Pressure-induced superconductivity in AgxBi2xSe3

Tong He, Xiaofan Yang, Takahiro Terao, Takaki Uchiyama, Teppei Ueno, Kaya Kobayashi, Jun Akimitsu, Takafumi Miyazaki, Takumi Nishioka, Koji Kimura, Kouichi Hayashi, Naohisa Happo, Hitoshi Yamaoka, Hirofumi Ishii, Yen-Fa Liao, Hiromi Ota, Hidenori Goto, and Yoshihiro Kubozono
Phys. Rev. B 97, 104503 – Published 7 March 2018

Abstract

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.

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  • Received 26 December 2017

DOI:https://doi.org/10.1103/PhysRevB.97.104503

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Tong He1, Xiaofan Yang1, Takahiro Terao1, Takaki Uchiyama1, Teppei Ueno1, Kaya Kobayashi1, Jun Akimitsu1, Takafumi Miyazaki2, Takumi Nishioka3, Koji Kimura3, Kouichi Hayashi3,4, Naohisa Happo5, Hitoshi Yamaoka6, Hirofumi Ishii7, Yen-Fa Liao7, Hiromi Ota8, Hidenori Goto1, and Yoshihiro Kubozono1,*

  • 1Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
  • 2Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan
  • 3Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
  • 4Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya 466-8555, Japan
  • 5Graduate School of Information Science, Hiroshima City University, Hiroshima 731-3194, Japan
  • 6RIKEN SPring-8 Center, Hyogo 679-5148, Japan
  • 7National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
  • 8Advanced Science Research Center, Okayama University, Okayama 700-8530, Japan

  • *Corresponding author: kubozono@cc.okayama-u.ac.jp

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Issue

Vol. 97, Iss. 10 — 1 March 2018

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