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Vlasko-Vlasov, Vitalii; Dorosinskii, Lev; Polyanskii, Anatolii; Никитенко, В. И.; Welp, U.; Veal, B. W.; Crabtree, G. W.

doi:10.1103/physrevlett.72.3246

Cited by 106 publications

(55 citation statements)

References 26 publications

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“…Similar to Ref. [35], we suggest that the vortices are not trapped on the twin boundary. The most likely explanation for the difference in the proximity of the vortices to the twin boundary in the cuprates vs. the pnictides could be the observed difference between the superfluid change on the twin boundary (reduction vs. enhancement) [22,23].…”

supporting

confidence: 89%

Behavior of vortices near twin boundaries in underdoped Ba(Fe1−xCox)2As<

et al. 2011

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We use scanning SQUID microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe 1-x Co x ) 2 As 2 . We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: they tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe 1-x Co x ) 2 As 2 . The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors. 2Dissipation from moving vortices is a major limitation for the use of superconductors in high current density applications. Vortex motion in superconductors is controlled by competition between the Lorentz force in the presence of an applied current, thermal energy, the interactions between vortices, and their interaction with the local pinning landscape [1][2][3][4][5]. Sources of pinning locally reduce the free energy of a vortex that passes though them, resulting in improved critical current in samples with strong pinning [1,[6][7][8][9][10]. The various types of pinning sources, including oxygen vacancies, impurities, dislocations, extended columnar defects caused by irradiation, and others [1,[11][12][13][14][15], can be broadly categorized by the dimensionality of the pinning potentiality. One technologically important two-dimensional pinning source is grain boundaries, the boundaries between grains with different crystalline orientations [16]. If the angle between the two grains is low, dislocations are formed, separated by regions that are well lattice-matched. In this case, the lattice-matched area remains superconducting and the dislocations act as pinning sites. At high angles the misorientation is hard to accommodate, the superconductivity is reduced, and the grain boundary behaves like a Josephson junction. Twin boundaries are a particular kind of grain boundary formed in materials with orthorhombic symmetry by a nearly 90 degree rotation around the c-axis, or equivalently by an interchange between the a and b crystalline axes. Twin boundaries can be found in many of the relatively new family of pnictide superconductors [17,18]. The 122 pnictide compounds undergo a tetragonal to orthorhombic transition and twin formation occurs prior to entering the superconducting phase in the underdoped part of the superconducting dome [19][20][21]. We have previously reported enhanced superfluid density on twin boundaries in the Cobalt-doped 122 pnictide family [22,23], while bulk magnetization measurements show enhanced vortex pinning associated with the presence of twins [24].In the present work we wish to examine the effect of twin boundaries in pnictides on the vortices and their dynamics. We use scanning Superconducting QUantum Interference Device (SQUID) microscopy, which is local and sensitive enough to measure both individual vortices and the loc...

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supporting

confidence: 89%

Behavior of vortices near twin boundaries in underdoped Ba(Fe1−xCox)2As<

et al. 2011

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“…When this happens the TB acts as a pinning site because of the reduced energetic cost of locating a vortex core on it. Such pinning behavior has been observed in the cuprates 13,14,16,21,25 where TBs also act as channels that are easy for vortices to move along, and hard for them to cross [17][18][19][20][21]25 . Other behavior is also possible.…”

Section: Introductionmentioning

confidence: 95%

“…TBs are not limited to FeSCs -they occur in many superconductors, including cuprates [13][14][15][16][17][18][19][20][21][22][23][24][25] , and are important for several reasons. In Fe-SCs their properties encode information about the nature of the superconducting phase and its competing orders [26][27][28] .…”

Section: Introductionmentioning

confidence: 99%

Diamagnetic vortex barrier stripes in underdopedBaFe2(As1−xPx)2

et al. 2016

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We report magnetic force microscopy (MFM) measurements on underdoped BaFe2(As1−xPx)2 (x = 0.26) that show enhanced superconductivity along stripes parallel to twin boundaries. These stripes of enhanced diamagnetic response repel superconducting vortices and act as barriers for them to cross. The width of the stripes is hundreds of nanometers, on the scale of the penetration depth, well within the inherent spatial resolution of MFM and implying that the width is set by the interaction of the superconductor with the MFM's magnetic tip. Unlike similar stripes observed previously by scanning SQUID in the electron doped Ba(Fe1−xCox)2As2, the stripes in the isovalently doped BaFe2(As1−xPx)2 disappear gradually when we warm the sample towards the superconducting transition temperature. Moreover, we find that the stripes move well below the reported structural transition temperature in BaFe2(As1−xPx)2 and that they can be much denser than in the Ba(Fe1−xCox)2As2 study. When we cool in finite magnetic field we find that some vortices appear in the middle of stripes, suggesting that the stripes may have an inner structure, which we cannot resolve. Finally, we use both vortex decoration at higher magnetic field and deliberate vortex dragging by the MFM magnetic tip to obtain bounds on the strength of the interaction between the stripes and vortices. We find that this interaction is strong enough to play a significant role in determining the critical current in underdoped BaFe2(As1−xPx)2.

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“…3,4 This thermodynamic state of the flux-line lattice is easily destroyed, however, with the introduction of pointlike random disorder such as that generated by proton irradiation 5,6 or by the introduction of linearly correlated defects such as columnar tracks induced via heavy-ion irradiation [7][8][9] and naturally growing twin boundaries. 10,11 In the first case, an entanglement of vortex lines is promoted in the liquid state by vortex pinning in these defects. Then the transition to the solid state occurs as a second-order vortex glass transition.…”

Section: Introductionmentioning

confidence: 99%

Vortex liquid entanglement in twinnedYBa2Cu3O7
Puig
¹
,
Galante
²
,
González
³

et al. 1999
Phys. Rev. B
34
1
15
1
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The angular dependence of the in-plane resistivity (T,H,) of melt textured YBa 2 Cu 3 O 7 /Y 2 BaCuO 5 composites has been measured in a large range of magnetic fields and temperatures and from them, the intrinsic anisotropy of the superconducting state has been verified following the anisotropic Ginzburg-Landau approach. The influence of correlated defects like twin boundaries and quenched disorder generated by Y 2 BaCuO 5 precipitates on the pinning behavior of these composites in the liquid vortex state is analyzed, and the corresponding phase diagram is determined and compared to that of twinned single crystals. We show that the irreversibility line displays an upwards shift due to twin boundary pinning enabling to define a ''quenched'' Bose glass transition. A new region in the vortex liquid state is identified where twin boundary pinning defines a partially entangled liquid vortex state characterized by a short-range c-axis vortex coherence. The transition to the entangled liquid phase is experimentally determined. The relevance of this depinning line and its unique position with respect to twinned single crystals is discussed. ͓S0163-1829͑99͒01741-5͔

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Study of the influence of individual twin boundaries on the magnetic flux penetration inYBa2Cu3<

Cited by 106 publications

References 26 publications

Behavior of vortices near twin boundaries in underdoped Ba(Fe1−xCox)2As<

Behavior of vortices near twin boundaries in underdoped Ba(Fe1−xCox)2As<

Diamagnetic vortex barrier stripes in underdopedBaFe2(As1−xPx)2

Vortex liquid entanglement in twinnedYBa2Cu3O7
Puig
¹
,
Galante
²
,
González
³

et al. 1999
Phys. Rev. B
34
1
15
1
View full text Add to dashboard Cite

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Study of the influence of individual twin boundaries on the magnetic flux penetration inYBa2Cu3<

Cited by 106 publications

References 26 publications

Behavior of vortices near twin boundaries in underdoped Ba(Fe1−xCox)2As<

Behavior of vortices near twin boundaries in underdoped Ba(Fe1−xCox)2As<

Diamagnetic vortex barrier stripes in underdopedBaFe2(As1−xPx)2

Vortex liquid entanglement in twinnedYBa2Cu3O7Puig1, Galante2, González3 et al. 1999Phys. Rev. B341151View full textAdd to dashboardCite

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About

Vortex liquid entanglement in twinnedYBa2Cu3O7
Puig
¹
,
Galante
²
,
González
³

et al. 1999
Phys. Rev. B
34
1
15
1
View full text Add to dashboard Cite