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Title: Pressure-induced charge density wave phase in A g 2 - δ Te

Abstract

Considerable excitement was generated by the observation of large and linear positive magnetoresistance in nonmagnetic silver chalcogenides. Renewed interest in these materials was kindled by the discovery that Ag 2Te in particular is a topological insulator with gapless linear Dirac-type surface states. High-pressure x-ray-diffraction studies, combined with first-principles electronic structure calculations, have identified three phase transitions as the pressure is increased: an isostructural transition identified with an electronic topological transition followed by two structural phase transitions. These recent studies were carried out on nominally stoichiometric Ag 2Te. For the present work we have prepared single-phase self-doped Ag 2-δTe samples with a well-characterized silver deficit (δ=2.0×10 -4) for structural and electrical transport measurements over extended ranges of pressure (0–43 GPa), temperature (2–300 K), and magnetic field (0–9 T). The temperature dependence of the resistivity exhibits anomalous behavior at 2.3 GPa, slightly above the isostructural transition, which we postulate is due to Fermi surface reconstruction associated with a charge density wave (CDW) phase. The anomaly is enhanced by the application of a 9-T magnetic field and shifted to higher temperature, implying that the electronic Zeeman energy is sufficient to alter the gapping of the Fermi surface. A peak in the pressure dependencemore » of the resistivity and a sudden drop in the pressure dependence of the mobility, occurring at 2.3 GPa, provide additional evidence for a CDW phase at pressures slightly above the isostructural transition.« less

Authors:
 [1];  [1];  [2];  [3];  [1];  [4];  [5];  [6];  [7]
  1. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
  2. Grand Valley State Univ., Allendale, MI (United States). Physics Dept.
  3. Univ. of Cambridge (United Kingdom). Dept. of Materials Science and Metallurgy
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), X-Ray Science Division
  5. Univ. d'Orléans, Orléans (France). CEMHTI
  6. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China); Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
  7. National Centre for Scientific Research (CNRS), Paris (France); Sorbonne Univ., Paris (France). Inst. de minéralogie, de physique des matériaux et de cosmochimie (IMPMC)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1505175
Alternate Identifier(s):
OSTI ID: 1482283
Grant/Contract Number:  
AC02-06CH11357; NA0001974; FG02-99ER45775
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Zhao, Yongsheng, Yang, Wenge, Schnyders, Harold S., Husmann, Anke, Zhang, Ganghua, Ren, Yang, Price, David L., Mao, Ho-Kwang, and Saboungi, Marie-Louise. Pressure-induced charge density wave phase in Ag2-δTe. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.205126.
Zhao, Yongsheng, Yang, Wenge, Schnyders, Harold S., Husmann, Anke, Zhang, Ganghua, Ren, Yang, Price, David L., Mao, Ho-Kwang, & Saboungi, Marie-Louise. Pressure-induced charge density wave phase in Ag2-δTe. United States. doi:10.1103/PhysRevB.98.205126.
Zhao, Yongsheng, Yang, Wenge, Schnyders, Harold S., Husmann, Anke, Zhang, Ganghua, Ren, Yang, Price, David L., Mao, Ho-Kwang, and Saboungi, Marie-Louise. Thu . "Pressure-induced charge density wave phase in Ag2-δTe". United States. doi:10.1103/PhysRevB.98.205126.
@article{osti_1505175,
title = {Pressure-induced charge density wave phase in Ag2-δTe},
author = {Zhao, Yongsheng and Yang, Wenge and Schnyders, Harold S. and Husmann, Anke and Zhang, Ganghua and Ren, Yang and Price, David L. and Mao, Ho-Kwang and Saboungi, Marie-Louise},
abstractNote = {Considerable excitement was generated by the observation of large and linear positive magnetoresistance in nonmagnetic silver chalcogenides. Renewed interest in these materials was kindled by the discovery that Ag2Te in particular is a topological insulator with gapless linear Dirac-type surface states. High-pressure x-ray-diffraction studies, combined with first-principles electronic structure calculations, have identified three phase transitions as the pressure is increased: an isostructural transition identified with an electronic topological transition followed by two structural phase transitions. These recent studies were carried out on nominally stoichiometric Ag2Te. For the present work we have prepared single-phase self-doped Ag2-δTe samples with a well-characterized silver deficit (δ=2.0×10-4) for structural and electrical transport measurements over extended ranges of pressure (0–43 GPa), temperature (2–300 K), and magnetic field (0–9 T). The temperature dependence of the resistivity exhibits anomalous behavior at 2.3 GPa, slightly above the isostructural transition, which we postulate is due to Fermi surface reconstruction associated with a charge density wave (CDW) phase. The anomaly is enhanced by the application of a 9-T magnetic field and shifted to higher temperature, implying that the electronic Zeeman energy is sufficient to alter the gapping of the Fermi surface. A peak in the pressure dependence of the resistivity and a sudden drop in the pressure dependence of the mobility, occurring at 2.3 GPa, provide additional evidence for a CDW phase at pressures slightly above the isostructural transition.},
doi = {10.1103/PhysRevB.98.205126},
journal = {Physical Review B},
issn = {2469-9950},
number = 20,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
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