kuwahara, M. Kawasaki, K. Terakura, and Y. Tokura, J. Phys. Soc. Jpn., 68, 3790-3793 (1999) . |

[276] |
"Variation of charge-ordering transitions in R_{1/3}Sr_{2/3}FeO_{3} (R=La, Pr, Nd, Sm, and Gd)"
S. K. Park, T. Ishikawa, and Y. Tokura, Phys. Rev. B, 60, 10788-10795 (1999) . |

[275] |
"Probing charge/orbital correlation in La_{1.2}Sr_{1.8}Mn_{2}O_{7} by Raman spectroscopy"
K. Yamamoto, T. Kimura, T. Ishikawa, T. Katsufuji, and Y. Tokura, J. Phys. Soc. Jpn., 68, 2538-2541 (1999) . |

[274] |
"Low-temperature transport properties in a bilayered manganite La_{1.3}Sr_{1.7}Mn_{2}O_{7}"
T. Okuda, T. Kimura, and Y. Tokura, Phys. Rev. B, 60, 3370-3374 (1999) . |

[273] |
"Frequency and temperature dependence of conductivity for perovskite titanates"
T. Katsufuji, and Y. Tokura, Phys. Rev. B, 60, 7673-7676 (1999) . |

[272] |
"Structure characterization and magnetic properties of oxide superlattices La_{0.6}Sr_{0.4}MnO_{3}/La_{0.6}Sr_{0.4}FeO_{3}"
M. Izumi, Y. Murakami, Y. Konishi, T. Manako, M. Kawasaki, and Y. Tokura, Phys. Rev. B, 60, 1211-1215 (1999) . |

[271] |
"High field magnetizaiton process in R_{1/2}Ca_{1/2}MnO_{3} (R=Sm and Y) up to 100T"
M. Tokunaga, N. Miura, Y. Tomioka, and Y. Tokura, Phys. Rev. B, 60, 6219-6222 (1999) . |

[270] |
"Effect of magnetic transitions and charge-ordering on crystal lattice in Nd_{0.5}Sr_{0.5}MnO_{3}"
S. Shimomura, K. Tajima, N. Wakabayashi, H. Kuwahara, and Y. Tokura, J. Phys. Soc. Jpn., 68, 1943-1947 (1999) . |

[269] |
"Action spectra of the two-stage photo-induced insulator-metal transition in Pr_{1-x}Ca_{x}MnO_{3}"
M. Fiebig, K. Miyano, T. Saitoh, Y. Tomioka, and Y. Tokura, Phys. Rev. B, 60, 7944-7949 (1999) . |

[268] |
"Commensurability effect on the charge ordering of La_{2-x}Sr_{x}NiO_{4}"
T. Katsufuji, T. Tanabe, T. Ishikawa, S. Yamanouchi, Y. Tokura, T. Kakeshita, R. Kajimoto, and H. Yoshizawa, Phys. Rev. B, 60, R5097 (1999) . |

[267] |
"Current-induced insulator-metal transition and pattern formation in an organic charge-transfer complex"
R. Kumai, Y. Okimoto, and Y. Tokura, Science, 284, 1645-1647 (1999) . |

[266] |
"Effect of chemical doping on the ferroelectric neutral-ionic phase transition in tetrathiafulvalene-p-chloranil (TTF-QCl4)"
S. Horiuchi, R. Kumai, Y. Okimoto, and Y. Tokura, Phys. Rev. B, 59, 11267-11275 (1999) . |

[265] |
"Photoinduced phase transformation in polythiophene"
N. Hosaka, H. Tachibana, N. Shiga, M. Matsumoto, and Y. Tokura, Phys. Rev. Lett., 82, 1672-1675 (1999) . |

[264] |
"Intergrain tunneling magnetoresistance in polycrystals of the ordered double perovskite Sr_{2}FeReO_{6}"
K. -I. Kobayashi, T. Kimura, Y. Tomioka, H. Sawada, K. Terakkura, and Y. Tokura, Phys. Rev. B, 59, 11159-11162 (1999) . |

[263] |
"Anomalous pseudogap formation in a nonsuperconducting crystal of Nd_{1.85}Ce_{0.15}CuO_{4+y}: Implication of charge ordering"
Y. Onose, Y. Taguchi, T. Ishikawa, S. Shinomori, K. Ishizaka, and Y. Tokura, Phys. Rev. Lett., 82, 5120-5123 (1999) . |

[262] |
"Electronic correlations on the verge of the Mott transition in La_{1-x}Sr_{x}TiO_{3} by 47/49Ti and 139La nuclear magnetic resonance"
Y. Furukawa, I. Okamura, K. Kumagai, T. Goto, T. Fukase, Y. Taguchi, and Y. Tokura, Phys. Rev. B, 59, 10550-10558 (1999) . |

[261] |
"Symmetry analysis of the fermi surface states of Sr_{2}RuO_{4} by display-type photoelectron spectrosopy"
T. Okuda, M. Kotsugi, K. Nakatsuji, M. Fujikawa, S. Suga, Y. Tezuka, S. Shin, M. Kasai, Y. Tokura, and H. Daimon, J. Phys. Soc. Jpn., 68, 1398-1403 (1999) . |

[260] |
"High-field magnetization and magnetoresistance of La_{0.5}Sr_{1.5}MnO_{4}"
M. Tokunaga, N. Miura, Y. Moritomo, and Y. Tokura, Phys. Rev. B, 59, 11151-11154 (1999) . |

[259] |
"Epitaxial thin films of ordered double perovskite Sr_{2}FeMoO_{6}"
T. Manako, M. Izumi, Y. Konishi, K. -I. Kobayashi, M, Kawasaki, and Y. Tokura, Appl. Phys. Lett., 74, 2215-2217 (1999) . |

[258] |
"Optical response to orbital and charge ordering in a layered manganite: La_{1/2}Sr_{3/2}MnO_{4}"
T. Ishikawa, K. Ookura, and Y. Tokura, Phys. Rev. B, 59, 8367-8370 (1999) . |

[257] |
"Two-dimensional charge-transport and spin-valve effect in layered antiferromagnet Nd_{0.45}Sr_{0.55}MnO_{3}"
H. Kuwahara, T. Okuda, Y. Tomioka, A. Asamitsu, and Y. Tokura, Phys. Rev. Lett., 82, 4316 (1999) . |

[256] |
"Microscopically homogeneous magnetic structure of La_{1-x}Sr_{x}MnO_{3} beyond the range of 0Phys. Rev. B, 59, 97-99 (1999) . |

[255] |
"Optical study of Pr_{1-x}Ca_{x}MnO_{3} (x=0.4) in a magnetic field: Variation of electronic structure with charge ordering and disordering phase transitions"
Y. Okimoto, Y. Tomioka, Y. Onose, Y. Otsuka, and Y. Tokura, Phys. Rev. B, 59, 7401-7408 (1999) . |

[254] |
"Critical behavior in LaTiO_{3+\delta/2} in the vicinity of antiferromagnetic instability"
Y. Taguchi, T. Okuda, M. Ohashi, C. Murayama, N. Mori, Y. Iye, and Y. Tokura, Phys. Rev. B, 59, 7917-7924 (1999) . |

[253] |
"Reflection spectroscopy on the photoinduced local metallic phase of Pr_{0.7}Ca_{0.3}MnO_{3}"
M. Fiebig, K. Miyano, Y. Tomioka, and Y. Tokura, Appl. Phys. Lett., 74, 2310-2312 (1999) . |

[252] |
"Ionic-to-neutral phase transformation induced by photoexcitation of the charge-transfer band in tetrathiafulvalene-p-chloranil crystals"
T. Suzuki, T. Sakamaki, K. Tanimura, S. Koshihara, and Y. Tokura, Phys. Rev. B, 60, 6191-6193 (1999) . |

[251] |
"Crystal-field splitting and the on-site Coulomb energy of La_{x}Sr_{1-x}TiO_{3} from resonant soft-x-ray emission spectroscopy"
T. Higuchi, T. Tsukamoto, M. Watanabe, M. M. Grush, T. A. Callcott, R. C. Perera, D. L. Ederer, Y. Tokura, Y. Harada, Y. Tezuka, and S. Shin, Phys. Rev. B, 60, 7711-7714 (1999) . |

[250] |
"Electronic states of charge-ordering Nd_{0.5}Sr_{0.5}MnO_{3} probed by photoemission"
A. Sekiyama, S. Suga, M. Fujikawa, S. Imada, T. Iwasaki, K. Matsuda, T. Matsushita, K. V. Kaznacheyev, A. Fujimori, H. Kuwahara, and Y. Tokura, Phys. Rev. B, 59, 15528-15532 (1999) . |

[249] |
"X-ray diffuse scattering due to polarons in a colossal magnetoresistive manganaite"
S. Shimomura, N. Wakabayashi, H. Kuwahara, and Y. Tokura, Phys. Rev. Lett., 83, 4389-4392 (1999) . |

[248] |
"Transport and magnetic properties of a ferromagnetic metal: Eu_{1-x}La_{x}TiO_{3}"
T. Katsufuji and Y. Tokura, Phys. Rev. B, 60, R15021-R15023 (1999) . |

[247] |
"Interplay between charge, orbital, and magnetic order in Pr_{1-x}Ca_{x}MnO_{3}"
M. v. Zimmermann, J. P. Hill, D. Gibbs, M. Blume, D. Casa, B. Keimer, Y. Murakami, Y. Tomioka, and Y. Tokura, Phys. Rev. Lett., 83, 4872-4875 (1999) . |

[246] |
"Dielectric breakdown of the insulating charge-ordered state in La_{2-x}Sr_{x}NiO_{4}"
S. Yamanouchi, Y. Taguchi, and Y. Tokura, Phys. Rev. Lett., 83, 5555-5558 (1999) . |