Výsledky vyhledávání - "Böhlmann, Winfried"

Akademický článek

Nanometers-Thick Ferromagnetic Surface Produced by Laser Cutting of Diamond

Autor: Setzer, Annette, Esquinazi, Pablo D., Buga, Sergei, Georgieva, Milena T., Reinert, Tilo, Venus, Tom, Estrela-Lopis, Irina, Ivashenko, Andrei, Bondarenko, Maria, Böhlmann, Winfried, Meijer, Jan

In this work, we demonstrate that cutting diamond crystals with a laser (532 nm wavelength, 0.5 mJ energy, 200 ns pulse duration at 15 kHz) produced a ≲20 nm thick surface layer with magnetic order at room temperature. We measured the magnetic mome

Externí odkaz: https://ul.qucosa.de/id/qucosa%3A85733
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Akademický článek

On the Localization of Persistent Currents Due to Trapped Magnetic Flux at the Stacking Faults of Graphite at Room Temperature

Autor: Ariskina, Regina, Stiller, Markus, Precker, Christian E., Böhlmann, Winfried, Esquinazi, Pablo D.

Granular superconductivity at high temperatures in graphite can emerge at certain two-dimensional (2D) stacking faults (SFs) between regions with twisted (around the c-axis) or untwisted crystalline regions with Bernal (ABA…) and/or rhombohedral (A

Externí odkaz: https://ul.qucosa.de/id/qucosa%3A87242
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Akademický článek

Identification of a possible superconducting transition above room temperature in natural graphite crystals

Autor: Precker, Christian E., Esquinazi, Pablo D., Champi, Ana, Barzola-Quiquia, José, Zoraghi, Mahsa, Muinos-Landin, Santiago, Setzer, Annette, Böhlmann, Winfried, Spemann, Daniel, Meijer, Jan, Münster, Tom, Bähre, Oliver, Klöss, Gert, Beth, Henning

Publikováno v: New J. Phys. 18 (2016) 113041 doi:10.1088/1367-2630/18/11/113041

Measuring with high precision the electrical resistance of highly ordered natural graphite samples from a Brazil mine, we have identified a transition at ∼350 K with ∼40 K transition width. The steplike change in temperature of the resistance, it

Externí odkaz: https://ul.qucosa.de/id/qucosa%3A15182
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Nanometers-thick Ferromagnetic Surface Produced by Laser Cutting of Diamond

In this work, we demonstrate that cutting diamond crystals with a laser (532~nm wavelength, 0.5~mJ energy, 200~ns pulse duration at 15~kHz) produces a $\lesssim 20~$nm thick surface layer with magnetic order at room temperature. We have measured the

Externí odkaz: http://arxiv.org/abs/2112.03671

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Evidence for room temperature superconductivity at graphite interfaces

Autor: Esquinazi, Pablo D., Precker, Christian E., Stiller, Markus, Cordeiro, Tiago R. S., Barzola-Quiquia, Jose, Setzer, Annette, Böhlmann, Winfried

Publikováno v: Quantum Studies: Mathematics and Foundations 1-13 (2017)

In the last 43 years several hints were reported suggesting the existence of granular superconductivity above room temperature in different graphite-based systems. In this paper some of the results are reviewed, giving special attention to those obta

Externí odkaz: http://arxiv.org/abs/1709.00259

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Akademický článek

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Granular superconductivity below 5~K in SPI-II pyrolytic graphite

Autor: Ballestar, Ana, Esquinazi, Pablo, Böhlmann, Winfried

We have studied the transport properties of transmission electron microscope (TEM) lamellae obtained from a pyrolytic graphite sample of grade B (SPI-II) with electrical contacts at the edges of the graphene layers. The temperature, magnetic field, i

Externí odkaz: http://arxiv.org/abs/1412.8573

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