Pressure induced Ag₂Te polymorphs in conjunction with topological non trivial to metal transition

Journal Article · Mon Aug 01 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4960606· OSTI ID:1332391

Zhu, J. ^[1]; Oganov, A. R. ^[2]; Feng, W. X. ^[3]; Yao, Y. G. ^[3]; Zhang, S. J. ^[1]; Yu, X. H. ^[1]; Zhu, J. L. ^[4]; Yu, R. C. ^[5]; Jin, C. Q. ^[1]; Dai, X. ^[1]; Fang, Z. ^[1]; Zhao, Y. S. ^[6]

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1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
2. State Univ. of New York (SUNY), Stony Brook, NY (United States). Dept. of Geosciences
3. Beijing Inst. of Technology, Beijing (China). Dept. of Physics
4. Univ. of Nevada, Las Vegas, NV (United States). High Pressure Science and Engineering Center
5. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
6. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; south Univ. of Science adn Technology of China, Guangdong (China)

Silver telluride (Ag₂Te) is well known as superionic conductor and topologica insulator with polymorphs. Pressure induced three phase transitions in Ag₂Te hav been reported in previous. Here, we experimentally identified high pressure phas above 13 GPa of Ag₂Te by using high pressure synchrotron x ray diffraction metho in combination with evolutionary crystal structure prediction, showing it crystallize into a monoclinic structure of space group C2/m with lattice parameters a = 6.081Å b = 5.744Å, c = 6.797 Å, β = 105.53°. The electronic properties measurements of Ag₂Te reveal that the topologically non-trivial semiconducting phase I and semimetalli phase II previously predicated by theory transformed into bulk metals fo high pressure phases in consistent with the first principles calculations

• Research Organization: Univ. of Nevada, Las Vegas, NV (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0001982
• OSTI ID: 1332391
• Journal Information: AIP Advances, Vol. 6, Issue 8; ISSN 2158-3226
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY