## Refereed papers in 1991

[94] |
"Electronic structure studies on the n-type doped superconductors R_{2-x}M_{x}CuO_{4-d} (R=Pr,Nd,Sm; M=Ce,Th) and Nd_{2}CuO_{4-x}F_{x} by electron-energy-loss spectroscopy"
M. Alexander, H. Romberg, N. Nucker, P. Adelmann, J. Fink, J. T. Markert, M. B. Maple, S. Uchida, H. Takagi, Y. Tokura, A. James, and D. W. Murphy Phys. Rev. B , 43, 333 (1991) . |

[93] |
"^{63,65}Cu-NMR Study of Oxidized and Reduced Nd_{2-x}Ce_{x}CuO_{4}"
S. Kambe, H. Yasuoka, H. Takagi, S. Uchida, and Y. Tokura J. Phys. Soc. Jpn., 60, 400 (1991) . |

[92] |
"Electronic structures and their anisotropy of polysilanes as investigated by synchrotron radiation spectroscopy"
H. Tachibana, Y. Kawabata, S. Koshihara, T. Arima, Y. Moritomo and Y. Tokura, Phys. Rev. B, 44, 5487 (1991) . |

[91] |
"Inverse peierls transition induced by photoexcitation in potassium-tetracyanoquindimethan (K-TCNQ)"
S. Koshihara, Y. Tokura, Y. Iwasa and T. Koda, Phys. Rev. B, 44, 431 (1991) . |

[90] |
"Anomalous dielectric response in tetrathiafulvalene-p-chloranil as observed in temperature-and pressure-induced neutral- to-ionic phase transition"
H. Okamoto, T. Mitani, Y. Tokura, S. Koshihara, T. Komatsu, Y. Iwasa and T. Koda, Phys. Rev. B, 43, 8224 (1991) . |

[89] |
"Excited states of one-dinmensional excitons in polysilanes as investigated by two-photon spectoroscopy"
Y. Moritomo, Y. Tokura, H. Tachibana, Y. Kawabata, and R. D. Miller, Phys. Rev. B, 43, 14746 (1991) . |

[88] |
"Dielectric phase transition and change of constituent molecules in proton-deuteron mixed crystals of squaric acid"
Y. Moritomo, T. Katuhuji and Y. Tokura, J. Chem. Phys., 95, 2244 (1991) . |

[87] |
"Quantum paraelectricity and subsequent disappearance of bond alternation of molecule caused by proton dynamics in squaric acid crystal"
Y. Moritomo, Y. Tokura, H. Takahashi and N. Mori, Phys. Rev. Lett., 67, 2041 (1991) . |

[86] |
"Soft x-ray absorption studies of the location of extra charges induced by substitution in controlled-valence materials"
M. Abbate, F. M. F. de Groot, J. C. Fuggle, A. Fujimori, Y. Tokura, Y. Fujishima, O. Strebel, G. Kaindl, J. Van Elp, B. t. Thole, G. A. Sawatzky, M. Sacchi and N. Tsuda, Phys. Rev. B, 44, 5419 (1991) . |

[85] |
"Optical excitations in CuO_{2} sheets and their strong dependence on Cu-O coordination and bond length"
T. Arima, K. Kikuchi, M. Kasuya, S. Koshihara, Y. Tokura, T. Ido and S. Uchida, Phys. Rev. B, 44, 917 (1991) . |

[84] |
"Optical spectra of La_{2-x}Sr_{x}CuO_{4}: effect of carrier doping on the electronic structure of the CuO_{2} plane"
S. Uchida, T. Ido, H. Takagi, T. Arima, Y. Tokura and S. Tajima, Phys. Rev. B, 43, 7942 (1991) . |