Muonic study of type II superconductors

Sidorenko, Anna; Smilga, V. P.; Fesenko, Volodymyr I.

doi:10.1007/bf02395984

Cited by 22 publications

(17 citation statements)

References 5 publications

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“…Thus to obtain correct values for λ and ξ , we have to use more sophisticated models. In the case of B B c 2 , Sidorenko et al [8] have been able to analytically calculate the field distribution p(B) from Abrikosov's solution of the Ginzburg-Landau equations. Thus we are able to obtain, together with the experimentally determined value of B c 2 , the penetration depth and the coherence length.…”

mentioning

confidence: 99%

Evidence for a square vortex lattice in from muon-spin-rotation measurements

Aegerter

Lloyd

Ager

et al. 1998

J. Phys.: Condens. Matter

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A muon-spin-rotation study of the flux-line lattice in Sr 2 RuO 4 is presented. For the field parallel to the crystallographic c-direction, the observed field distribution strongly indicates a square symmetry of the vortex lattice. We determine the value of the coherence length from the upper critical field and the Ginzburg-Landau parameter which is found to be κ = 1.2(1) from the field distribution. This gives a value for the penetration depth of λ = 185(15) nm. The temperature dependence of the penetration depth is measured.

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mentioning

confidence: 99%

Evidence for a square vortex lattice in from muon-spin-rotation measurements

Aegerter

Lloyd

Ager

et al. 1998

J. Phys.: Condens. Matter

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“…In this experiment we applied a magnetic field of 9.7 mT at a temperature above the superconducting transition, field cooled down the sample to T = 10 K and measured the field distributions at different positions inside the two YBa 2 Cu 3 O 7−δ layers of the heterostructure. In case of a rather regular vortex lattice one expects an asymmetric field distribution [11] with a maximum at that field value found between two vortex cores (saddle point field B sad ) and a tail to high magnetic field values corresponding to positions close to the vortex core. The saddle point field is shifted diamagnetically from the applied field B 0 , which in our thin film geometry is equal to the first moment of the field distribution.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Magnetism and superconductivity in cuprate heterostructures studied by low energy

Wojek

Morenzoni

Eshchenko

et al. 2009

Physica B: Condensed Matter

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Heterostructures consisting of magnetic and superconducting layers juxtaposed to each other are ideal systems to investigate the interplay of the two order parameters and possible interlayer coupling. We used the low energy muon spin rotation technique to study magnetic field distributions at different implantation depths in tri-layered films composed of 75 nm thick YBa2Cu3O 7−δ layers enclosing a 50 nm thick barrier layer of PrBa2Cu3O7−ε. The PrBa2Cu3O7−ε layer shows the known antiferromagnetic ordering of the Cu and Pr moments, whereas our measurements indicate the formation of a regular vortex lattice in the YBa2Cu3O 7−δ layers if an external field is applied perpendicular to the film.

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“…30,55 In the general case of arbitrary κ and B, the solution is more complicated and various approximations have been suggested. 32,[56][57][58][59][60] A feasible and precise minimization algorithm of the "classical" GL free energy has been suggested by Brandt. 31 The method was first used in the experimental work in Ref.…”

Section: Discussionmentioning

confidence: 99%

Superconducting parameters of BaPt4−xAuxGe12filled

et al. 2012

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We report on a study of the superconducting properties for a series of polycrystalline BaPt 4−x Au x Ge 12 filled skutterudite compounds for x = 0, 0.5, 0.75, and 1. Muon spin rotation (μSR) spectroscopy as well as magnetization, specific-heat, and electrical resistivity measurements were performed. The magnetic penetration depth λ, the coherence length ξ , and the Ginzburg-Landau parameter κ are evaluated. The temperature dependence of the superfluid density is well described by an s-wave superconducting gap and this classical scenario is supported by the field-independent λ. The gap-to-T c ratio 0 /k B T c increases with the Au content from 1.70 for x = 0 to 2.1(1) for x = 1. By combining μSR, magnetization, and specific-heat data, we find that BaPt 4−x Au x Ge 12 compounds are in between the dirty and clean limits with mean free paths of the carriers l ∼ ξ . Interestingly, resistivity data for BaPt 4 Ge 12 indicate a much higher upper critical field, which is probably due to defects or impurities close to the surface of the crystallites.

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Muonic study of type II superconductors

Cited by 22 publications

References 5 publications

Evidence for a square vortex lattice in from muon-spin-rotation measurements

Evidence for a square vortex lattice in from muon-spin-rotation measurements

Magnetism and superconductivity in cuprate heterostructures studied by low energy

Superconducting parameters of BaPt4−xAuxGe12filled

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