Excitation spectrum in Ni- and Cu-doped ZrTe3

Title
Excitation spectrum in Ni- and Cu-doped ZrTe3
Authors
류혜진C. MirriA. DuszaXiangde ZhuHechang LeiL. DegiorgiC. Petrovic
Issue Date
2014-01
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 89-035144-9
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/70295
ISSN
2469-9950
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