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This content will become publicly available on April 23, 2019

Title: Pressure-tuned superconductivity and normal-state behavior in Ba ( Fe 0.943 Co 0.057 ) 2 As 2 near the antiferromagnetic boundary

Superconductivity in iron pnictides is unconventional and pairing may be mediated by magnetic fluctuations in the Fe sublattice. Pressure is a clean method to explore superconductivity in iron based superconductors by tuning the ground state continuously without introducing disorder. Here we present a systematic high pressure transport study in Ba (Fe 1 - xCo x) 2 As 2 single crystals with x = 0.057, which is near the antiferromagnetic instability. Resistivity ρ = ρ 0 + AT n was studied under applied pressure up to 7.90 GPa. The parameter n approaches a minimum value of n ≈ 1 at a critical pressure P c = 3.65 GPa. Near P c, the superconducting transition temperature T c reaches a maximum value of 25.8 K. In addition, the superconducting diamagnetism at 2 K shows a sudden change around the same critical pressure. Finally, these results may be associated with a possible quantum critical point hidden inside the superconducting dome, near optimum T c.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [7] ;  [7] ;  [8] ;  [3]
  1. Center for High Pressure Science and Technology Advanced Research, Beijing (China); Zhejiang SCI-TECH Univ., Hangzhou (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab. of Functional Materials for Informatics, Shanghai Inst. of Microsystem and Information Technology; Univ. of Chinese Academy of Sciences, Beijing (China).
  3. Center for High Pressure Science and Technology Advanced Research, Beijing (China)
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  5. Nanyang Technological Univ. (Singapore). Division of Physics and Applied Physics, School of Physical and Mathematical Sciences
  6. Zhejiang SCI-TECH Univ., Hangzhou (China)
  7. Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab. of Functional Materials for Informatics, Shanghai Inst. of Microsystem and Information Technology
  8. Kent State Univ., Kent, OH (United States). Dept. of Physics
Publication Date:
Report Number(s):
IS-J-9648
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
11574338; AC02-07CH11358; DMR-1505826; U1530402
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1436424
Alternate Identifier(s):
OSTI ID: 1434348