Search results for "tavu"
showing 10 items of 710 documents
Blogien uskottavuuden vaikutus kuluttajien asenteisiin suosittelua ja brandia kohtaan
2016
Blogit ovat nykyään olennainen markkinointikanava ja osa kuluttajien ostoprosessia, sillä monet kuluttajat lukevat arvosteluja tuotteista ja palveluista blogeista ennen osto-päätöksen tekemistä. Blogit sisältävät kasvavassa määrin kaupallista sisältöä, jonka tarkoituksena on myydä kuluttajille erilaisia tuotteita yleensä suosittelun keinoin. Tämä tutkimus perehtyy kaupallisten suositusten vaikutukseen kuluttajien asenteisiin suosittelua ja brandia kohtaan. Uskottavuuden muodostumista tutkittiin asiantuntijuuden, luotettavuuden, samankaltaisuuden, viehättävyyden ja sivuston uskottavuuden kautta. Tutkimuksen tarkoituksena oli selvittää vaikuttaako blogien uskottavuus myönteisesti blogimainonn…
Elektroninen suosittelumarkkinointi blogeissa : viestijän ja viestin sisällön vaikutukset eWOM-viestinnän uskottavuuteen ja kuluttajakäyttäytymiseen
2015
Blogien lukeminen ja sen myötä markkinointi blogeissa on lisääntynyt viime vuosina merkittävästi. Blogit tarjoavat mahdollisuuden jakaa reaaliajassa multimediasisältöjä tuhansille blogin aiheesta kiinnostuneille lukijoille. Bloggaajista on tullut tunnettuja henkilöitä, joiden mielipiteitä arvostetaan ja seurataan. eWOM-viestintä koetaan myös massamainontaa uskottavammaksi. Tämän tutkielman päätavoitteena oli tutustua paremmin blogeihin mark-kinointiviestinnän alustana. Tutkimuksen teoriaosuudessa pääpaino on elektronisessa word-of-mouth –viestinnän markkinointikäytössä ja uskottavuudessa. Lisäksi teoriaosuutta täydentävät markkinoinnin ja verkkoarvioiden kirjallisuus. Blogien suosittelupost…
Odd triplet superconductivity induced by a moving condensate
2020
It has been commonly accepted that a magnetic field suppresses superconductivity by inducing the ordered motion of Cooper pairs. We demonstrate that a magnetic field can instead provide a generation of superconducting correlations by inducing the motion of a superconducting condensate. This effect arises in superconductor/ferromagnet heterostructures in the presence of Rashba spin-orbital coupling. We predict the odd-frequency spin-triplet superconducting correlations called the Berezinskii order to be switched on at large distances from the superconductor/ferromagnet interface by the application of a magnetic field. This is shown to result in the unusual behavior of Josephson effect and lo…
Mean-field theory for superconductivity in twisted bilayer graphene
2018
Recent experiments show how a bilayer graphene twisted around a certain magic angle becomes superconducting as it is doped into a region with approximate flat bands. We investigate the mean-field s-wave superconducting state in such a system and show how the state evolves as the twist angle is tuned, and as a function of the doping level. We argue that part of the experimental findings could well be understood to result from an attractive electron-electron interaction mediated by electron-phonon coupling, but the flat-band nature of the excitation spectrum also makes the superconductivity quite unusual. For example, as the flat-band states are highly localized around certain spots in the st…
Flat-band superconductivity in strained Dirac materials
2016
We consider superconducting properties of a two-dimensional Dirac material such as graphene under strain that produces a flat band spectrum in the normal state. We show that in the superconducting state, such a model results in a highly increased critical temperature compared to the case without the strain, inhomogenous order parameter with two-peak shaped local density of states and yet a large and almost uniform and isotropic supercurrent. This model could be realized in strained graphene or ultracold atom systems and could be responsible for unusually strong superconductivity observed in some graphite interfaces and certain IV-VI semiconductor heterostructures.
Coupling the Higgs mode and ferromagnetic resonance in spin-split superconductors with Rashba spin-orbit coupling
2022
We show that the Higgs mode of superconductors can couple with spin dynamics in the presence of a static spin-splitting field and Rashba spin-orbit coupling. The Higgs-spin coupling dramatically modifies the spin susceptibility near the superconducting critical temperature and consequently enhances the spin pumping effect in a ferromagnetic insulator/superconductor bilayer system. We show that this effect can be detected by measuring the magnon transmission rate and the magnon-induced voltage generated by the inverse spin Hall effect.
Superconducting Triplet Rim Currents in a Spin-Textured Ferromagnetic Disk
2022
Since the discovery of the long-range superconducting proximity effect, the interaction between spin-Triplet Cooper pairs and magnetic structures such as domain walls and vortices has been the subject of intense theoretical discussions, while the relevant experiments remain scarce. We have developed nanostructured Josephson junctions with highly controllable spin texture, based on a disk-shaped Nb/Co bilayer. Here, the vortex magnetization of Co and the Cooper pairs of Nb conspire to induce long-range triplet (LRT) superconductivity in the ferromagnet. Surprisingly, the LRT correlations emerge in highly localized (sub-80 nm) channels at the rim of the ferromagnet, despite its trivial band s…
Self-consistent calculation of the flux-flow conductivity in diffusive superconductors
2017
In the framework of Keldysh-Usadel kinetic theory, we study the temperature dependence of flux-flow conductivity (FFC) in diffusive superconductors. By using self-consistent vortex solutions we find the exact values of dimensionless parameters that determine the diffusion-controlled FFC both in the limit of the low temperatures and close to the critical one. Taking into account the electron-phonon scattering, we study the transition between flux-flow regimes controlled by either the diffusion or the inelastic relaxation of nonequilibrium quasiparticles. We demonstrate that the inelastic electron-phonon relaxation leads to the strong suppression of FFC compared to the previous estimates, mak…
Field-induced coexistence of s++ and s± superconducting states in dirty multiband superconductors
2018
In multiband systems, such as iron-based superconductors, the superconducting states with locking and antilocking of the interband phase differences are usually considered as mutually exclusive. For example, a dirty two-band system with interband impurity scattering undergoes a sharp crossover between the s± state (which favors phase antilocking) and the s++ state (which favors phase locking). We discuss here that the situation can be much more complex in the presence of an external field or superconducting currents. In an external applied magnetic field, dirty two-band superconductors do not feature a sharp s±→s++ crossover but rather a washed-out crossover to a finite region in the parame…
Hierarchies of length-scale based typology in anisotropic U(1)s-wave multiband superconductors
2019
Since Ginzburg and Landau's seminal work in 1950, superconducting states have been classified by the hierarchy of the fundamental length scales of the theory, the magnetic-field penetration lengths and coherence lengths. In the simplest single-component case they form a dimensionless ratio κ. The model was generalized by Ginzburg for anisotropic materials in 1952. In this paper we expand the above length-scale analysis to anisotropic multicomponent superconductors that can have multiple coherence lengths as well as multiple magnetic-field penetration lengths, leading to unconventional length-scale hierarchies. We demonstrate that the anisotropies in multiband superconductors lead to new reg…