Quasiparticle scattering in 3 MeV proton irradiated 
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Park, Akiyoshi; Pyon, Sunseng; Sun, Yue; Veshchunov, Ivan S.; Chen, Jingting; Ito, Nobuyoshi; Suwa, Takahiro; Tamegai, T.; Kitamura, Hisashi; Ichinose, Ataru

doi:10.1103/physrevb.98.054512

Cited by 16 publications

(12 citation statements)

References 39 publications

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“…Single crystals of EuFe 2 (As 1−x P x ) 2 were grown by a selfflux method [18,19]. Because of the narrow superconducting dome in the EuFe 2 (As 1−x P x ) 2 phase diagram [6], crystals with slightly different doping-x = 0.20 and 0.23, grown using different precursors (Eu, Fe, P, As and Eu, FeAs, FeP, respectively)-show significantly different critical temperatures, T sc = 24.1 K and 22.3 K, respectively.…”

Section: Methodsmentioning

confidence: 99%

Microwave analysis of the interplay between magnetism and superconductivity in EuFe2(As1−xPx)2
Ghigo
¹
,
Torsello
²
,
Gozzelino
³

et al. 2019
Phys. Rev. Research
24
1
29
0
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We report on the microwave analysis of the interplay between magnetism and superconductivity in single crystals of EuFe 2 (As 1−x P x) 2 , accomplished by means of a coplanar waveguide resonator technique. The bulk complex magnetic susceptibility χ m extracted through a cavity perturbation approach is demonstrated to be highly sensitive to the magnetic structure and dynamics, revealing two distinct magnetic transitions below the superconducting critical temperature. By a comparison with magnetic force microscopy maps, we ascribe the χ m peak observed at about 17 K to the transition from the ferromagnetic domain Meissner phase to the domain vortex-antivortex state, with the subsequent evolution of the domain structure at lower temperatures. The second χ m peak observed at 11 K reflects a specific high-frequency feature, connected to vortex-antivortex dynamics and eventual spin reorientation transition of the Eu 2+ canted ferromagnetic subsystem. The two peaks merge and vanish upon application of an in-plane magnetic field, which is compatible with the presence of a quantum critical point below 1 T.

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Section: Methodsmentioning

confidence: 99%

Microwave analysis of the interplay between magnetism and superconductivity in EuFe2(As1−xPx)2
Ghigo
¹
,
Torsello
²
,
Gozzelino
³

et al. 2019
Phys. Rev. Research
24
1
29
0
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“…In the case of BaFe 2 (As 1−x P x ) 2 irradiated by 3 MeV protons, we also found that the suppression rate of T c is larger compared with similar compounds. We attribute this enhanced suppression of T c to the generation of Fe 2 P, which is one of possible magnetic compounds that can also generate magnetic scattering [101]. [59].…”

Section: Phase Diagram and Comparisons With Other Compounds And Irradiationmentioning

confidence: 97%

Effect of Controlled Artificial Disorder on the Magnetic Properties of EuFe2(As1−xPx)2 Ferromagnetic Superconductor

et al. 2021

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Static (DC) and dynamic (AC, at 14 MHz and 8 GHz) magnetic susceptibilities of single crystals of a ferromagnetic superconductor, EuFe2(As1−xPx)2 (x = 0.23), were measured in pristine state and after different doses of 2.5 MeV electron or 3.5 MeV proton irradiation. The superconducting transition temperature, Tc(H), shows an extraordinarily large decrease. It starts at Tc(H=0)≈24K in the pristine sample for both AC and DC measurements, but moves to almost half of that value after moderate irradiation dose. Remarkably, after the irradiation not only Tc moves significantly below the FM transition, its values differ drastically for measurements at different frequencies, ≈16 K in AC measurements and ≈12 K in a DC regime. We attribute such a large difference in Tc to the appearance of the spontaneous internal magnetic field below the FM transition, so that the superconductivity develops directly into the mixed spontaneous vortex-antivortex state where the onset of diamagnetism is known to be frequency-dependent. We also examined the response to the applied DC magnetic fields and studied the annealing of irradiated samples, which almost completely restores the superconducting transition. Overall, our results suggest that in EuFe2(As1−xPx)2 superconductivity is affected by local-moment ferromagnetism mostly via the spontaneous internal magnetic fields induced by the FM subsystem. Another mechanism is revealed upon irradiation where magnetic defects created in ordered Eu2+ lattice act as efficient pairbreakers leading to a significant Tc reduction upon irradiation compared to other 122 compounds. On the other hand, the exchange interactions seem to be weakly screened by the superconducting phase leading to a modest increase of Tm (less than 1 K) after the irradiation drives Tc to below Tm. Our results suggest that FM and SC phases coexist microscopically in the same volume.

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“…1), which is comparable to the residual resistivity of 20 µΩcm and 10 µΩcm reported in Refs. [14,15] and Ref. [16].…”

Section: Methodsmentioning

confidence: 99%

Effects of 6 MeV proton irradiation on the vortex ensemble in BaFe2(As0.67P0.33)2 revealed through

et al. 2020

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The change in vortex ensemble in BaFe2(As0.67P0.33)2, an isovalently doped iron-based superconductor (IBS), is studied through global magnetization measurements and single vortex imaging before and after 6 MeV proton irradiation. The field dependence of the critical current density (Jc) is analyzed through the strong pinning model, with which the pristine sample is consistent. After the irradiation, the Jc aberrates from the strong pinning field dependence of B −5/8 , and evolves to a weaker B −1/3 dependence with an anomalous two-step behavior creating a cusp like feature. The cusp coincides with the field of the local minima in the normalized relaxation rate (S), manifested by increased pinning due to increased intervortex interactions followed by fast vortex dynamics caused by flux activation at higher fields. Furthermore, single vortex imaging reveals that while long-range triangular correlation of the Abrikosov vortex lattice is observed in pristine samples, irradiated samples exhibit a highly disordered glassy vortex state which is more densely packed with increased pinning force. These artificial defects incorporated via proton irradiation have the same pinning effect as Co doping which not only shifts the pinning force to a higher degree but also broadens its distribution, in contrast to P doping which only broadens the pinning distribution without inducing a shift. All in all, through this investigation, we provide a systematic understanding of the pinning behavior in BaFe2(As0.67P0.33)2 through carefully controlling the defects in the system.

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Quasiparticle scattering in 3 MeV proton irradiated BaFe2(As0.67P

Cited by 16 publications

References 39 publications

Microwave analysis of the interplay between magnetism and superconductivity in EuFe2(As1−xPx)2
Ghigo
¹
,
Torsello
²
,
Gozzelino
³

et al. 2019
Phys. Rev. Research
24
1
29
0
View full text Add to dashboard Cite

Microwave analysis of the interplay between magnetism and superconductivity in EuFe2(As1−xPx)2
Ghigo
¹
,
Torsello
²
,
Gozzelino
³

et al. 2019
Phys. Rev. Research
24
1
29
0
View full text Add to dashboard Cite

Effect of Controlled Artificial Disorder on the Magnetic Properties of EuFe2(As1−xPx)2 Ferromagnetic Superconductor

Effects of 6 MeV proton irradiation on the vortex ensemble in BaFe2(As0.67P0.33)2 revealed through

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Quasiparticle scattering in 3 MeV proton irradiated BaFe2(As0.67P

Cited by 16 publications

References 39 publications

Microwave analysis of the interplay between magnetism and superconductivity in EuFe2(As1−xPx)2Ghigo1, Torsello2, Gozzelino3 et al. 2019Phys. Rev. Research241290View full textAdd to dashboardCite

Microwave analysis of the interplay between magnetism and superconductivity in EuFe2(As1−xPx)2Ghigo1, Torsello2, Gozzelino3 et al. 2019Phys. Rev. Research241290View full textAdd to dashboardCite

Effect of Controlled Artificial Disorder on the Magnetic Properties of EuFe2(As1−xPx)2 Ferromagnetic Superconductor

Effects of 6 MeV proton irradiation on the vortex ensemble in BaFe2(As0.67P0.33)2 revealed through

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About

Microwave analysis of the interplay between magnetism and superconductivity in EuFe2(As1−xPx)2
Ghigo
¹
,
Torsello
²
,
Gozzelino
³

et al. 2019
Phys. Rev. Research
24
1
29
0
View full text Add to dashboard Cite

Microwave analysis of the interplay between magnetism and superconductivity in EuFe2(As1−xPx)2
Ghigo
¹
,
Torsello
²
,
Gozzelino
³

et al. 2019
Phys. Rev. Research
24
1
29
0
View full text Add to dashboard Cite