Onset of superconductivity in decreasing fields

Saint‐James, D.; Gennes, P. G. de

doi:10.1016/0031-9163(63)90047-7

Cited by 825 publications

(304 citation statements)

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“…21 The ratio H c3 /H c2 is calculated as 1.71, which is very close to the predicted value 1.695. 22 Similar behavior is observed in the critical fields for H⊥c and H c in stage-1 K GIC (KC 8 ). 23 The coherence length ξ is estimated as ξ = 820Å from the value of H c2 using the relation H c2 = Φ 0 /(2πξ 2 ), where Φ 0 (= 2.0678 × 10 −7 Gauss cm 2 ) is a fluxoid.…”

Section: A Meissner Effect Due To Bi Nanoparticlessupporting

confidence: 64%

Magnetic-field-induced superconductor–metal-insulator transitions in bismuth metal graphite

Suzuki

Lee

et al. 2002

Phys. Rev. B

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Bismuth-metal graphite (MG) has a unique layered structure where Bi nanoparticles are encapsulated between adjacent sheets of nanographites. The superconductivity below Tc (= 2.48 K) is due to Bi nanoparticles. The Curie-like susceptibility below 30 K is due to conduction electrons localized near zigzag edges of nanographites. A magnetic-field induced transition from metallic to semiconductor-like phase is observed in the in-plane resistivity ρa around Hc (≈ 25 kOe) for both H⊥c and H c (c: c axis). A negative magnetoresistance in ρa for H⊥c (0< H ≤3.5 kOe) and a logarithmic divergence in ρa with decreasing temperature for H c (H > 40 kOe) suggest the occurrence of two-dimensional weak localization effect.

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Section: A Meissner Effect Due To Bi Nanoparticlessupporting

confidence: 64%

Magnetic-field-induced superconductor–metal-insulator transitions in bismuth metal graphite

Suzuki

Lee

et al. 2002

Phys. Rev. B

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“…II that the most outstanding feature obtained in our results can be related to the condition for the formation of vortices in a slab parallel to the magnetic field. 23,24,25,26 If the coherence length is larger than 0.55 times the width of the slab, then vortices cannot be present in the slab, whereas for smaller coherence lengths they can. This change of regime is accompanied by a change of behavior of the temperature-field dependence along the normal-superconducting (N-S) phase boundary.…”

Section: Introductionmentioning

confidence: 99%

Flux transitions in a superconducting ring

Berger

2003

Phys. Rev. B

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We consider a superconducting ring embedded in a magnetic field. The magnetic field is initially too high to support a superconducting state, but is ideally slowly decreased and then reversed. During this process, the number of fluxoids trapped by the ring exhibits a complex pattern of transitions, which depends qualitatively on the ratios of the geometric dimensions of the ring to the coherence length. We evaluate the current around the ring and find rough agreement with experiments. However, we also predict a new feature that has not shown up in experiments: in the vicinity of a critical field, giant jumps are expected.

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“…Here we interpret the experimental results by estimating H c ͑⌰͒ within the simplest variation of the GL model, [20][21][22]41 taking account of the real symmetry of the multilayers.…”

Section: Discussionmentioning

confidence: 94%

“…22 At large sample thickness the nucleation starts apart from the center and reaches the familiar surface superconductivity situation. 20,24 The layered structure of superconducting and nonsuperconducting films of finite thickness creates additional diffi-culties for understanding of the angular dependences of the upper critical magnetic field. For example, in S/N multilayers in 2D mode ͓according to the temperature dependence of the parallel critical magnetic field, H c ͑T , ⌰ =0͔͒ the H c ͑⌰͒ points fall faster with angle growth with respect to Tinkham's expression ͑2͒ for thin films.…”

Section: H Cmentioning

confidence: 99%

“…The fundamental results concerning the H c ͑⌰͒ dependences in homogeneous superconductors were obtained on the basis of the Ginzburg-Landau ͑GL͒ theory. [20][21][22][23] For infinite anisotropic superconductors the dependence H c ͑⌰͒ is a smooth curve in the whole ⌰ range ͑including ⌰ =0͒. This curve is easily reproduced within the anisotropic effective mass GL theory: 23 …”

Section: Introductionmentioning

confidence: 99%

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Effect of geometrical symmetry on the angular dependence of the critical magnetic field in superconductor/normal metal multilayers

et al. 2005

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The angular dependence of the upper critical field, H c ͑⌰͒, for Nb/ Pd multilayers with different geometrical symmetries ͑i.e., with an even or an odd number of bilayers, N bil ͒ and thickness of Nb and Pd layers of the order of superconducting coherence length were investigated ͑the angle ⌰ is here defined from the plane parallel to the sample surface͒. The presence of an angular dimensional crossover at some temperature dependent angle ⌰ * ͑T͒ was established. At angles ⌰Ͻ⌰ * ͑T͒ the multilayers are in two-dimensional mode while at ⌰Ͼ⌰ * ͑T͒ they are in a three-dimensional one. In addition, the sample with odd N bil has a larger value of ⌰ * ͑T͒ with respect to the sample with even N bil . The experimental results have been qualitatively explained in the framework of the Ginzburg-Landau theory. It was shown that the main features of the H c ͑⌰͒ dependences in samples with even and odd N bil values are related to the different localizations of the superconducting order parameter.

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Onset of superconductivity in decreasing fields

Cited by 825 publications

References 1 publication

Magnetic-field-induced superconductor–metal-insulator transitions in bismuth metal graphite

Magnetic-field-induced superconductor–metal-insulator transitions in bismuth metal graphite

Flux transitions in a superconducting ring

Effect of geometrical symmetry on the angular dependence of the critical magnetic field in superconductor/normal metal multilayers

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