El complejo Turbidítico del Carbonífero del Priorato (Tarragona)

[ES] Se caracterizan las facies de una sucesion de 2.250 m de potencia de sedimentos carboniferos turbiditicos de la parte central del Priorato (zona de las vilellas-Poboleda). En 10s materiales paleozoicos de este area se distinguen tres unidades IitoestratigrAficas carboniferas que integran el Complejo Turbidítico del Prioraro y que yacen discordantes sobre 10s materiales del Devdnico medio-superior (unidad 1). Los materiales de la unidad inferior (unidad 2) se depositaron en un ambiente de talud - apron y constan fundamentalmente de areniscas que intercalan niveles deslizados de liditas, calizas y areniscas. Los depdsitos de las unidades 3 y 4 rnuestran diversas asociaciones de facies tipicas de ambientes de abanico submarino profundo. La unidad 3 muestra facies de llanura de cuenca y depositos arenosos de un canal intercalado. La unidad 4 esta constituida por tres megasecuencias negativas que corresponden a otros tantos episodios de progradacion de un sistema de lóbulo de abanico submarino. Se discuten las relaciones entre las asociaciones de facies de las tres unidades litoestratigraficas del complejo turbiditico y su asimilacidn a unidades deposicionales dentro de modelos de sedimentaoidn submarina.[EN] Facies characteristics are described for a 2.250 m thick succesion of Carboniferous sediments which crops out along the Las Vilellas- Poboleda road (central zone of El Priorato, Catalan Coastal Ranges). In the studied area three main Carboniferous lithostratigraphic units have been distinguished. The lower Carboniferous unit unconformably overlie a basal Devonian unit (unit 1 or Vilellas unit), which is formed by shales alternating with cherts and quarztose sandstones. Unit 2 (Basetas unit) is mainly composed of lithic sandstones. These caotic sediments are interpreted like deposits of a slopeapron system. Severa1 facies associations, typical from deep sea fan environments, are recognized in the two uppermost units: outer fan facies and channel deposits in the Scala Dei unit (unit 3) and distal lobe, proximal non-channelized lobe and proximal channelized lobe facies associations in the Poboleda unit (unit 4). The outer fan deposits consist of monotonous shales with interbedded thin sandstones. A sandstone level, 60 m thick, is found within this facies and has been interpreted as channel deposits. The fan-lobe deposits are arranged in three coarsening and thickening upward megasequences, 500 m thick each one and reflect three major episodes of a fan system progradation. The distal-fan lobe deposits are composed of medium to thick-bedded classical turbidites (low density turbidite currents) internally organized in thickening upward cycles too. The proximal, channelized fan-lobe deposits are formed by amalgamated sandstones and pebbly sandstones deposited through high density currents. The entire sequence of the El Priorato Turbidite Complex seems more likely originated by three well differenciated turbidite systems, which were probably originated by palaeogeographic changes related to tectonic and eustatic changes.Peer reviewe

Correlation of thermoelectric and spin properties in magnetic oxides

Thermoelectrics are a potentially transformative power generation technology because they possess the property to convert directly heat into an electric voltage. In addition, thermoelectrics are a pollution-free method for generating energy. Until last decade, efficiency of thermoelectric materials has remained low, but due to the study of nanostructured materials they are becoming promising for commercial use. In this work we will be introduced in the world of thermoelectric characterization. For this purpose we are going to perform thermal, transport, thermoelectric and magnetic measurements in bulk single crystal magnetite and polycrystalline bismuth

Upper Eocene-Lowermost Miocene charophyte succession in the Ebro Basin (Spain). Contribution to the charophyte biozonation in Western Europe

A charophyte succession has been established in nineteen sections and eight isolated outcrops from the Ebro Basin, ranging from the Priabonian ro the Aquitanian. Most assemblages were recovered fmm continuous sections and their abundance and diversity allow to define a new zonal scheme for the Upper Eocene-Lower Miocene of Europe. The new zonation includes nine subdivisions, based on the distribution of thirty-two species and directly correlated with the mammal standard levels. Changes in diversity, occurring mainly in the Middle and Upper Oligocene, have been related to climatíc variations. A new species, Chara sp. A. is also described and figured

Biozonacion del Paleogeno continental de la zona oriental de la Cuenca del Ebro mediante carofitas: implicacions en la biozonacion general de carofitas de Europa occidental

A charophyte biozonation of the Paleogene (Thanetian-Chattian) sequences of the Eastern Ebro Basin (NE Spain) is proposed. This biozonation has been based on an intensive sampling carried out on well correlated sections which included, in some cases, fossil mammal localities. Bothfacts haveresultedin agood chronostratigraphic control of the biozonation. One of the most noticeable contributions from this local point of view is the characterization of the Ilerdian in the continental Ebro Basin sequences by the Maedleriella lavocati biozone. Although in afirst approach this biozonation is intended to be local the new data in the Eastern Ebro Basin have enlarged the ranges of some widespread charophyte index species. These changes in the charophyte sp&ies ranges has led to suggest some remarkable modifications of the preexistin~ Riveline' s (1986) charophyte biozonationfor western Europe: 1) TheN. (T. ) thaleri biozone siaried in the Ilerdian and not in the Cuisian. 2) The definition of new Late Eocene (S. labellata) and Late Oligocene (H. lagenalis) biozones. 3) The enlargement of the range of severa1 species which has resulted in suppressionof the Chara notata biozone and in redefinition of Chara microcera, St. pinguis, St. vectensis and Sr. berdotensis biozones. From apaleogeographic point of view the global percentages of pluricontinental, european and iberian species of the Paleogene Eastern Ebro Basin charophyte record suggest some kind of isolation of the charophyte populations in NE Iberia. This isolation could be enhanced by paleogeographic constraints during Bartonian and Latest Priabonian to Stampian transition.Peer Reviewe

Situación de los jóvenes en el mercado laboral tras la crisis de 2008 en España

En este TFG se analiza la situación laboral de los jóvenes en España tras la crisis económica comenzada en elaño 2008. El objetivo principal del proyecto es reflejar los cambios que han tenido lugar en este colectivo enlos principales indicadores de mercado laboral entre el período anterior y posterior a dicha crisis, así comocomparar los datos en España con respecto a los de la Unión Europea y también con Aragón . Por último, también se va a hablar de las medidas que se han tomado por parte de los organismos españoles y europeos.<br /

Isotropic spin and inverse spin Hall effect in epitaxial (111)-oriented Pt/Co bilayers

The spin-to-charge current interconversion in bilayers composed of ferromagnetic and nonmagnetic layers with strong spin-orbit coupling has garnered considerable attention due to its exceptional potential in advancing spintronics devices for data storage and logic applications. Platinum (Pt) stands out as one of the most effective materials for generating spin current. While the spin conversion efficiency is isotropic in polycrystalline Pt samples, an ongoing debate persists regarding its dependence on the crystalline direction in single crystalline samples. In this study, we aim to comprehensively evaluate the in-plane anisotropy of spin-charge interconversion using an array of complementary Spin Hall and inverse Spin Hall techniques with both incoherent and coherent excitation. Specifically, we investigate the spin-to-charge interconversion in epitaxial, (111)-oriented, Co/Pt bilayers with low surface roughness, as resulted from x-ray experiments. By varying the thickness of the Pt layer, we gain insights into the spin-charge interconversion in epitaxial Pt and highlight the effects of the interfaces. Our results demonstrate an isotropic behavior within the limits of our detection uncertainty. This finding significantly enhances our understanding of spin conversion in one of the most relevant systems in spintronics and paves the way for future research in this field.Comment: Article accepted for publication in Physical Review Materials, DOI not received ye

Spin transport properties of spinel vanadate-based heterostructures

Spin-orbit coupling and breaking of inversion symmetry are necessary ingredients to enable a pure spin current-based manipulation of the magnetization via the spin-orbit torque effect. Currently, magnetic insulator oxides with non-dissipative characteristics are being explored. When combined with non-magnetic heavy metals, known for their large spin-orbit coupling, they offer promising potential for energy-efficient spin-orbitronics applications. The intrinsic electronic correlations characterizing those strongly correlated oxides hold the promises to add extra control-knobs to the desired efficient spin-wave propagation and abrupt magnetization switching phenomena. Spinel vanadate FeV2O4 (FVO) exhibits several structural phase transitions which are accompanied by an intricate interplay of magnetic, charge and orbital orderings. When grown as a thin film onto SrTiO3, the compressive strain state induces a perpendicular magnetic anisotropy, making FVO-based heterostructures desirable for spin-orbitronics applications. In this study, we have optimised the deposition of stoichiometric and epitaxial Pt/FVO heterostructures by Pulsed Laser Deposition and examined their spin-related phenomena. From angle-dependent magnetotransport measurements, we observed both Anisotropic Magnetoresistance (AMR) and Spin Hall Magnetoresistance (SMR) effects. Our findings show the SMR component as the primary contributor to the overall magnetoresistance, whose high value of 0.12% is only comparable to properly optimized oxide-based systems

Spin-to-charge conversion by spin pumping in sputtered polycrystalline Bix_xSe1−x_{1-x}

Topological materials are of high interest due to the promise to obtain low power and fast memory devices based on efficient spin-orbit torque switching or spin-orbit magnetic state read-out. In particular, sputtered polycrystalline Bi$_x$Se$_{1-x}$ is one of the materials with more potential for this purpose since it is relatively easy to fabricate and has been reported to have a very high spin Hall angle. We study the spin-to-charge conversion in Bi$_x$Se$_{1-x}$ using the spin pumping technique coming from the ferromagnetic resonance in a contiguous permalloy thin film. We put a special emphasis on the interfacial properties of the system. Our results show that the spin Hall angle of Bi$_x$Se$_{1-x}$ has an opposite sign to the one of Pt. The charge current arising from the spin-to-charge conversion is, in contrast, lower than Pt by more than one order of magnitude. We ascribe this to the interdiffusion of Bi$_x$Se$_{1-x}$ and permalloy and the changes in chemical composition produced by this effect, which is an intrinsic characteristic of the system and is not considered in many other studies