Nonlocal effect and dimensions of Cooper pairs measured by low-energy muons and polarized neutrons in type-I superconductors

Кожевников, В. Л.; Suter, A.; Fritzsche, H.; Gladilin, V. N.; Volodin, A.; Moorkens, T.; Trekels, Maarten; Cuppens, J.; Wojek, Bastian M.; Prokscha, T.; Morenzoni, E.; Nieuwenhuys, G.J.; Bael, M. J. Van; Temst, Kristiaan; Haesendonck, C. Van; Indekeu, Joseph

doi:10.1103/physrevb.87.104508

Cited by 17 publications

(17 citation statements)

References 30 publications

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“…Similar to our other indium samples (see Refs. [12,21]), the data on H c of the In-A When analyzing the graphs for the magnetic moment in perpendicular field (Figs. 4 and 5), we first note that the graphs meet the rule of 1/2: The area under the straight (green) line for all these graphs equals 1/2 with an error 3%.…”

Section: Magnetic Moment Of a Slab: Experimentsmentioning

confidence: 99%

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Magnetic moment of a slab of type-I superconductor: Theoretical model and experiment

Кожевников

Haesendonck

2014

Phys. Rev. B

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The magnetic moment M of superconducting samples with a nonzero demagnetizing factor is one of the most important but not always completely understood sample characteristics. Here we calculate the magnetic moment of a slab of type-I superconductor in an arbitrarily oriented magnetic field, applying a recently developed model of the intermediate state (IS) [V. Kozhevnikov et al., Phys. Rev. B 89, 100503(R) (2014)]. We introduce and employ a novel form of the thermodynamic potential, which allows us to derive a general formula for the total free energy of the slab. The magnetic moment, calculated from the total free energy, is consistent with experimental data reported in this paper as well as with data available in the literature. Also, the calculated moment solves a long-standing puzzle of experimental M(H ) curves (H is the applied field) and provides insight in the field driven evolution of the magnetic flux density in the domain structure of the IS. This paper completes our presentation of a theoretical model which consistently addresses all properties of the IS, thus solving the problem of the IS in a slab that was put forward by Landau almost eight decades ago.

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Section: Magnetic Moment Of a Slab: Experimentsmentioning

confidence: 99%

“…The surface of these films consists of nearly atomically flat terraces [21], resulting in a significant degree of specular reflection of electrons at the surface. Owing to that, the mean free path of the electrons can become very large, exceeding the film thickness.…”

Section: Magnetic Moment Of a Slab: Experimentsmentioning

confidence: 99%

Magnetic moment of a slab of type-I superconductor: Theoretical model and experiment

Кожевников

Haesendonck

2014

Phys. Rev. B

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“…LE- µ SR is an unique and powerful technique to measure non-trivial B ( z ) on a nanometer scale in a wide variety of superconducting single crystals18, thin films1920, and heterostructures2122, allowing also the observation of non-local effects232425. Positively charged muons are slowed down and implanted into the samples at different mean implantation depths (Figs.…”

Section: Resultsmentioning

confidence: 99%

Controlling the near-surface superfluid density in underdoped YBa2Cu3O6+x by photo-illumination

Stilp

Suter

Prokscha

et al. 2014

Sci Rep

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The interaction with light weakens the superconducting ground state in classical superconductors. The situation in cuprate superconductors is more complicated: illumination increases the charge carrier density, a photo-induced effect that persists below room temperature. Furthermore, systematic investigations in underdoped YBa2Cu3O6+x (YBCO) have shown an enhanced critical temperature Tc. Until now, studies of photo-persistent conductivity (PPC) have been limited to investigations of structural and transport properties, as well as the onset of superconductivity. Here we show how changes in the magnetic screening profile of YBCO in the Meissner state due to PPC can be determined on a nanometer scale utilizing low-energy muons. The data obtained reveal a strongly increased superfluid density within the first few tens of nanometers from the sample surface. Our findings suggest a non-trivial modification of the near-surface band structure and give direct evidence that the superfluid density of YBCO can be controlled by light illumination.

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“…Meissner state [37]. In Figure 11 we reproduce typical magneto-optical images obtained for a 2.5-μm-thick film.…”

Section: Superfluids and Superconductors 100mentioning

confidence: 89%

Intermediate State in Type-I Superconductors

Кожевников¹

2018

Superfluids and Superconductors

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Nonlocal effect and dimensions of Cooper pairs measured by low-energy muons and polarized neutrons in type-I superconductors

Cited by 17 publications

References 30 publications

Magnetic moment of a slab of type-I superconductor: Theoretical model and experiment

Magnetic moment of a slab of type-I superconductor: Theoretical model and experiment

Controlling the near-surface superfluid density in underdoped YBa2Cu3O6+x by photo-illumination

Intermediate State in Type-I Superconductors

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