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Title: Constraint on the potassium content for the superconductivity of potassium-intercalated phenanthrene

Raman-scattering measurements were performed on K{sub x}phenanthrene (0 ⩽ x ⩽ 6.0) at room temperature. Three phases (x = 3.0, 3.5, and 4.0) are identified based on the obtained Raman spectra. Only the K{sub 3}phenanthrene phase is found to exhibit the superconducting transition at 5 K. The C–C stretching modes are observed to broaden and become disordered in K{sub x}phenanthrene with x = 2.0, 2.5, 6.0, indicating some molecular disorder in the metal intercalation process. This disorder is expected to influence the nonmetallic nature of these materials. The absence of metallic character in these nonsuperconducting phases is found from the calculated electronic structures based on the local density approximation.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [3] ;  [2] ;  [1] ;  [6]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203 (China)
  2. (China)
  3. Center for Photovoltaics and Solar Energy, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055 (China)
  4. Department of Physics, South China University of Technology, Guangzhou 510640 (China)
  5. Department of Physics, Yantai University, Yantai 264005 (China)
  6. (United States)
Publication Date:
OSTI Identifier:
22254162
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CLATHRATES; DENSITY; ELECTRONIC STRUCTURE; PHENANTHRENE; POTASSIUM; RAMAN EFFECT; RAMAN SPECTRA; SUPERCONDUCTIVITY