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Ooi, S.; Shibauchi, T.; Itaka, Kenji; Okuda, N.; Tamegai, T.

doi:10.1103/physrevb.63.020501

Cited by 37 publications

(12 citation statements)

References 26 publications

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“…33͒ is in a reasonable agreement with experimental findings 31 H c *(T ϭ45 K)Ϸ430 Oe. Near the ab plane, the properties of the observed anomaly changes abruptly and the field H c * sharply goes to zero, 31 which may indicate a transformation 23 in the JV lattice or a trace of the phase transition from TII to CIII. At higher in-plane fields, the determined stepwise behavior 28 of the vortex-lattice melting transition may be related to the existence of one more phase transition in the solid phase.…”

Section: Discussionmentioning

confidence: 99%

London theory of the crossing vortex lattice in highly anisotropic layered superconductors

2001

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A description of Josephson vortices ͑JV's͒ crossed by the pancake vortices ͑PV's͒ is proposed on the basis of the anisotropic London equations. The field distribution of a JV and its energy have been calculated for both dense (aϽ J ) and dilute (aϾ J ) PV lattices with distance a between PV's and the nonlinear JV core size J . It is shown that the ''shifted'' PV lattice ͑PV's displaced mainly along JV's in the crossing-vortex lattice structure͒, formed in high out-of-plane magnetic fields B z Ͼ⌽ 0 /␥ 2 s 2 ͓A. E. Koshelev, Phys. Rev. Lett. 83, 187 ͑1999͔͒, transforms into the PV lattice ''trapped'' by the JV sublattice at a certain field, lower than ⌽ 0 /␥ 2 s 2 , where ⌽ 0 is the flux quantum, ␥ is the anisotropy parameter, and s is the distance between CuO 2 planes. With further decreasing B z , the free energy of the crossing-vortex lattice structure ͑PV and JV sublattices coexist separately͒ can exceed the free energy of the tilted lattice ͑common PV-JV vortex structure͒ in the case of ␥sϽ ab with the in-plane penetration depth ab if the low (B x Ͻ␥⌽ 0 / ab 2 ) or high (B x տ⌽ 0 /␥s 2 ) in-plane magnetic field is applied. It means that the crossing-vortex structure is realized in the intermediate-field orientations, while the tilted vortex lattice can exist if the magnetic field is aligned near the c axis and the ab plane as well. In the intermediate in-plane fields ␥⌽ 0 / ab 2 ՇB x Շ⌽ 0 /␥s 2 , the crossing-vortex structure with the ''trapped'' PV sublattice seems to settle in until the lock-in transition occurs since this structure has the lower energy with respect to the tilted vortex structure in the magnetic field H oriented near the ab plane. The recent experimental results concerning the vortex-lattice melting transition and transitions in the vortex-solid phase in Bi 2 Sr 2 CaCu 2 O 8ϩ␦ single crystals are discussed in the context of the presented theoretical model.

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Section: Discussionmentioning

confidence: 99%

London theory of the crossing vortex lattice in highly anisotropic layered superconductors

2001

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“…13 In addition, the work of Koshelev explained quantitatively the attraction of perpendicular flux lines that leads to the vortex-chain state in a certain field range. Apart from more detailed work on the melting transition, 4 and on magnetization curves, 5 these concepts have also inspired recent scanning Hall-probe measurements 16 on the vortex-chain state. These experiments are similar to the Bitter decoration technique in that they only probe the field distribution emanating from the surface of the superconductor.…”

Section: 5mentioning

confidence: 99%

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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“…Magnetic anisotropy in high-temperature superconductors has been the subject of many experimental [1][2][3][4][5][6][7][8][9][10][11][12][13] and theoretical [14][15][16][17][18][19][20][21][22][23] studies. These studies have revealed a range of new phenomena that could not be merely attributed to the anisotropy in the electronic effective mass.…”

Section: Introductionmentioning

confidence: 99%

“…7,10,12,27 For example, multiple-peak structures were recently observed in the magnetization loops of Bi 2 Sr 2 CaCu 2 O 8+y and attributed to phase transitions in the two-component vortex matter composed of pancake and Josephson vortices. 7,10 Similarly, an additional magnetization peak ͑AMP͒ was observed 27 in underdoped La 2−x Sr x CuO 4 ͑LSCO͒ crystals ͑x = 0.05− 0.09͒ in between the well known first and second magnetization peaks. This AMP was attributed to initial flux trapping in the ab plane, followed by flux rotation towards the direction of the external field as the field increases.…”

Section: Introductionmentioning

confidence: 99%

Magnetic flux rotation and associated magnetization peak inLa1.85Sr0.15CuO4crystals under tilted fields

2006

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The magnetization vector in La 1.85 Sr 0.15 CuO 4 was measured as a function of magnetic field, temperature and time for fields tilted from the ab plane. For small tilting angles, the magnetization amplitude curves exhibit an additional peak in between the well-known first and second magnetization peaks. Assessment of the induction vector as a function of field reveals flux rotation from the ab plane towards the direction of the external field, beginning at the onset of the additional magnetization peak. This flux rotation causes a tilt of the current flow plane towards an "easy" direction, namely, the ab plane. The additional peak results from a competition between the current increase associated with this tilt and the intrinsic current decrease associated with the field increase.

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Vortex matter transition inBi2Sr2CaCu2

Cited by 37 publications

References 26 publications

London theory of the crossing vortex lattice in highly anisotropic layered superconductors

London theory of the crossing vortex lattice in highly anisotropic layered superconductors

Phase transitions in isolated vortex chains

Magnetic flux rotation and associated magnetization peak inLa1.85Sr0.15CuO4crystals under tilted fields

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