Observation of a commensurate array of flux chains in tilted flux lattices in Bi-Sr-Ca-Cu-O single crystals

Bolle, C. A.; Gammel, P. L.; Grier, David G.; Murray, Cherry A.; Bishop, David J.; Mitzi, D. B.; Kapitulnik, A.

doi:10.1103/physrevlett.66.112

Cited by 225 publications

(46 citation statements)

References 12 publications

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“…In this paper we are concerned with the vortex chains that appear in a certain regime of tilted magnetic fields. These chains, which consist of a high density of flux lines perpendicular to the layers, were first observed with the Bitter decoration technique by Bolle et al 6 A qualitative explanation followed shortly 7 in terms of the proposed crossing-lattice state in tilted fields. 8,9 This state consists of a lattice of flux lines perpendicular to the layers crossed by a lattice of flux lines along the layers.…”

Section: 5mentioning

confidence: 89%

Phase transitions in isolated vortex chains

Dodgson

2002

Phys. Rev. B

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In very anisotropic layered superconductors (e.g. Bi2Sr2CaCu2Ox) a tilted magnetic field can penetrate as two co-existing lattices of vortices parallel and perpendicular to the layers. At low out-of-plane fields the perpendicular vortices form a set of isolated vortex chains, which have recently been observed in detail with scanning Hall-probe measurements. We present calculations that show a very delicate stability of this isolated-chain state. As the vortex density increases along the chain there is a first-order transition to a buckled chain, and then the chain will expel vortices in a continuous transition to a composite-chain state. At low densities there is an instability towards clustering, due to a long-range attraction between the vortices on the chain, and at very low densities it becomes energetically favorable to form a tilted chain, which may explain the sudden disappearance of vortices along the chains seen in recent experiments.

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Section: 5mentioning

confidence: 89%

Phase transitions in isolated vortex chains

Dodgson

2002

Phys. Rev. B

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“…On the other hand, vortex structures such as the hexagonal lattice [6] and vortex chains [7] are formed as a result of the magnetic interaction between vortices which exists on a length scale given by the penetration depth X. Magnetic interactions with defects are not generally thought to induce significant pinning.…”

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confidence: 99%

Observation of a novel vortex structure driven by magnetic interactions near a sawtooth twin boundary inYBa2Cu3
Pl¹,
Ca²,
Dj³
et al. 1992
Phys. Rev. Lett.
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We have used magnetic decoration to study the pattern of vortices formed near an isolated sawtooth twin boundary in single-crystal YBa2Cu3-O7-5. When the pitch of the sawtooth is comparable to both the intervortex spacing and the penetration depth, we find an unusual vortex structure which has a reduced symmetry relative to the sawtooth itself. This vortex pattern arises from the magnetic interaction between the vortices and the twin boundary which occurs for an asymmetric twin. This is the first observation of a vortex structure caused by the magnetic interaction with a crystalline defect.PACS numbers: 74.60.GeMeasurements of the interactions which pin magnetic vortices to defects in the oxide superconductors are important in the quest to engineer materials with the highest possible critical currents. To date, most such studies have relied on transport and magnetization measurements [1]. In YBa2Cu307-5, the most heavily studied of the high-r^. materials, extended defects appear to be particularly promising as pinning sites. These can either be columnar pins [2] introduced through ion bombardment, screw dislocations [3], or the ubiquitous twin boundaries [4] found in most as-grown single crystals.Pinning of vortices normally arises as a result of the interaction between the normal core, of the size of the coherence length (^, and defects in the superconducting crystal [5]. On the other hand, vortex structures such as the hexagonal lattice [6] and vortex chains [7] are formed as a result of the magnetic interaction between vortices which exists on a length scale given by the penetration depth X. Magnetic interactions with defects are not generally thought to induce significant pinning. However, the oxide superconductors are strongly type II with >.>(^. Therefore the major part of the vortex energy is carried by the persistent currents which circulate around the vortex at an average distance X from the vortex axis. This suggests that purely magnetic interactions with energy of order 0oA^ per unit length of vortex line may play a role in pinning vortices to extended defects in addition to the familiar core pinning which has an energy of the same order,//.^^ 2-0^ AI Although the pinning/orc^ due to the core is still greater by a factor of X/^, the magnetic part of the interaction energy can be important in determining the equilibrium flux-lattice structure in the vicinity of an extended defect and thereby can indirectly affect the pinning of vortices to that defect.In this Letter we report on the vortex patterns seen near a peculiar type of sawtooth twin occasionally found in single-crystal YBa2Cu307-5. We find a pattern in which the vortices populate only one side of the teeth of the sawtooth. By contrast, previous observations of straight twins only showed a uniform line of vortices at the boundary. We argue that the surprisingly regular distortions of the flux-line lattice caused by this boundary can be understood by assuming purely magnetic interactions between the vortices and an asymmetric sawtooth twin. This i...

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“…Vortex chains embedded in approximately triangular vortex lattices have been observed. 11,12 This vortex ordering has attracted theoretical attention and the coexistence of two vortex species has been suggested. [13][14][15] Experimentally, Grigorieva et al concluded that vortex chains embedded in the vortex lattice consist of two inclined vortex species which have different angles from the c axis.…”

mentioning

confidence: 99%

Observation of a commensurate array of flux chains in tilted flux lattices in Bi-Sr-Ca-Cu-O single crystals

Cited by 225 publications

References 12 publications

Phase transitions in isolated vortex chains

Phase transitions in isolated vortex chains

Observation of a novel vortex structure driven by magnetic interactions near a sawtooth twin boundary inYBa2Cu3
Pl¹,
Ca²,
Dj³
et al. 1992
Phys. Rev. Lett.
Self Cite
27
3
12
0
View full text Add to dashboard Cite

Vortex matter transition inBi2Sr2CaCu2
Ooi
¹
,
Shibauchi
²
,
Itaka
³

et al. 2000
Phys. Rev. B
37
2
10
0
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Observation of a commensurate array of flux chains in tilted flux lattices in Bi-Sr-Ca-Cu-O single crystals

Cited by 225 publications

References 12 publications

Phase transitions in isolated vortex chains

Phase transitions in isolated vortex chains

Observation of a novel vortex structure driven by magnetic interactions near a sawtooth twin boundary inYBa2Cu3Pl1, Ca2, Dj3 et al. 1992Phys. Rev. Lett.Self Cite273120View full textAdd to dashboardCite

Vortex matter transition inBi2Sr2CaCu2Ooi1, Shibauchi2, Itaka3 et al. 2000Phys. Rev. B372100View full textAdd to dashboardCite

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Observation of a novel vortex structure driven by magnetic interactions near a sawtooth twin boundary inYBa2Cu3
Pl¹,
Ca²,
Dj³
et al. 1992
Phys. Rev. Lett.
Self Cite
27
3
12
0
View full text Add to dashboard Cite

Vortex matter transition inBi2Sr2CaCu2
Ooi
¹
,
Shibauchi
²
,
Itaka
³

et al. 2000
Phys. Rev. B
37
2
10
0
View full text Add to dashboard Cite