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Regular version of the site

Seminar on ' Vortex Patterns in Intertype Superconductivity Regime in Thin and Nanowire Superconductors '

Event ended

On January 22 a joint research seminar of the School of Electronic Engineering and the Quantum Nanoelectronics Laboratory will be held at HSE.

Speaker: Cordoba-Camacho Wilmer Yesid

Title: Vortex patterns in Intertype Superconductivity Regime in thin and nanowire superconductors

Venue: Room 403, 34 Talinskaya str., MIEM HSE building

Time: 15:10–16:30

Working language: English

Abstract:
Based on the Ginzburg-Landau theory, superconducting materials are classified as ideally diamagnetic type-I or type-II, where the magnetic field penetrates the superconducting condensate as a regular lattice of Abrikosov single-quantum vortices, depending on the Ginzburg-Landau parameter k. However, this simple classification applies only for materials deep in type-I (k< 1/√2) or in deep type-II (k< 1/√2). Superconducting materials with k in the vicinity of  k≈ 1/√2 reveals non-standard properties that cannot be described within the conventional type-I/type-II dichotomy. These materials are broadly referred as presenting intertype (IT) superconductivity.  The existence of the IT superconductivity is a general property of the BCS pairing mechanism and is related to the infinite degeneracy of the Bogomolnyi point. By lowering the temperature or introducing impurities and/or defects this degeneracy is removed, leading to many unconventional properties of the superconducting mixed state, which are characteristic to the IT superconductivity. The magnetic properties of IT superconductivity cannot be described as a mixture of those in type-I or -II superconductors. In this seminar the results on the vortex patterns in the IT regime will be presented. In particular, it will be shown that the superconducting state of a type-I thin film and nanowire undergoes more complex transformation, depending on the thickness. It will be also disscussed the physics behind these vortex configurations and futures works within this framework of intertype superconductivity.

For all questions please contact Elena Kazakova (eakazakova@hse.ru), tel. 8 (495) 772-95-90 *15207