The role of surface effects in magnetization of high-Tc superconductors

Kopylov, V. N.; Koshelev, A. E.; Schegolev, I.F.; Togonidze, T.G.

doi:10.1016/0921-4534(90)90326-a

Cited by 234 publications

(76 citation statements)

References 10 publications

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“…This finding supports our previous interpretation [10] that the second-peak effect in the DC-magnetization (anomalous second maximum in the magnetization hysteresis curves [19]) is related to the dimensional crossover from a soft and partially depinned 3D lattice for H < H* to a rigidly pinned quasi-2D lattice for H > H* (Fig. 10a).…”

Section: Fig 2 (Left)supporting

confidence: 81%

Muon Spin Rotation Studies of the Vortex Matter in the High-T_cSuperconductor Bi₂Sr₂CaCu₂O_8+δ

Bläsius

Niedermayer

Tallon³

et al. 1999

Acta Phys. Pol. A

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We report muon spin rotation studies of the magnetic field distribution n(B) in the vortex state of the high-temperature superconductor Bi2 Sr2 CaCu2 O8+δ. From our data on three sets of overdoped, nearly optimized and underdoped smgle crystals we obtain evidence for a two-stage melting process of the vortex matter under equilibrium. conditions. In the irreversible regime well below the irreversibility line we observe a transition in the vortex state which we associate with an intra-planar melting transition. The resulting flux-lme liquid phase persists over a sizeable temperature interval before the inter-planar decoupling of the mdividual vortex lines takes place in a second step at the irreversibility lme, resultmg in a pancake liquid phase.PACS numbers: 74.60. Ge, 74.25.Dw, 74.72.Hs, 76.75.+i The vortex matter in cuprate high-T c superconductors exhibits a complex (H, T)-phase diagram as a function of magnetic field, temperature and doping [1]. The short superconducting (SC) coherence length, the high transition temperatures and the strongly anisotropic layered structure favor thermal fluctuations which dominate the vortex state well below the upper critical field H c2(T). In contrast to conventional type-II superconductors, a melting transition of the flux-line lattice (FLL) was proposed [2] and confirmed experimentally [3]. Nevertheless, the details of this melting transition are not yet fully understood.(245)

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Section: Fig 2 (Left)supporting

confidence: 81%

Muon Spin Rotation Studies of the Vortex Matter in the High-T_cSuperconductor Bi₂Sr₂CaCu₂O_8+δ

Bläsius

Niedermayer

Tallon³

et al. 1999

Acta Phys. Pol. A

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“…The Bean-Livingston barrier is a known source of anomalies in the magnetization curves of type-II superconductors 47 , because the barrier profile in the vicinity of the grain boundary differs in increasing or decreasing |H a |.…”

Section: Collapse Of the Josephson Supercurrent Close To Zero Magnmentioning

confidence: 99%

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

et al. 2016

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Superconducting hybrid junctions are revealing a variety of novel effects. Some of them are due to the special layout of these devices, which often use a coplanar configuration with relatively large barrier channels and the possibility of hosting Pearl vortices. A Josephson junction with a quasi ideal two-dimensional barrier has been realized by growing graphene on SiC with Al electrodes. Chemical Vapor Deposition offers centimeter size monolayer areas where it is possible to realize a comparative analysis of different devices with nominally the same barrier. In samples with a graphene gap below 400 nm, we have found evidence of Josephson coherence in presence of an incipient BerezinskiiKosterlitz-Thouless transition. When the magnetic field is cycled, a remarkable hysteretic collapse and revival of the Josephson supercurrent occurs. Similar hysteresis are found in granular systems and are usually justified within the Bean Critical State model (CSM). We show that the CSM, with appropriate account for the low dimensional geometry, can partly explain the odd features measured in these junctions.

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“…Such behavior has been observed previously, e.g. for cuprate high-temperature superconductors, and has been attributed to thermal creep in the presence of bulk pinning and surface barrier effects [45,48].…”

Section: Resultsmentioning

confidence: 65%

Critical fields and vortex pinning in overdopedBa0.2K0.8Fe2As2

et al. 2015

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We determine the upper and lower critical fields, the penetration depth and the vortex pinning characteristics of single crystals of overdoped Ba 0.2 K 0.8 Fe 2 As 2 with T c ~ 10 K. We find that bulk vortex pinning is weak and vortex dynamics to be dominated by the geometrical surface barrier. The temperature dependence of the lower critical field, H c1 , displays a distinctive upturn at low temperatures, which is suggestive of two distinct superconducting gaps.Furthermore, the penetration depth, λ, varies linearly with temperature below 4 K indicative of line nodes in the superconducting gap. These observations can be well described in a model based on a multi-band nodal superconducting gap.

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The role of surface effects in magnetization of high-Tc superconductors

Cited by 234 publications

References 10 publications

Muon Spin Rotation Studies of the Vortex Matter in the High-T_cSuperconductor Bi₂Sr₂CaCu₂O_8+δ

Muon Spin Rotation Studies of the Vortex Matter in the High-T_cSuperconductor Bi₂Sr₂CaCu₂O_8+δ

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

Critical fields and vortex pinning in overdopedBa0.2K0.8Fe2As2

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The role of surface effects in magnetization of high-Tc superconductors

Cited by 234 publications

References 10 publications

Muon Spin Rotation Studies of the Vortex Matter in the High-TcSuperconductor Bi2Sr2CaCu2O8+δ

Muon Spin Rotation Studies of the Vortex Matter in the High-TcSuperconductor Bi2Sr2CaCu2O8+δ

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

Critical fields and vortex pinning in overdopedBa0.2K0.8Fe2As2

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Muon Spin Rotation Studies of the Vortex Matter in the High-T_cSuperconductor Bi₂Sr₂CaCu₂O_8+δ

Muon Spin Rotation Studies of the Vortex Matter in the High-T_cSuperconductor Bi₂Sr₂CaCu₂O_8+δ