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Effects of magnetic impurities on upper critical fields in the high-T c superconductor La-doped CaFe2As2

Jung, Soon-Gil; Shin, Soohyeon; Jang, Harim; Mikheenko, Pavlo; Johansen, Tom Henning; Park, Tuson
Journal article; SubmittedVersion
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LaCa122.pdf (1.616Mb)
Year
2017
Permanent link
http://urn.nb.no/URN:NBN:no-66347

CRIStin
1532188

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  • Fysisk institutt [2254]
  • CRIStin høstingsarkiv [15035]
Original version
Superconductors Science and Technology. 2017, 30:085009 (8), 1-8, DOI: http://dx.doi.org/10.1088/1361-6668/aa766c
Abstract
We investigate the effects of magnetic impurities on the upper critical field (μ 0 H c2) in La-doped CaFe2As2 (LaCa122) single crystals. The magnetic field dependency of the superconducting transition temperature (T c) for LaCa122 is rapidly suppressed at low fields up to ~1 kOe despite its large μ 0 H c2(0) value on the order of tens of Tesla, resulting in a large positive curvature of μ 0 H c2(T) near T c. The magnetization hysteresis (M–H) loop at temperatures above T c shows a ferromagnetic-like signal and the M(H) value rapidly increases with increasing magnetic field up to ~1 kOe. Taken together with the linear suppression of T c with the magnetization in the normal state, these results suggest that the large upward curvature of μ 0 H c2(T) near T c in La-doped CaFe2As2 mainly originates from the suppression of superconductivity due to the presence of magnetic impurities.

© 2017 IOP Publishing
 
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