Excitation spectrum in Ni- and Cu-doped ZrTe3
- Excitation spectrum in Ni- and Cu-doped ZrTe3
- 류혜진; C. Mirri; A. Dusza; Xiangde Zhu; Hechang Lei; L. Degiorgi; C. Petrovic
- Issue Date
- Physical review B, Condensed matter and materials physics
- VOL 89-035144-9
- ZeTe(3) belongs to the ample class of chainlike chalcogenide charge-density-wave (CDW) materials. Its peculiarity consists in the formation of the CDW condensate at T-CDW along the crystallographic directions perpendicular to the b-axis, Zr-Zr chains. Ni and Cu intercalation of ZrTe3 leads to the onset of bulk superconductivity at T-c < T-CDW, raising questions about the possible coexistence as well as competition between both broken-symmetry ground states. Here, we report on the optical investigation of Ni0.05ZrTe3 and Cu0.05ZrTe3 single crystals performed with electromagnetic radiation polarized along the in-plane crystallographic a and b axes, over a broad spectral range and as a function of temperature. The charge dynamics of the CDW state displays a polarization dependence within the ab plane and gives evidence for a partial gapping of the Fermi surface, which affects almost exclusively the crystallographic direction parallel to the a axis. We provide a complementary analysis of the spectral weight distribution, disentangling its reshuffling in the excitation spectrum across the symmetry-breaking CDW transition. While the superconducting energy gap lies outside our measurable spectral range, we observe nonetheless that the CDW-gap feature persists at T < T-c. We propose that CDW and superconductivity coexist along the a axis.
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