Unconventional critical behavior of magnetic susceptibility as a consequence of phase separation and cluster formation in La₀.₇Ca₀.₃MnO₃ thin films

Nonuniversal critical behavior of the dc magnetic susceptibility is observed near the paramagnetic to ferromagnetic transition in La₀.₇Ca₀.₃MnO₃ film samplesyesBelgorod State Universit

Observation of Spin-glass-like Behavior in SrRuO3 Epitaxial Thin Films

We report the observation of spin-glass-like behavior and strong magnetic anisotropy in extremely smooth (~1-3 \AA) roughness) epitaxial (110) and (010) SrRuO3 thin films. The easy axis of magnetization is always perpendicular to the plane of the film (unidirectional) irrespective of crystallographic orientation. An attempt has been made to understand the nature and origin of spin-glass behavior, which fits well with Heisenberg model.Comment: 5 pages, 5 Figure

Muotibloggaajan metamorfooseja:elämäjulkaiseminen Anna-Kaari Hakkaraisen romaanissa Kristallipalatsi ja sosiaalista mediaa käsittelevässä suomalaisessa proosassa vuosina 2000–2017

Tiivistelmä. Sosiaalinen media on 2000-luvun alun näkyvimpiä digitalisaation ilmenemismuotoja. Sitä ei kuitenkaan ole tarkasteltu aiemmin kirjallisuustieteelliseltä kannalta suomalaisen fiktion elementtinä. Tässä kirjallisuuden sivuaineen tutkielmassa selvitetään, miten sosiaalinen media ja siihen liittyvä elämäjulkaiseminen näkyvät suomalaisessa 2000-luvun alun proosassa. Aihetta lähestytään digitalisaation ja sosiaalisen median historiaa sekä kirjallisuustieteellistä lähestymistapaa esittelemällä. Kontekstualisoiminen tapahtuu aiheeseen liittyvän kaunokirjallisuusotoksen avulla. Kaunokirjallisuuskatsauksesta edetään tarkempaan yksittäisen kokonaisteoksen erittelyyn elämäjulkaisemisteemaa silmällä pitäen. Tähän tarkoitukseen tutkielman varsinainen kohdeteos Anna-Kaari Hakkaraisen jälkirealistinen romaani Kristallipalatsi (2016) soveltuu hyvin, sillä se tarkastelee elämäjulkaisijuutta fiktion keinoin historiallisesta, (näennäis)tieteellisestä ja elämäjulkaisijayksilön osaan eläytyvästä näkökulmasta. Muun muassa moninaiset näkökulmat ja heterogeeninen henkilöasetelma edesauttavat näiden ilmiöiden tematisoitumista. Teoksen päähenkilö on koukussa tykkäyksiin ja hänen hyödyntämänsä digitaalisen diskurssin taustalla vaikuttaa kaupallinen ideologia. Tutkielman sisältämä kaunokirjallisuuskatsaus viittaa siihen, että proosan keinot imitoida digitaalisia multimodaalisia esikuviaan ovat moninaiset: kuvan, typografian, kielen ja huumorin keinoja käytetään. Katsaukseen valikoituneiden proosateosten sisältämät sosiaalisen median representaatiot ovat varsin kriittisiä. Ne sisältävät digitaalisen kulttuurin negatiivisten lieveilmiöiden kuvausta kuten kaunokirjallisuuden konfliktilähtöiseen luonteeseen usein sopiikin. Katsauksessa korostuu, että sosiaalisen median tekstit sisältävät mm. vihapuhetta, someraivoa, nais- ja muukalaisvihamielisiä kannanottoja. Kyberuhkien ja virtuaalisten identiteettien seassa operoiminen ei sekään ole sosiaalisen median käyttäjille ongelmatonta. Näin kaunokirjallisuus asettuu oppositioon suhteessa somemyönteiseen yhteiskunnalliseen retoriikkaan. Kristallipalatsin narratologinen erittely ja subtekstianalyysi paljastavat, että kirjailija Hakkaraisen luoma kaunokirjallinen kuvaus elämäjulkaisijasta on monitasoinen ja aktivoi lukijassa historiallisen tietämyksen, tieteen, humanistisen sivistyksen, kulutuskriittisyyden ja empatian näkökulmia — kaikkia niitä asioita, joita ”totuuden jälkeisestä” ajasta sanotaan puuttuvan.Abstract. Social media is one of the most prominent forms of digitization in the early twenty-first century. However, it has not been previously studied as an element in Finnish fiction from the perspective of literary studies. In this literary studies thesis I investigate how social media and related life-publishing are visible in early twenty-first century Finnish prose. The subject is approached through an examination of the history of digitization and the history of social media as well as literary studies methods. The thesis is contextualized using samples of fiction. The thesis begins with a literary review followed by a more detailed breakdown of a novel focusing on the theme of life-publishing. For this purpose, I have selected Anna-Kaari Hakkarainen’s postrealist novel Kristallipalatsi (2016) which examines life-publishing through historical and pseudo-scientific perspectives, as well as through the eyes of a life-publishing individual. The novel brings to view the ideologies and addictiveness of contemporary discourses reflected by texts in the social media. Among other things, its diverse perspectives and its heterogeneous character setting favor the thematization of these phenomena. The main character of the novel is addicted to likes and a market ideology works behind the digital discourse used by the protagonist. The literary fiction review included in this thesis demonstrates that the methods of prose for imitating its digital multimodal models are manifold: the means of image, typography, language, and humor are all used. The representations of social media found within the prose works included in the review are identifiably critical. This includes the description of the negative byproducts of digital culture which suits the conflict-based nature of fiction. The review emphasizes that social media texts contain, for example, hate speech, social media rage, misogyny, and xenophobia. In addition, operating amongst cyber threats and virtual identities is far from unproblematic for the users of social media. In this way, fiction takes a critical stance toward the social media positive rhetoric of our society. The narratological and subtext analyses of Kristallipalatsi reveal a multifaceted literary representation of a life-publisher. At the same time, it activates in the reader historical, scientific, humanistic, consumer critical, and empathic perspectives — all outlooks thought to have disappeared from the post-truth era

New resinicolous Chaenothecopsis species from China

Four new resinicolous species of Chaenothecopsis are described from China: Chaenothecopsis perforata from exudate of Rhus chinensis (Anacardiaceae), C. pallida from exudate of Ailanthus altissima (Simaroubaceae), C. resinophila from exudate of Kalopanax septemlobus (Araliaceae) and C. hunanensis from resin of Pinus massoniana (Pinaceae). All the new species are compared with previously described resinicolous mycocalicioid taxa, and several new features in these species are presented. The newly described species cannot always be distinguished by any single character, but they all possess unique combinations of morphological, chemical and ecological features. Several aspects in the ecology and evolution of boreal and tropical resinicolous species are briefly discussed.</p

Electrical conduction mechanisms of metal / high- T c superconductor (YBCO) interfaces

Current-voltage characteristics of Au/YBa2Cu3Ointerfaces (Au/YBCO), built on optimally-doped YBCO thin films, grown by pulsed laser deposition, were measured as a function of temperature in the 50 K to 270 K range, for two different resistance states. A non-trivial equivalent circuit model is proposed, which reveals the existence of a highly inhomogeneous scenario composed by two complex layers: one presenting both a non-linear Poole-Frenkel conduction as well as variable range hopping localization effects (probably associated with YBa2Cu3O6) mixed with a minor metallic phase, while the other is also composed by a mixture of YBCO with different oxygen contents, where a metallic ohmic phase still percolates. A microscopic description of the effects produced by the resistance switching is given, showing the evolution of carrier traps, localization effects and dielectric behavior for each state. The dielectric behavior is interpreted in terms of a Maxwell-Wagner scenario.Fil: Lanosa, Leandro Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; ArgentinaFil: Huhtinen, H. University of Turku; FinlandiaFil: Paturi, P. University of Turku; FinlandiaFil: Acha, Carlos Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentin

Получение и магнитные свойства ZnO:Li,Fe

Методом традиционной твёрдотельной реакции были получены объемные керами­ческие образцы ZnO, легированного Fe и Li. Методом сканирующей электронной микроскопии иссле­дована морфология поверхности сколов и определены размеры кристаллито

Critical behavior of magnetoresistance near the metal-insulator transition of La₀₇Ca₀₃MnO₃

The resistivity, ρ(T), of thin film and bulk samples of La₀₇Ca₀₃MnO₃ is investigated in magnetic fields between 0-10 T and temperatures between 10-340 K. Metallic resistivity, ρlt(T)=ρr+ρ2T2+ρ4.5T4.5, is observed well below the metal–insulator transition (MIT) temperature TMI. For T>TMI, the resistivity is governed by the Shklovskii-Efros variable-range hopping mechanism, giving View the MathML sourceyesBelgorod State Universit

Transport properties of resistive switching in Ag/Pr0.6Ca0.4MnO3/Al thin film structures

Thin films of Pr0.6Ca0.4MnO3 were prepared by pulsed laser deposition with an asymmetric pair of Ag and Al metal electrodes in order to study their resistive switching properties. The devices exhibited stable voltage controlled bipolar switching which proved to be reliable and non-volatile. The resistive states show a well-defined dependence on the write voltage, which was used to achieve several intermediate states, indicating that the devices could be utilized in hardware implementations of neuromorphic computing. The switching mechanism was attributed to the electric-field assisted migration of oxygen vacancies at the Al-electrode interface, resulting in a formation and modulation of a rectifying interfacial AIO(x) layer. The current-voltage characteristics were analyzed by means of the power exponent representation, which hinted to a device state dependent interplay of bulk-limited Poole-Frenkel conduction and interface-limited Schottky conduction. A deeper understanding of resistive switching characteristics in Ag/Pr0.6Ca0.4MnO3/Al will lead towards further advances in manganite-based neuromorphic circuits. (C) 2019 The Authors. Published by Elsevier B.V

Effect of ex situ Post-annealing Treatments on Sr2FeMoO6 Thin Films

Magnetoresistive Sr2FeMoO6 thin films were grown by pulsed laser deposition at optimized deposition atmosphere and temperature. Films were then ex situ post-annealed in different atmospheres and by vacuum annealing at temperatures between 500 A degrees C and 1100 A degrees C. Ar and air annealed samples were destroyed by ex situ post-annealing treatment, due to formation and dominance of SrMoO4 impurity phase. X-ray diffraction showed no impurities and full texturation of vacuum and ArH2 (5%) annealed samples. Those samples showed also similar magnetic and magnetoresistive behavior like as-deposited sample. Neither magnetic, magnetotransport nor structural properties could be improved by ex situ post-annealing treatments