Paramagnetic Meissner effect from the self-consistent solution of the Ginzburg-Landau equations

Moshchalkov, Victor; Qiu, Xin; Bruyndoncx, V.

doi:10.1103/physrevb.55.11793

Cited by 195 publications

(215 citation statements)

References 28 publications

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“…The measured superconducting phase boundary T c ͑H͒ is in good agreement with the T c ͑H͒ line found from the LGLE. The superconducting state in microcylinders and disks in an applied magnetic field nucleates in the form of the giant vortex state (GVS) [1][2][3][4]. The phase boundary in the H-T plane [critical temperature vs field T c ͑H͒] shows oscillations corresponding to the cusplike T c ͑H͒ line formed by the states with different orbital quantum numbers.…”

Section: (Received 24 July 2000)mentioning

confidence: 99%

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Vortex Entry and Nucleation of Antivortices in a Mesoscopic Superconducting Triangle

et al. 2001

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The nucleation of superconductivity in mesoscopic equilateral triangles is investigated by using the linearized Ginzburg-Landau equation (LGLE). The trigonal symmetry of the sample has a profound effect on the superconducting state in the presence of a magnetic field H leading, in particular, to the formation of antivortices in symmetry-consistent states. For the same given irreducible representation, vortices enter always by three via the middle of the edges, approach the center, and then are dispatched towards the corners of the triangle. The measured superconducting phase boundary T c ͑H͒ is in good agreement with the T c ͑H͒ line found from the LGLE.

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Section: (Received 24 July 2000)mentioning

confidence: 99%

“…1a) and increases by 1 upon each transition to the next ground state. In the case of a disk the vorticity is just the orbital quantum number, L, defining the flux, LF 0 , carried by the GVS [1,3]. Therefore in a disk, the symmetry-consistent solutions of the LGLE will correspond to the GVS (L .…”

Section: (Received 24 July 2000)mentioning

confidence: 99%

Vortex Entry and Nucleation of Antivortices in a Mesoscopic Superconducting Triangle

et al. 2001

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“…Thus alternative models based on flux trapping and compression effects by Lorentz forces were proposed by different authors. 10,11 An inhomogeneous superconducting transition can be the origin of flux compression. If the edges of the sample become superconducting first, vortices will be excluded from this region.…”

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confidence: 99%

Paramagnetic Meissner effect inYBa2Cu3O7∕La0.7
Torre
¹
,
Peña
²
,
Sefrioui
³

et al. 2006
Phys. Rev. B
34
3
17
1
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We report the observation of a paramagnetic contribution to the field cooled magnetization that develops below the superconducting transition temperature T c in measurements performed on YBa 2 Cu 3 O 7 /La 0.7 Ca 0.3 MnO 3 superlattices. The effect has been detected only for samples whose manganite layers are magnetically granular. We discuss our observation of this paramagnetic Meissner effect ͑Wohlleben effect͒ in terms of an inhomogeneous superconducting state at the interface with the magnetically granular manganite layers. DOI: 10.1103/PhysRevB.73.052503 PACS number͑s͒: 74.78.Fk, 74.72.Bk, 75.70.Cn A positive field cooled magnetization developing below T c , the so-called paramagnetic Meissner or Wohlleben effect, has been occasionally observed in some superconducting samples. [1][2][3] As it was first found in high-T c superconductors, an explanation was proposed which considered the existence of an unconventional d-wave pairing state leading to the appearance of spontaneous supercurrents in the superconductor due to the presence of " boundaries", 4,5 which give rise to a paramagnetic contribution to the susceptibility. Following this interpretation, the samples showing a paramagnetic Meissner effect ͑PME͒ would consist of a network of Josephson junctions formed at weak links between superconducting grains. The spontaneous orbital supercurrents, which are responsible for the onset of a paramagnetic magnetization below T c ͑Ref. 6͒, are a consequence of the symmetry of the superconducting pairing. 4 Nevertheless, the observation of this effect in different types of niobium samples and Josephson junctions 3,7-9 implies that it is not necessarily linked to an unconventional mechanism for superconductivity. Thus alternative models based on flux trapping and compression effects by Lorentz forces were proposed by different authors. 10,11 An inhomogeneous superconducting transition can be the origin of flux compression. If the edges of the sample become superconducting first, vortices will be excluded from this region. On field cooling, the flux-free region expands, resulting in further flux compression. Once the whole sample becomes superconducting, the compressed flux state gives rise to a paramagnetic signal. Nevertheless, theoretical arguments have been put forward suggesting that flux compression is not essential for the existence of PME. 12 Thus at present there is no agreement about the origin of this effect. It is worth pointing out that, although the PME appears only in a few samples, a strong sensitivity to the surface microstructure has been reported in every case. 3,13 This suggests that vortex pinning by surface defects, an important source of flux pinning in high-T c single crystals 14 and epitaxial thin films, must play a significant role in the development of PME.In this work we report the observation of a paramagnetic Meissner effect in YBa 2 Cu 3 O 7 /La 0.7 Ca 0.3 MnO 3 ͑YBCO/ LCMO͒ superlattices. The possible correlation of this behavior with the magnetic state of the manganite layers will...

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“…In nanoscopic superconducting samples, controlling the vortex behavior is essential for the development of new devices based on fluxon dynamics [2]. The confinement of Cooper pairs to the length scales comparable to the correlation length also offers the prospect to probe fundamentally new phase topologies predicted by the theory, such as giant [3,4] and ring-like vortices [5]. This has led to renewed experimental efforts to observe giant vortex states, both in superconductors [6,7] and in superfluid atomic gases [8].…”

Section: Introductionmentioning

confidence: 99%

Vortices on a superconducting nanoshell: Phase diagram and dynamics

et al. 2008

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In superconductors, the search for special vortex states such as giant vortices focuses on laterally confined or nanopatterned thin superconducting films, disks, rings, or polygons. We examine the possibility to realize giant vortex states and states with non-uniform vorticity on a superconducting spherical nanoshell, due to the interplay of the topology and the applied magnetic field. We derive the phase diagram and identify where, as a function of the applied magnetic field, the shell thickness and the shell radius, these different vortex phases occur. Moreover, the curved geometry allows these states (or a vortex lattice) to coexist with a Meissner state, on the same curved film. We have examined the dynamics of the decay of giant vortices or states with non-uniform vorticity into a vortex lattice, when the magnetic field is adapted so that a phase boundary is crossed.PACS numbers: PACS 1 arXiv:0709.0463v1 [cond-mat.supr-con]

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Paramagnetic Meissner effect from the self-consistent solution of the Ginzburg-Landau equations

Cited by 195 publications

References 28 publications

Vortex Entry and Nucleation of Antivortices in a Mesoscopic Superconducting Triangle

Vortex Entry and Nucleation of Antivortices in a Mesoscopic Superconducting Triangle

Paramagnetic Meissner effect inYBa2Cu3O7∕La0.7
Torre
¹
,
Peña
²
,
Sefrioui
³

et al. 2006
Phys. Rev. B
34
3
17
1
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Vortices on a superconducting nanoshell: Phase diagram and dynamics

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Paramagnetic Meissner effect from the self-consistent solution of the Ginzburg-Landau equations

Cited by 195 publications

References 28 publications

Vortex Entry and Nucleation of Antivortices in a Mesoscopic Superconducting Triangle

Vortex Entry and Nucleation of Antivortices in a Mesoscopic Superconducting Triangle

Paramagnetic Meissner effect inYBa2Cu3O7∕La0.7Torre1, Peña2, Sefrioui3 et al. 2006Phys. Rev. B343171View full textAdd to dashboardCite

Vortices on a superconducting nanoshell: Phase diagram and dynamics

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Paramagnetic Meissner effect inYBa2Cu3O7∕La0.7
Torre
¹
,
Peña
²
,
Sefrioui
³

et al. 2006
Phys. Rev. B
34
3
17
1
View full text Add to dashboard Cite