A Mini Review on Thin Film Superconductors

Sibanda, David; Oyinbo, Sunday Temitope; Jen, Tien‐Chien; Ibitoye, Ayotunde Idris

doi:10.3390/pr10061184

Cited by 6 publications

(3 citation statements)

References 210 publications

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“…Future work on PME will consider very thin films of metallic superconductors, where significant progress has been made to fabricate uniform atomic monolayer films of Pb, Nb, Al, V, and MgB 2 [175,[178][179][180][181][182]. Giant PME may appear from non-monotonic vortex interactions as predicted in [174].…”

Section: Discussionmentioning

confidence: 99%

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Koblischka

Půst

Chang

et al. 2023

Metals

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The experimental data in the literature concerning the Paramagnetic Meissner Effect (PME) or also called Wohlleben effect are reviewed with the emphasis on the PME exhibited by metallic, s-wave superconductors. The PME was observed in field-cool cooling (FC-C) and field-cool warming (FC-W) m(T)-measurements on Al, Nb, Pb, Ta, in compounds such as, e.g., NbSe2, In-Sn, ZrB12, and others, and also in MgB2, the metallic superconductor with the highest transition temperature. Furthermore, samples with different shapes such as crystals, polycrystals, thin films, bi- and multilayers, nanocomposites, nanowires, mesoscopic objects, and porous materials exhibited the PME. The characteristic features of the PME, found mainly in Nb disks, such as the characteristic temperatures T1 and Tp and the apparative details of the various magnetic measurement techniques applied to observe the PME, are discussed. We also show that PME can be observed with the magnetic field applied parallel and perpendicular to the sample surface, that PME can be removed by abrading the sample surface, and that PME can be introduced or enhanced by irradiation processes. The PME can be observed as well in magnetization loops (MHLs, m(H)) in a narrow temperature window Tp<Tc, which enables the construction of a phase diagram for a superconducting sample exhibiting the PME. We found that the Nb disks still exhibit the PME after more than 20 years, and we present the efforts of magnetic imaging techniques (scanning SQUID microscopy, magneto-optics, diamond nitrogen-vacancy (NV)-center magnetometry, and low-energy muon spin spectroscopy, (LE-μSR)). Various attempts to explain PME behavior are discussed in detail. In particular, magnetic measurements of mesoscopic Al disks brought out important details employing the models of a giant vortex state and flux compression. Thus, we consider these approaches and demagnetization effects as the base to understand the formation of the paramagnetic signals in most of the materials investigated. New developments and novel directions for further experimental and theoretical analysis are also outlined.

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Section: Discussionmentioning

confidence: 99%

The Paramagnetic Meissner Effect (PME) in Metallic Superconductors

Koblischka

Půst

Chang

et al. 2023

Metals

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“…Тонкие пленки металлов благодаря их свойствам находят широкое применение в приборах и устройствах фотоники, оптоэлектроники, микро-и сверхпроводящей электроники, квантовых компьютерах [1][2][3][4][5]. Состав пленок, а также их микроструктура, морфология поверхности и шероховатость межслойных границ во многом определяют оптические, электрические и магнитные свойства создаваемых структур на их основе [6][7][8][9][10]. Получение монокристаллических металлических пленок с атомарно-гладкими поверхностями является одним из приоритетных направлений развития ростовых технологий.…”

Section: Introductionunclassified

Влияние гомобуферного слоя на морфологию, микроструктуру и твердость пленок Al/Si(111)

Ломов,

Захаров,

Тарасов

et al. 2023

Журнал Технической Физики

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The results of complementary studies of Al films grown by magnetron sputtering at room temperature are presented. The films were obtained on standard Si(111) silicon substrates without and with a ~20 nm aluminum (homobuffer) layer preliminarily grown on their surface at 400°C. The interdependence of the morphology, microstructure, and hardness of Al films on the state of the substrate surface was studied by the HRXRR, XRD, SEM, EDS, AFM, and Nano Indenter (ASTM) methods. It is shown that the formation of homobuffer layers on the substrate surface makes it possible to control the structural and mechanical properties of thin aluminum films.

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“…This includes nanosystems, such as, e.g., very thin films [ 1 ], tunnel–junction-based hybrid devices [ 2 ], superconductors with nanospaced defects or vortex pinning centers [ 3 ], interfacial superconductivity [ 4 ], etc.…”

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confidence: 99%