Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe Co ) As
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
Irradiation with 1.4 GeV 208 Pb ions was used to induce artificial disorder in single crystals of iron-arsenide superconductor Ba(Fe 1 - x Co x ) 2 As 2 and to study its effects on the temperature-dependent London penetration depth and transport properties. A study was undertaken on overdoped single crystals with x = 0.108 and x = 0.127 characterized by notable modulation of the superconducting gap. Irradiation corresponding to the matching fields of B Φ = 6 T and 6.5 T with doses 2.22 × 10 11 d /cm 2 and 2.4 × 10 11 d /cm 2 , respectively, suppresses the superconducting T c by approximately 0.3 to 1 K. The variation of the low-temperature penetration depth in both pristine and irradiated samples is well described by the power law Δ λ ( T ) = A T n . Irradiation increases the magnitude of the prefactor A and decreases the exponent n , similar to the effect of irradiation in optimally-doped samples. This finding supports universal s ± pairing in Ba(Fe 1 - x Co x ) 2 As 2 compounds for the entire Co doping range.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
- Sponsoring Organization:
- USDOE SC Office of Basic Energy Sciences (SC-22)
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 1385468
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 5 Vol. 88; ISSN 1098-0121; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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