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Title: Interplay between superconductivity and itinerant magnetism in underdoped Ba 1–xK xFe 2As 2 (x = 0.2) probed by the response to controlled point-like disorder

Abstract

The response of superconductors to controlled introduction of point-like disorder is an important tool to probe their microscopic electronic collective behavior. In the case of iron-based superconductors, magnetic fluctuations presumably play an important role in inducing high-temperature superconductivity. In some cases, these two seemingly incompatible orders coexist microscopically. Therefore, understanding how this unique coexistence state is affected by disorder can provide important information about the microscopic mechanisms involved. In one of the most studied pnictide family, hole-doped Ba 1–xK xFe 2As 2 (BaK122), this coexistence occurs over a wide range of doping levels, 0.16 ≲ x ≲ 0.25. We used relativistic 2.5 MeV electrons to induce vacancy-interstitial (Frenkel) pairs that act as efficient point-like scattering centers. Upon increasing dose of irradiation, the superconducting transition temperature Tc decreases dramatically. In the absence of nodes in the order parameter this provides a strong support for a sign-changing s± pairing. Simultaneously, in the normal state, there is a strong violation of the Matthiessen’s rule and a decrease (surprisingly, at the same rate as T c) of the magnetic transition temperature Tsm, which indicates the itinerant nature of the long-range magnetic order. Comparison of the hole-doped BaK122 with electron-doped Ba(Fe xCo 1–x) 2As 2more » (FeCo122) with similar T sm ~ 110 K, x = 0.02, reveals significant differences in the normal states, with no apparent Matthiessen’s rule violation above T sm on the electron-doped side. We interpret these results in terms of the distinct impact of impurity scattering on the competing itinerant antiferromagnetic and s± superconducting orders.« less

Authors:
ORCiD logo [1];  [2];  [1];  [3];  [4];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Institut Polytechnique de Paris, Palaiseau (France)
  3. Nanjing Univ., Nanjing (China)
  4. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1545357
Report Number(s):
IS-J-9952
Journal ID: ISSN 2397-4648
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
npj Quantum Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Prozorov, Ruslan, Kończykowski, Marcin, Tanatar, Makariy A., Wen, Hai -Hu, Fernandes, Rafael M., and Canfield, Paul C. Interplay between superconductivity and itinerant magnetism in underdoped Ba1–xKxFe2As2 (x = 0.2) probed by the response to controlled point-like disorder. United States: N. p., 2019. Web. doi:10.1038/s41535-019-0171-2.
Prozorov, Ruslan, Kończykowski, Marcin, Tanatar, Makariy A., Wen, Hai -Hu, Fernandes, Rafael M., & Canfield, Paul C. Interplay between superconductivity and itinerant magnetism in underdoped Ba1–xKxFe2As2 (x = 0.2) probed by the response to controlled point-like disorder. United States. doi:10.1038/s41535-019-0171-2.
Prozorov, Ruslan, Kończykowski, Marcin, Tanatar, Makariy A., Wen, Hai -Hu, Fernandes, Rafael M., and Canfield, Paul C. Thu . "Interplay between superconductivity and itinerant magnetism in underdoped Ba1–xKxFe2As2 (x = 0.2) probed by the response to controlled point-like disorder". United States. doi:10.1038/s41535-019-0171-2. https://www.osti.gov/servlets/purl/1545357.
@article{osti_1545357,
title = {Interplay between superconductivity and itinerant magnetism in underdoped Ba1–xKxFe2As2 (x = 0.2) probed by the response to controlled point-like disorder},
author = {Prozorov, Ruslan and Kończykowski, Marcin and Tanatar, Makariy A. and Wen, Hai -Hu and Fernandes, Rafael M. and Canfield, Paul C.},
abstractNote = {The response of superconductors to controlled introduction of point-like disorder is an important tool to probe their microscopic electronic collective behavior. In the case of iron-based superconductors, magnetic fluctuations presumably play an important role in inducing high-temperature superconductivity. In some cases, these two seemingly incompatible orders coexist microscopically. Therefore, understanding how this unique coexistence state is affected by disorder can provide important information about the microscopic mechanisms involved. In one of the most studied pnictide family, hole-doped Ba1–xKxFe2As2 (BaK122), this coexistence occurs over a wide range of doping levels, 0.16 ≲ x ≲ 0.25. We used relativistic 2.5 MeV electrons to induce vacancy-interstitial (Frenkel) pairs that act as efficient point-like scattering centers. Upon increasing dose of irradiation, the superconducting transition temperature Tc decreases dramatically. In the absence of nodes in the order parameter this provides a strong support for a sign-changing s± pairing. Simultaneously, in the normal state, there is a strong violation of the Matthiessen’s rule and a decrease (surprisingly, at the same rate as Tc) of the magnetic transition temperature Tsm, which indicates the itinerant nature of the long-range magnetic order. Comparison of the hole-doped BaK122 with electron-doped Ba(FexCo1–x)2As2 (FeCo122) with similar Tsm ~ 110 K, x = 0.02, reveals significant differences in the normal states, with no apparent Matthiessen’s rule violation above Tsm on the electron-doped side. We interpret these results in terms of the distinct impact of impurity scattering on the competing itinerant antiferromagnetic and s± superconducting orders.},
doi = {10.1038/s41535-019-0171-2},
journal = {npj Quantum Materials},
number = 1,
volume = 4,
place = {United States},
year = {2019},
month = {7}
}

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    journal, October 2008


    Field-dependent transport critical current in single crystals of Ba(Fe 1 − x TM x ) 2 As 2 (TM = Co, Ni) superconductors
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