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Lee,, Joo Seop
원자제어 저차원 전자계 연구단
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Direct observation of an incommensurate charge density wave in the BiS2 -based superconductor NdO1-x FxBiS2

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Title
Direct observation of an incommensurate charge density wave in the BiS2 -based superconductor NdO1-x FxBiS2
Author(s)
Jooseop Lee; Nagao, Masanori; Mizuguchi, Yoshikazu; Ruff, Jacob
Publication Date
2021-06
Journal
PHYSICAL REVIEW B, v.103, no.24
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.The nature of superconductivity in BiS2-based superconductors has been controversial while ab initio calculations proposed this system in close proximity to a charge-density-wave (CDW) phase. Using high-energy high-flux x-ray diffraction, we reveal an intrinsic and long-range CDW phase coexisting with superconductivity in NdO1-xFxBiS2 superconductor (x=0.37 and 0.3). The CDW wave vector in NdO0.63F0.37BiS2 correspond QCDW=(0.17, 0.17, 0.5) and is associated with transverse atomic displacements. Interestingly, this wave vector does not match theoretical expectations based on either phonon softening or Fermi surface nesting. In NdO0.7F0.3BiS2, where the superconducting transition temperature is highest, the CDW satellites are slightly broader and weaker compared to NdO0.63F0.37BiS2, possibly suggesting the competition with the superconductivity. Last, we measure a thermal diffuse scattering across the superconducting transition temperature and find no meaningful changes. Our result suggests the importance of understanding CDW which might hold a key to the superconductivity in the BiS2-based superconductor.
URI
https://pr.ibs.re.kr/handle/8788114/9998
DOI
10.1103/PhysRevB.103.245120
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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