División Bajas Temperaturas

La División Bajas Temperaturas posee más de 50 años de experiencia en el estudio de propiedades de la materia condensada a bajas temperaturas. Durante un largo período la actividad del laboratorio se centró en la investigación de materiales superconductores y de sistemas electrónicos fuertemente correlacionados. Sin embargo, en los últimos años las líneas de investigación del grupo se han diversificado considerablemente. Además de los temas mencionados, actualmente se estudian películas delgadas y multicapas de manganitas magnetorresistentes, coexistencia de magnetismo y superconductividad, propiedades del He superfluído, sistemas mesoscópicos, entre otras.

Nueva doctora en Bajas Temperaturas

Felicitaciones a Karim Ogando que acaba de doctorarse en el Instituto Balseiro.

Karim Ogando: Tesis en METASUPERFICIES NANOESTRUCTURADAS PARA LA INTEGRACION DE ELEMENTOS ÓPTICOS EN SISTEMAS MICROFABRICADOS dirigida por Hernán Pastoriza.

Size-induced depression of first-order transition lines and entropy-jump in extremely-layered nanocrystalline vortex matter

Nueva publicación del grupo: Yanina Fasano, H. Pastoriza. Size-induced depression of first-order transition lines and entropy-jump in extremely-layered nanocrystalline vortex matter, Accepted in Phys. Rev. Lett. (2015)]

Phase diagram of nanocrystalline and macro-scopic Bi2Sr2CaCu2O8 vortex matter indicating the surface-to-volume vortex ratio for the average HSP, ns (<HSP>), and the nanocrystal-to-macroscopic bindig energy ratio, DeltaEbin. Insert: Normalized entropy-jump at HFOT.

Design of integration-ready metasurface-based infrared absorbers

Nueva publicación del grupo: Karim Ogando, H. Pastoriza. Design of integration-ready metasurface-based infrared absorbers, | J. Appl. Phys. 118, 043109 (2015)

Top frame: typical spectral response of an absorber sample. Arrows mark the more pronounced absorption modes. The main mode is labeled as (i) and secondary modes with subsequent roman numbers. Main frame: effect of the uniform scaling on the spectral response of the absorbers. In the vertical axis, the length of the crosses arms is given as a measure of the scaling. The color map corresponds to the reflectance intensity. We call the scaling of the pattern “uniform” because the parameters a/l = 1.25 and w/l = 0.25 were kept constant. The thickness of the spacer is 380 nm for this samples. The red line marks the position of the cross section of the top panel. The white line marks the linear fitting of the spectral position of the mode (i). Black arrows mark the intersection between the geometrical modes of the structure and the vibrational modes of the molecules of the material. An anti-crossing behaviour can be seen. The grey arrow marks one resonance, attributed to one vibrational mode of CO2, where no anticrossing behaviour is observed. The data of the graphic were interpolated, and the discontinuity on mode (ii) dashed behaviour is a numerical artefact.

Transición de Bosse Glass medida con MEMs

Nueva publicación del grupo: Diego Javier Pérez, G. Nieva H. Pastoriza. Thermodynamic evidence for the Bose glass transition in twinned YBa2Cu3O7−δ crystals, |Phys. Rev. B 92, 020510(R) – Published 21 July 2015

(a) Displacement angle of the oscillator as a function of temperature for different magnetic fields applied at an angle θH=−0.4∘. Inset: Magnetic field versus temperature phase diagram for the measured dM/dT discontinuity in comparison with Bose glass critical temperatures obtained from transport measurements reported by Grigera et al. and Maiorov et al.