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Title: Doping evolution of the anisotropic upper critical fields in the iron-based superconductor Ba 1-xK xFe 2As 2

In-plane resistivity measurements as a function of temperature and magnetic field up to 35 T with precise orientation within the crystallographic ac plane were used to study the upper critical field H c2 of the hole-doped iron-based superconductor Ba 1–xK xFe 2As 2. Compositions of the samples studied spanned from under- doped x=0.17 (T c=12 K) and x=0.22 (T c=20 K), both in the coexistence range of stripe magnetism and superconductivity, through optimal doping x=0.39 (T c=38.4 K) and x=0.47 (T c=37.2 K), to overdoped x=0.65 (T c=22 K) and x=0.83 (T c=10 K). Here, we find notable doping asymmetry of the shapes of the anisotropic H c2(T), suggesting the important role of paramagnetic limiting effects in the H∥a configuration in overdoped compositions and multiband effects in underdoped compositions.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
Publication Date:
Report Number(s):
IS-J-9508
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1800192
Grant/Contract Number:
AC02-07CH11358; DMR 1157490
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 18; 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:
1411176
Alternate Identifier(s):
OSTI ID: 1408790