Blatter, Geshkenbein, and Larkin reply

Blatter, G.; Geshkenbeǐn, V. B.; Larkin, A. I.

doi:10.1103/physrevlett.71.302

Cited by 412 publications

(888 citation statements)

References 4 publications

Supporting

Mentioning

845

Contrasting

Order By: Relevance

“…4 for Hϭ2 T. Thus the interpretation of ⌰ sym as a measure of the trapping angle is ruled out. Moreover, if in a certain angular range vortices were not forming staircases, pinning could be described by a scalar disorder strength, then at high fields M i (⌰) should follow the anisotropy scaling law 18 M i (H,⌰) ϭM i ͓ (⌰)H͔. Consistently, we do not observe such scaling in any angular range.…”

supporting

confidence: 71%

Evidence for vortex staircases in the whole angular range due to competing correlated pinning mechanisms

et al. 1999

View full text Add to dashboard Cite

We present measurements of the angular dependence of the irreversible magnetization of YBa 2 Cu 3 O 7 single crystals with columnar defects inclined with respect to the c axis. At high fields a sharp maximum centered at the tracks direction is observed. At low fields we identify a lock-in phase characterized by an angleindependent pinning strength and observe an angular shift of the peak towards the c axis that originates in the misalignment between vortices and applied field in anisotropic materials. The interplay among columnar defects, twins, and intrinsic pinning by the ab planes generates a variety of staircase structures. We show that correlated pinning dominates for all orientations of the applied field. ͓S0163-1829͑99͒09417-5͔A difficult aspect of the study of vortex dynamics in hightemperature superconductors in the presence of correlated disorder is the determination of flux structures for applied fields tilted with respect to the pinning potential. As threedimensional vortex configurations cannot be directly observed, our knowledge is mostly based on the analysis of the angular dependence of magnetization, susceptibility, or transport data. [1][2][3][4][5][6][7][8][9][10][11] According to theoretical models, 12,13 when the angle between the applied field H and the defects is smaller than the lock-in angle L vortices remain locked into the defects thus producing a transverse Meissner effect. For tilt angles larger than L and smaller than a trapping angle T , vortices form staircases with segments pinned into different defects and connected by unpinned or weakly pinned kinks. Beyond T , vortices will be straight and take the direction of the applied field, thus being unaffected by the correlated nature of the pinning. In principle, this picture should apply with minor differences to twins, columnar defects, and intrinsic pinning. 13 Many experiments have confirmed the directional pinning due to columnar defects, twins, and Cu-O planes. 1-11 Evidence for a locked-in phase arises from the observation of the transverse Meissner effect, 10 but a quantitative determination of L (H,T) for columnar defects had not been done until now. The introduction of columnar defects inclined with respect to the crystallographic axis has been used 1,6-8,10,11 to discriminate their pinning effects from those due to twin boundaries, and from anisotropy effects. However, the vortex staircase configurations resulting from the combined effect of the various correlated structures had not yet been explored in detail.In this work we report studies of the vortex pinning in YBa 2 Cu 3 O 7 crystals with inclined columnar defects, for the whole range of field orientations. This allows us to determine the misalignment between the applied and internal fields due to anisotropy, as well as to identify the angular range of influence of each correlated pinning structure. We present the first determination of the lock-in angle of tracks using irreversible magnetization.The crystal used in this study was grown by the self-flux method, 14 and ...

show abstract

supporting

confidence: 71%

Evidence for vortex staircases in the whole angular range due to competing correlated pinning mechanisms

et al. 1999

View full text Add to dashboard Cite

show abstract

“…Typical values for°are°Y BCO º 0:16 and°B SCCO º 10 ¡2 for the two high-T c materials YBCO and BSCCO. It was shown by Blatter et al (1992) (for a more detailed discussion, see Blatter et al (1994)), that in the case of µ ¾ 1 the result for a thermodynami c quantity Q…#; H ; T ;¹; ¶ ;°;D † of T . Nattermann and S. Scheidl 614 an anisotropic superconductor (where # denotes the angle between the magnetic ® eld direction and the xy plane, and D the strength of disorder) can be obtained from the corresponding result e Q for the isotropic system by the relation Q…#; H ; T ;¹; ¶ ;°;D †ˆs Q e Q…°#H ;T =°; ¹; ¶; D=° †;…”

Section: …2:14 †mentioning

confidence: 95%

Vortex-glass phases in type-II superconductors

Nattermann

Scheidl

2000

Advances in Physics

337

383

View full text Add to dashboard Cite

A review is given on the theory of vortex-glass phases in impure type-II superconductors in an external field. We begin with a brief discussion of the effects of thermal fluctuations on the spontaneously broken U(1) and translation symmetries, on the global phase diagram and on the critical behaviour. Introducing disorder we restrict ourselves to the experimentally most relevant case of weak uncorrelated randomness which is known to destroy the long-ranged translational order of the Abrikosov lattice in three dimensions. Elucidating possible residual glassy ordered phases, we distinguish betwee positional and phase-coherent vortex glasses. The discussion of elastic vortex glasses, in two and three dimensions occupy the main part of our review. In particular, in three dimensions there exists an elastic vortex-glass phase which still shows quasi-long-range translational order: the `Bragg glass'. It is shown that this phase is stable with respect to the formation of dislocations for intermediate fields. Preliminary results suggest that the Bragg-glass phase may not show phase-coherent vortex-glass order. The latter is expected to occur in systems with weak disorder only in higher dimensions. We further demonstrate that the linear resistivity vanishes in the vortex-glass phase. The vortex-glass transition is studied in detail for a superconducting film in a parallel field. Finally, we review some recent developments concerning driven vortex-line lattices moving in a random environment.Comment: 133 pages Latex with figures. accepted for publication in Adv. Phy

show abstract

“…Much progress has been made by considering the summation problem in terms of the theory for elastic media in a random potential. An extensive theoretical overview which deals with the above questions in great detail will appear soon [1]. In the first part of these lecture notes, Sections 2, 3 and 4, I will discuss a few model systems and show some experimental results to illustrate the physical picture.…”

Section: Introductionmentioning

confidence: 99%

Pinning and Dynamics of Magnetic Vortices

Kes

1994

The Vortex State

View full text Add to dashboard Cite

Blatter, Geshkenbein, and Larkin reply

Cited by 412 publications

References 4 publications

Evidence for vortex staircases in the whole angular range due to competing correlated pinning mechanisms

Evidence for vortex staircases in the whole angular range due to competing correlated pinning mechanisms

Vortex-glass phases in type-II superconductors

Pinning and Dynamics of Magnetic Vortices

Contact Info

Product

Resources

About