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Title: Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe 1 - x Co x ) 2 As 2

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1385468
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 88; Journal Issue: 5; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons, thermal conductivity, energy storage (including batteries and capacitors), superconductivity, defects, spin dynamics

Citation Formats

Murphy, J., Tanatar, M. A., Kim, Hyunsoo, Kwok, W., Welp, U., Graf, D., Brooks, J. S., Bud'ko, S. L., Canfield, P. C., and Prozorov, R. Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe 1-x Co x ) 2 As 2. United States: N. p., 2013. Web. doi:10.1103/PhysRevB.88.054514.
Murphy, J., Tanatar, M. A., Kim, Hyunsoo, Kwok, W., Welp, U., Graf, D., Brooks, J. S., Bud'ko, S. L., Canfield, P. C., & Prozorov, R. Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe 1-x Co x ) 2 As 2. United States. doi:10.1103/PhysRevB.88.054514.
Murphy, J., Tanatar, M. A., Kim, Hyunsoo, Kwok, W., Welp, U., Graf, D., Brooks, J. S., Bud'ko, S. L., Canfield, P. C., and Prozorov, R. Thu . "Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe 1-x Co x ) 2 As 2". United States. doi:10.1103/PhysRevB.88.054514.
@article{osti_1385468,
title = {Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe 1-x Co x ) 2 As 2},
author = {Murphy, J. and Tanatar, M. A. and Kim, Hyunsoo and Kwok, W. and Welp, U. and Graf, D. and Brooks, J. S. and Bud'ko, S. L. and Canfield, P. C. and Prozorov, R.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.88.054514},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 5,
volume = 88,
place = {United States},
year = {2013},
month = {8}
}

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