Effects of particle irradiations on vortex states in iron-based superconductors

Tamegai, T.; Taen, Toshihiro; Yagyuda, Hidenori; Tsuchiya, Yuji; Mohan, Shyam; Taniguchi, Tomotaka; Nakajima, Yasuyuki; Okayasu, Satoru; Sasase, Masato; Kitamura, Hisashi; Murakami, Takeshi; Kambara, T.; Kanai, Yasuyuki

doi:10.1088/0953-2048/25/8/084008

Cited by 105 publications

(121 citation statements)

References 48 publications

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“…This field-dependent enhancement in Jc is not surprising. Similar to defects created by particle irradiation 4,14 , the efficacy of the BZO in immobilizing vortices is magnified as the number of vortices approaches the number of available pinning sites. Consistent with other studies 11,12,15,16 , Jc is also high in films without nanoparticles.…”

Section: Th) and S(th)mentioning

confidence: 99%

“…8,23 , where the data for FeSe was extracted from S(H) at different temperatures 9 and we measured Rb0.8Fe1.6SeS 41 . All previous studies of creep in Fe-SCs have been performed on single crystals [5][6][7][8]14,19,22,23,32,[42][43][44] , where self-fields (Hsf ∝ Jc × thickness) are higher than in our films. Consequently, we perform a direct comparison at !…”

Section: S(t) Data From Ybco Samples With Different Microstructures (mentioning

confidence: 99%

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Universal lower limit on vortex creep in superconductors

et al. 2017

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The search for a universal description of vortex matter -one that is applicable to a range of systems and regimes -is a formidable challenge, complicated by the complexity of the interactions between vortices and the environment. Vortex motion that can be induced by Magnus and Lorentz forces or thermal activation can also be counteracted by pinning forces. Because vortex cores are normal (i.e., superfluidity or superconductivity is destroyed inside them), creating a vortex costs energy, and pinning can occur when it is energetically more favorable for a vortex to appear in one location than in another. In type-II superconductors at high enough magnetic fields, vortices are formed by the penetration of magnetic flux, and material disorder that locally reduces the vortex core energy can produce pinning forces that almost completely preclude vortex motion. This results in nearly zero resistance, as long as the current density (J) does not exceed the critical current density (Jc). The caveat is that, for J

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Section: Th) and S(th)mentioning

confidence: 99%

Section: S(t) Data From Ybco Samples With Different Microstructures (mentioning

confidence: 99%

Universal lower limit on vortex creep in superconductors

et al. 2017

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“…The study of the vortex matter in iron-based superconductors (FeBS) is a tool for achieving a better understanding of the interplay between intrinsic superconducting properties, the critical current density (J c ) and the vortex depinning mechanisms [1]. Vortex dynamics in FeBS presents features that can be understood by considering the collective creep theory [2,3].…”

Section: Introductionmentioning

confidence: 99%

Vortex dynamics inβ-FeSe single crystals: effects of proton irradiation and small inhomogeneous stress

Amigó¹,

Haberkorn²,

Pérez³

et al. 2017

Supercond. Sci. Technol.

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Abstract.We report on the critical current density Jc and the vortex dynamics of pristine and 3 MeV proton irradiated (cumulative dose equal to 2×10 16 cm −2 ) β-FeSe single crystals.We also analyze a remarkable dependence of the superconducting critical temperature Tc, Jc and the flux creep rate S on the sample mounting method. Free-standing crystals present Tc=8.4(1)K, which increases to 10.5(1)K when they are fixed to the sample holder by embedding them with GE-7031 varnish. On the other hand, the irradiation has a marginal effect on Tc. The pinning scenario can be ascribed to twin boundaries and random point defects. We find that the main effect of irradiation is to increase the density of random point defects, while the embedding mainly reduces the density of twin boundaries. Pristine and irradiated crystals present two outstanding features in the temperature dependence of the flux creep rate: S(T ) presents large values at low temperatures, which can be attributed to small pinning energies, and a plateau at intermediate temperatures, which can be associated with glassy relaxation. From Maley analysis, we observe that the characteristic glassy exponent µ changes from ∼ 1.7 to 1.35-1.4 after proton irradiation.

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“…Until now, most detailed studies on the vortex dynamics were performed on cuprates 3,6,7 and IBSs "122" phase [8][9][10][11][12][13][14] since high-quality single crystals are readily available. Through extensive research activities on the vortex system in cuprate superconductors, the collective creep theory has successfully interpreted novel features of the large creep rate and plateau region in the temperature dependence of normalized relaxation rate (S = |dlnM /dlnt|), and similar features have also been verified in IBSs.…”

mentioning

confidence: 99%

Critical current density, vortex dynamics, and phase diagram of single-crystal FeSe

et al. 2015

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We present a comprehensive study of the vortex pinning and dynamics in a high-quality FeSe single crystal, which is free from doping introduced inhomogeneities and charged quasi-particlescattering because of its innate superconductivity. Critical current density, Jc, is found to be almost isotropic, and reaches a value ∼ 3 × 10 4 A/cm 2 at 2 K (self-field) for both H c and ab. The normalized magnetic relaxation rate S (= |dlnM /dlnt|) shows a temperature insensitive plateau behavior in the intermediate temperature range with a relatively high creep rate (S ∼ 0.02 under zero field), which is interpreted in the framework of the collective creep theory. A crossover from the elastic to plastic creep is observed, while the fish-tail effect is absent for both H c and ab. Based on this observation, the origin of the fish-tail effect is also discussed. Combining the results of Jc and S, vortex motion in FeSe single crystal is found to be dominated by sparse strong point-like pinning from nm-sized defects or imperfections. The weak collective pinning is also observed and proved in the form of large bundles. Besides, the vortex phase diagram of FeSe is also constructed and discussed.

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Effects of particle irradiations on vortex states in iron-based superconductors

Cited by 105 publications

References 48 publications

Universal lower limit on vortex creep in superconductors

Universal lower limit on vortex creep in superconductors

Vortex dynamics inβ-FeSe single crystals: effects of proton irradiation and small inhomogeneous stress

Critical current density, vortex dynamics, and phase diagram of single-crystal FeSe

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