Dynamics of trapped magnetic fluxes in single-crystal YBCO in weak fields

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The magnetic moment in the superconducting and normal state of a crystalline FeTe 0.65 Se 0.35 superconductor, grown by the Bridgman's method with relatively high growth rate, was measured. The temperature and magnetic field dependences of magnetization and its relaxation time were determined. Studied crystal, being non-uniform due to high growth rate of 5 mm/h, exhibits smaller width of superconducting transition in comparison with an ideal crystal grown with velocity of 1 mm/h, and the difference in magnetic properties of crystals grown with various growth rate, related to their microstructure, is discussed.

Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamics of trapped magnetic flux in superconducting FeTe0.65Se0.35

Бондаренко

Bludov

Koverya

et al. 2017

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Violation of a logarithmic trend of magnetization relaxation in HTSCs with strong pinning centers

Monarkha

Timofeev

Shablo

2012

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The dynamics of magnetic fluxes trapped in small constant magnetic fields, of the order of the Earth’s field, were experimentally investigated in single crystals of YBCO with strong pinning centers formed in the structure of unidirectional twinning boundaries. A significant deviation of the isothermal magnetization relaxation from the logarithmic behavior observed previously only in strong magnetic fields was found for the first time in the region of strong thermal fluctuations near the superconducting phase transition. Within the Anderson-Kim linear model of the thermally activated creep and using experimental data, an effective pinning potential was estimated. It is shown that at the temperatures close to critical one the inverse logarithmic model of Zeldov describes better the magnetization drop, in particular, at long measurements times.

Pinning features of the magnetic flux trapped by YBCO single crystals in weak constant magnetic fields

Monarkha

Paschenko

Timofeev

2013

The dynamics of Abrikosov vortices and their bundles was experimentally investigated in weak constant magnetic fields, in the range of Earth's magnetic field. Characteristics of the isothermal magnetization relaxation in YBCO single-crystal samples with strong pinning centers were studied for different sample-field orientation. The obtained values of normalized relaxation rate S allowed us to estimate the effective pinning potential U in the bulk of the YBCO sample and its temperature dependence, as well as the critical current density Jc. A comparison between the data obtained and the results of similar measurements in significantly higher magnetic fields was performed. To compare different techniques for evaluation of Jc, the magnetization loop measurements M(H), which relate the loop width to the critical current, were carried out. These measurements provided important parameters of the samples under study (penetration field Hp and first critical field Hc1), which involve the geometrical configuration of the samples.