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Title: Critical magnetic fields of superconducting aluminum-substituted Ba{sub 8}Si{sub 42}Al{sub 4} clathrate

In recent years, efforts have been made to explore the superconductivity of clathrates containing crystalline frameworks of group-IV elements. The superconducting silicon clathrate is unusual in that the structure is dominated by strong sp{sup 3} covalent bonds between silicon atoms, rather than the metallic bonding that is more typical of traditional superconductors. This paper reports on critical magnetic fields of superconducting Al-substituted silicon clathrates, which were investigated by transport, ac susceptibility, and dc magnetization measurements in magnetic fields up to 90 kOe. For the sample Ba{sub 8}Si{sub 42}Al{sub 4}, the critical magnetic fields were measured to be H{sub C1} = 40.2 Oe and H{sub C2} = 66.4 kOe. The London penetration depth of 4360 Å and the coherence length 70 Å were obtained, whereas the estimated Ginzburg–Landau parameter of κ = 62 revealed that Ba{sub 8}Si{sub 42}Al{sub 4} is a strong type-II superconductor.
Authors:
; ; ;  [1] ; ;  [2] ;  [3] ; ;  [4] ; ; ;  [5] ; ;  [6] ;  [7]
  1. School of Engineering, University of Puerto Rico at Mayaguez, Mayaguez, Puerto Rico 00681-9000 (United States)
  2. Department of Physics, University of Puerto Rico, Mayaguez, Puerto Rico 00681 (United States)
  3. Communications Research Centre (CRC), Industry Canada, 3701 Carling Avenue, Box 11490, Station H, Ottawa, Ontario K2H 8S2 (Canada)
  4. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
  5. Department of Physics, University of Science and Technology Beijing, Beijing 100083 (China)
  6. Department of Chemistry and Physics, Fayetteville State University, Fayetteville, North Carolina 28301 (United States)
  7. Department of Mathematics, University of Texas-Pan American, Edinburg, Texas 78541 (United States)
Publication Date:
OSTI Identifier:
22412867
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM SILICIDES; BARIUM COMPOUNDS; CHEMICAL BONDS; COHERENCE LENGTH; CRITICAL FIELD; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; PENETRATION DEPTH; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TYPE-II SUPERCONDUCTORS