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Title: Effect of proton irradiation on superconductivity in optimally doped BaFe2(As1-xPx)2 single crystals

Journal Article · · Physical Review B
 [1];  [1];  [1];  [2];  [1];  [3];  [1];  [1];  [1];  [1];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Northern Illinois, DeKalb, IL (United States)
  3. Western Michigan Univ., Kalamazoo, MI (United States)

Irradiation with 4 MeV protons was used to systematically introduce defects in single crystals of the iron-arsenide superconductor BaFe2(As1-xPx)2, x = 0.33. The effect of disorder on the low-temperature behavior of the London penetration depth λ(T) and transition temperature Tc was investigated. In nearly optimally doped samples with Tc ~ 29 K, signatures of a superconducting gap with nodes were observed. Contrary to previous reports on electron-irradiated crystals, we do not see a disorder-driven lifting of accidental nodes, and we observe that proton-induced defects are weaker pair breakers than electron-induced defects. Lastly, we attribute our findings to anisotropic electron scattering caused by proton irradiation defects.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1279437
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 11 Vol. 93; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Disorder raises the critical temperature of a cuprate superconductor journal May 2019
Clean to dirty limit and T c suppression in NdFeAsO 0.7 F 0.3 studied by H c2 analysis journal February 2018
Using electron irradiation to probe iron-based superconductors journal May 2018
c -axis superconducting performance enhancement in Co-doped Ba122 thin films by an artificial pinning center design journal November 2019
Anisotropic upper critical field of pristine and proton-irradiated single crystals of the magnetically ordered superconductor RbEuFe 4 As 4 journal August 2019
Anomalous sharp peak in the London penetration depth induced by the nodeless-to-nodal superconducting transition in BaFe 2 ( As 1 − x P x ) 2 journal October 2019
Evidence of nodes in the order parameter of the superconducting doped topological insulator Nb x Bi 2 Se 3 via penetration depth measurements journal November 2016
Robust odd-parity superconductivity in the doped topological insulator Nb x Bi 2 Se 3 journal September 2017
Superconductivity, pairing symmetry, and disorder in the doped topological insulator Sn 1 − x In x Te for x ≥ 0.10 journal January 2018
Using electron irradiation to probe iron - based superconductors text January 2018
Disorder raises the critical temperature of a cuprate superconductor text January 2018

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