@article{c56058d8c8ad4ca2a980b56ea17d43c6,
title = "Softening of Cu-O bond stretching phonons in tetragonal HgBa 2CuO4+δ",
abstract = "The phonon dispersion of Hg1201 was studied using inelastic x-ray scattering. The crystallinity was examined using x-ray diffraction, and four spherically curved analyzer crystals were used on the 10 m horizontal arm to analyze the scattered radiation. Magnetic susceptibility measurement showed a sharp superconductivity transition at 94 K, indicating that the sample was nearly optimally doped. The results show that the shell model described well the dispersion of the low-energy modes, while the Cu-O bond stretching mode at high energy showed strong softening towards the zone boundary, deviating strongly from the model.",
author = "H. Uchiyama and Baron, {A. Q.R.} and S. Tsutsui and Y. Tanaka and Hu, {W. Z.} and A. Yamamoto and S. Tajima and Y. Endoh",
note = "Funding Information: We are grateful to L. Pintschovius for useful suggestions. This work was supported by the New Energy ?>and Industrial Technology Department Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Ap?>plications. The synchrotron radiation experiments were performed at the BL35XU in the SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2002B0287-ND3-np, 2003A0555-ND3-np). H. U. and S. Tsutsui acknowledge financial support by the JSPS.",
year = "2004",
month = may,
day = "14",
doi = "10.1103/PhysRevLett.92.197005",
language = "English",
volume = "92",
pages = "197005--1--197005--4",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "19",
}