Patterns close to the critical field in type-I superconductors

Menghini, Mariela; Wijngaarden, Rinke J.

doi:10.1103/physrevb.75.014529

Cited by 15 publications

(17 citation statements)

References 24 publications

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“…In more disordered samples with significant bulk pinning, a non-equilibrium dendrite -like topology of the intermediate state is observed [14]. Recently, it was shown that close to H c laminar structure transforms into tubular upon applying a small-amplitude AC field to shake it out of the metastable state [10]. Fortunately, it is easy to distinguish between pinning-induced and topological hysteresis.…”

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confidence: 99%

Equilibrium Topology of the Intermediate State in Type-I Superconductors of Different Shapes

Prozorov

2007

Phys. Rev. Lett.

128

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High-resolution magneto-optical technique was used to analyze flux patterns in the intermediate state of bulk Pb samples of various shapes -cones, hemispheres and discs. Combined with the measurements of macroscopic magnetization these results allowed studying the effect of bulk pinning and geometric barrier on the equilibrium structure of the intermediate state. Zero-bulk pinning discs and slabs show hysteretic behavior due to topological hysteresis -flux tubes on penetration and lamellae on flux exit. (Hemi)spheres and cones do not have geometric barrier and show no hysteresis with flux tubes dominating the intermediate field region in both regimes. It is concluded that flux tubes represent the equilibrium topology of the intermediate state and that the laminar structure is unstable towards Lorentz or condensation energy forces. Real-time video is available in [24].

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confidence: 99%

Equilibrium Topology of the Intermediate State in Type-I Superconductors of Different Shapes

Prozorov

2007

Phys. Rev. Lett.

128

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“…77 In contrast to this behavior, upon field-cooling from the normal state in a perpendicular magnetic field, a laminar pattern is formed initially except at low fields. Field-shaking experiments, however, show that the laminae that are formed upon field-cooling in high fields transform into arrays of superconducting tubes, 17 showing that the latter structure is the equilibrium state.…”

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confidence: 99%

“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. For further background we refer the reader to several books and reviews.…”

Section: Introductionmentioning

confidence: 99%

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Equilibrium intermediate-state patterns in a type-I superconducting slab in an arbitrarily oriented applied magnetic field

Clem

Prozorov²,

Wijngaarden³

2013

Phys. Rev. B

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The equilibrium topology of superconducting and normal domains in flat type-I superconductors is investigated. Important improvements with respect to previous work are: (1) the energy of the external magnetic field, as deformed by the presence of superconducting domains, is calculated in the same way for three different topologies, and (2) calculations are made for arbitrary orientation of the applied field. A phase diagram is presented for the minimum-energy topology as a function of applied field magnitude and angle. For small (large) applied fields normal (superconducting) tubes are found, while for intermediate fields parallel domains have a lower energy. The range of field magnitudes for which the superconducting-tubes structure is favored shrinks when the field is more in-plane oriented.

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“…The properties of type-I superconductors have been studied, both theoretically and experimentally, for nearly one century [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Historically, the presence of irreversible phenomena in the magnetic hysteresis cycle had been associated to physical or chemical defects such as dislocations or impurities [2].…”

Section: Introductionmentioning

confidence: 99%

Magnetic field dependence of the quantum tunneling of normal-superconductor interfaces in a type-I Pb superconductor

Vélez¹,

Zarzuela²,

García-Santiago³

et al. 2012

Phys. Rev. B

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We report experimental evidence of the effect of an applied magnetic field on the non-thermal magnetic relaxation in a disk-shaped type-I lead superconductor. The time evolution of the irreversible magnetization proves to be logarithmic for a wide range of temperatures and magnetic field values along the descending branch of the hysteresis cycle. When the intensity of the magnetic field increases, the crossover temperature separating the thermal and non-thermal regimes of magnetic relaxation is found to decrease, whereas the rate at which such relaxation occurs is observed to increase. These results are discussed in the framework of a recent model for quantum tunneling of normal-superconductor interfaces through the distribution of pinning energy barriers generated by structural defects in the sample, considering that the strength of the barriers decreases with the magnetic field. A phase diagram describing the dynamics of interfaces during flux expulsion in the intermediate state as a function of temperature and magnetic field is constructed.

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Patterns close to the critical field in type-I superconductors

Cited by 15 publications

References 24 publications

Equilibrium Topology of the Intermediate State in Type-I Superconductors of Different Shapes

Equilibrium Topology of the Intermediate State in Type-I Superconductors of Different Shapes

Equilibrium intermediate-state patterns in a type-I superconducting slab in an arbitrarily oriented applied magnetic field

Magnetic field dependence of the quantum tunneling of normal-superconductor interfaces in a type-I Pb superconductor

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