American Physical Society Acta Medica Okayama 01631829 97 10 2018 Pressure-induced superconductivity in AgxBi2-xSe3 104503 EN Tong He Research Institute for Interdisciplinary Science, Okayama University Xiaofan Yang Research Institute for Interdisciplinary Science, Okayama University Takahiro Terao Research Institute for Interdisciplinary Science, Okayama University Takaki Uchiyama Research Institute for Interdisciplinary Science, Okayama University Teppei Ueno Research Institute for Interdisciplinary Science, Okayama University Kaya Kobayashi Research Institute for Interdisciplinary Science, Okayama University Jun Akimitsu Research Institute for Interdisciplinary Science, Okayama University Takafumi Miyazaki Research Laboratory for Surface Science, Okayama University Takumi Nishioka Department of Physical Science and Engineering, Nagoya Institute of Technology Koji Kimura Department of Physical Science and Engineering, Nagoya Institute of Technology Kouichi Hayashi Frontier Research Institute for Materials Science, Nagoya Institute of Technology Naohisa Happo Graduate School of Information Science, Hiroshima City University, Hitoshi Yamaoka RIKEN SPring-8 Center Hirofumi Ishii National Synchrotron Radiation Research Center Yen-Fa Liao National Synchrotron Radiation Research Center Hiromi Ota Advanced Science Research Center, Hidenori Goto Research Institute for Interdisciplinary Science, Okayama University Yoshihiro Kubozono Research Institute for Interdisciplinary Science, Okayama University We investigated the pressure dependence of electric transport and crystal structure of Ag-doped Bi2Se3. In the sample prepared by Ag doping of Bi2Se3, the Bi atom was partially replaced by Ag, i.e., Ag0.05Bi1.95Se3. X-ray diffraction patterns of Ag0.05Bi1.95Se3 measured at 0–30 GPa showed three different structural phases, with rhombohedral, monoclinic, and tetragonal structures forming in turn as pressure increased, and structural phase transitions at 8.8 and 24 GPa. Ag0.05Bi1.95Se3 showed no superconductivity down to 2.0 K at 0 GPa, but under pressure, superconductivity suddenly appeared at 11 GPa. The magnetic field (H) dependence of the superconducting transition temperature Tc was measured at 11 and 20.5 GPa, in order to investigate whether the pressure-induced superconducting phase is explained by either p-wave polar model or s-wave model. No potential conflict of interest relevant to this article was reported.