Effects of Hydrostatic Pressure on Critical Current Density & Pinning Mechanism of Iron Based Superconductors and MgB2

The iron based superconductors have revealed distinctive superconducting properties, including reasonable critical temperature (Tc ≈ 56 K), extremely high upper critical field (Hc2) on the order of 100 T, high intrinsic pinning potential, low anisotropy values, generally between 1-8, high irreversibility field (Hirr), and high critical current density (Jc), which is of vital importance for low and high field application. Enhancement of Jc or flux pinning has always been an important focus of superconductor research over the past decade

Long Range Intrinsic Ferromagnetism in Two Dimensional Materials and Dissipationless Future Technologies

The inherent susceptibility of low-dimensional materials to thermal fluctuations has long been expected to poses a major challenge to achieving intrinsic long-range ferromagnetic order in two-dimensional materials. The recent explosion of interest in atomically thin materials and their assembly into van der Waals heterostructures has renewed interest in two-dimensional ferromagnetism, which is interesting from a fundamental scientific point of view and also offers a missing ingredient necessary for the realization of spintronic functionality in van der Waals heterostructures. Recently several atomically thin materials have been shown to be robust ferromagnets. Such ferromagnetism is thought to be enabled by magneto crystalline anisotropy which suppresses thermal fluctuations. In this article, we review recent progress in two-dimensional ferromagnetism in detail and predict new possible two-dimensional ferromagnetic materials. We also discuss the prospects for applications of atomically thin ferromagnets in novel dissipationless electronics, spintronics, and other conventional magnetic technologies. Particularly atomically thin ferromagnets are promising to realize time reversal symmetry breaking in two-dimensional topological systems, providing a platform for electronic devices based on the quantum anomalous Hall Effect showing dissipationless transport. Our proposed directions will assist the scientific community to explore novel two-dimensional ferromagnetic families which can spawn new technologies and further improve the fundamental understanding of this fascinating area.Comment: To be appear in Applied Physics Review

A szerencsejáték-kötvénybefektetések sorsolás utáni hatása a nemesfémhozamokra

A tanulmány célja, hogy tesztelje, milyen hatással van a pakisztáni szerencsejáték-kötvények piacáról az arany- és ezüstpiacra irányuló pénzáramlás az ilyen kötvények sorsolásakor. Az elemzéshez kiválasztott adatok 2007 júliusa és 2019 júniusa közöttiek, és magukban foglalják az arany- és ezüstpiacok hozamait. Az adatokat eseménytanulmánnyal teszteltük, és AR-, AAR- és CAR-számítások is készültek. Az AR- és a CAR-számítások nem támasztották alá azt a két hipotézist, amelyek azon alapultak, hogy jelentős értékeket találtak mind a sorsolás előtti, mind a sorsolás utáni adatokban, annak érdekében, hogy ki lehessen zárni a szerencsejáték-kötvények piacáról az arany és az ezüst piacára történő pénzáramlás hatását. Az AAR-eredmények pedig ekként jelentéktelenek voltak, így megerősítve mindkét hipotézis elvetését. Így, a kutatás eredményei egyik hipotézist sem igazolták, melyek szerint a szerencsejáték-kötvények sorsolási napjain különböznek a hozamok az arany- és az ezüstpiacon. Bár az eredmények nem igazolták a hipotéziseket, a megállapítások alapján a jogalkotók számára javasolható, hogy megfelelő és átlátható dokumentációval több pénzre lehetne szert tenni ebből a viszonylag olcsó forrásból, ami tisztábbá tenné a gazdaságot

Post Draw Effects of Prize Bonds’ Investment on Bullion Returns

The study was conducted with the view to test the impact of cash out flow from the Pakistan Prize Bond market to Gold and Silver markets as a result of the bonds’ draw. The data from July 2007 to June 2019 was selected, which included Returns of Gold and Silver Markets. The data was tested with Event Study and AR, AAR & CAR were calculated. The results of AR & CAR did not endorse both the hypotheses on the basis that significant readings were found both in pre and post draw dates, to rule out any impact of cash flow from Prize Bond market into Gold and Silver markets. Whereas, AAR results were insignificant as such, hence fortifying the inference of rejection of both the hypotheses. So, both the hypotheses of having different returns on prize bond draw dates in Gold and Silver markets were not supported. Though the results were incongruent with the hypotheses, yet study outcomes as such are significant enough to propose regulators to contemplate legislations to fetch more funds from this comparatively cheaper source through enhanced documentation, which ultimately would make the economy more compliant