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Grigorieva, I.V.; Steeds, John W; Sasaki, Katsuhiro

doi:10.1103/physrevb.48.16865

Cited by 29 publications

(10 citation statements)

References 16 publications

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“…Therefore the pattern observed will not be the true equilibrium con® guration for the decoration temperature; this is of course true for nearly all measurements made on superconductors. Recent estimates (Gammel et al 1992, Grigorieva et al 1993, Marchevsky et al 1997 indicate that T may be as high as (0.8± 0.9) Tc. The quality of the decoration is strongly dependent on the sample in question.…”

Section: Principles Of Bitter Decorationmentioning

confidence: 96%

Local magnetic probes of superconductors

Bending¹

1999

Advances in Physics

191

146

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Section: Principles Of Bitter Decorationmentioning

confidence: 96%

Local magnetic probes of superconductors

Bending¹

1999

Advances in Physics

191

146

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“…A second reason is the fact that several previous decoration studies make this a wellcharacterized material. [7][8][9][10] In our particular case, we study a sample with TB's oriented in only one direction. When tilting an external magnetic field with rotation axis in the ab planes and perpendicular to the twin boundary planes there is a systematic change in the vortex-vortex interaction ͑because of the an-isotropy͒ and in the effect of pinning by twin boundaries.…”

Section: Introductionmentioning

confidence: 99%

Interplay between pinning energy and vortex interaction inYBa2Cu3O
Herbsommer
¹
,
Nieva
²
,
Luzuriaga
³

2000
Phys. Rev. B
20
2
16
0
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We have performed Bitter decoration and ac susceptibility measurements in single-crystal YBa 2 Cu 3 O 7Ϫ␦ with oriented twin boundaries. The twin boundaries ͑TB's͒ pin vortices over approximately 65% of the sample. The pinned areas are unevenly distributed and some relatively large TB-free regions are present. The Bitter decorations were performed in a 52 Oe dc magnetic field rotated off the c axis so that the plane defined by the field direction and the c axis is perpendicular to the TB's. Several decorations were performed in the same sample. Additional dynamical information was obtained from ac susceptibility measurements. Results show that for small tilts the vortices remain locked to the c-axis direction, for angles greater than 12°they form a staircase pattern, and in this case pinning by the twin boundaries remains effective up to 75°. We observe vortex chains in twin-free zones of the sample for tilted fields at 65°and 40°. Due to our particular experimental arrangement, in the twinned regions the interplay of the potentials giving rise to the chains and the pinning potential produces a structure with a disordered square symmetry. The data allow us to estimate the dominant energy of the vortex system for some inclinations of the applied magnetic field.

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“…We have used the cutoff suggested by Sudbø and Brandt, where S (k) = exp −2g(k) and 2 . This cutoff appears more physical than a cutoff that just depends on k ⊥ and allows the elastic instabilities and the nonmonotonic behavior of φ(θ)…”

Section: Discussionmentioning

confidence: 99%

Instabilities in the flux-line lattice of anisotropic superconductors

Thompson

Moore

1997

Phys. Rev. B

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The stability of the flux-line lattice has been investigated within anisotropic London theory. This is a full-scale investigation of instabilities in the ''chain'' state, the equilibrium lattice that is similar to the Abrikosov lattice at large fields but crosses over smoothly to a pinstripe structure at low fields. By calculating the normal modes of the elasticity matrix, it has been found the lattice is stable at large fields, but that instabilities occur as the field is reduced. The field at which these instabilities first arise, b*(⑀,), depends on the anisotropy ⑀ and the angle at which the lattice is tilted away from the c axis. These instabilities initially occur at wave vector k*(⑀,). The dependence of k* on ⑀ and is complicated, but the component of k* along the average direction of the flux lines, k z , is always finite. For rigid straight flux lines, the cutoff necessary for London theory has been ''derived'' from Landau-Ginzburg theory, where the shape of the vortex core is known. However, for investigating instability at finite k z it is necessary to know the dependence of the cutoff on k z , and we have used a cutoff suggested by Sudbo " and Brandt. The instabilities only occur for values of the anisotropy ⑀ appropriate to a material like BSCCO, and not for anisotropies more appropriate to YBCO. The lower critical field H c 1 () is calculated as a function of the angle at which the applied field is tilted away from the crystal axis. The presence of kinks in H c 1 () is seen to be related to instabilities in the equilibrium flux-line structure.

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Observation of a mixed vortex chains–vortex lattice phase in tilted magnetic fields inYBa2(Cu1

Cited by 29 publications

References 16 publications

Local magnetic probes of superconductors

Local magnetic probes of superconductors

Interplay between pinning energy and vortex interaction inYBa2Cu3O
Herbsommer
¹
,
Nieva
²
,
Luzuriaga
³

2000
Phys. Rev. B
20
2
16
0
View full text Add to dashboard Cite

Instabilities in the flux-line lattice of anisotropic superconductors

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Observation of a mixed vortex chains–vortex lattice phase in tilted magnetic fields inYBa2(Cu1

Cited by 29 publications

References 16 publications

Local magnetic probes of superconductors

Local magnetic probes of superconductors

Interplay between pinning energy and vortex interaction inYBa2Cu3OHerbsommer1, Nieva2, Luzuriaga3 2000Phys. Rev. B202160View full textAdd to dashboardCite

Instabilities in the flux-line lattice of anisotropic superconductors

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Product

Resources

About

Interplay between pinning energy and vortex interaction inYBa2Cu3O
Herbsommer
¹
,
Nieva
²
,
Luzuriaga
³

2000
Phys. Rev. B
20
2
16
0
View full text Add to dashboard Cite