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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 $\mathrm{A}{\mathrm{g}}_{2}\mathrm{Te}$ 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 $\mathrm{A}{\mathrm{g}}_{2}\mathrm{Te}$. For the present work we have prepared single-phase self-doped $\mathrm{A}{\mathrm{g}}_{2\text{\ensuremath{-}}\ensuremath{\delta}}\mathrm{Te}$ samples with a well-characterized silver deficit ($\ensuremath{\delta}=2.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$) 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.

physical review. b./physical review. b

Pressure-induced charge density wave phase in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">A</mml:mi><mml:msub><mml:mi mathvariant="normal">g</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mtext>−</mml:mtext><mml:mi>δ</mml:mi></mml:mrow></mml:msub><mml:mi>Te</mml:mi></mml:mrow></mml:math>

Pressure-induced charge density wave phase in Ag2−δTe