A5018702516- Material Dynamics and Properties
- Diamond and Carbon-based Materials Research
- Topological Materials and Phenomena
- Phase Equilibria and Thermodynamics
- Glass properties and applications
- High-pressure geophysics and materials
- Ion-surface interactions and analysis
- Rare-earth and actinide compounds
- Theoretical and Computational Physics
- Chemical Thermodynamics and Molecular Structure
- Advanced Surface Polishing Techniques
- Thermodynamic properties of mixtures
- Spectroscopy and Quantum Chemical Studies
- Advanced Condensed Matter Physics
- Metal and Thin Film Mechanics
- Advanced Semiconductor Detectors and Materials
- Phase-change materials and chalcogenides
Universidad Autónoma de Madrid
2017-2025
Weatherford College
2023
GTx (United States)
2023
Both structural glasses and disordered crystals are known to exhibit anomalous thermal, vibrational, acoustic properties at low temperatures or energies, what is still a matter of lively debate. To shed light on this issue, we studied the halomethane family ${\mathrm{CBr}}_{n}{\mathrm{Cl}}_{4\ensuremath{-}n}$ ($n=0,1,2$) temperature where, despite being perfectly translationally ordered stable monoclinic crystals, glassy dynamical features had been reported from experiments molecular...
Diamond properties can be tuned by doping and ion-beam irradiation is one of the most powerful techniques to do it in a controlled way, but also produces damage other aftereffects. Of particular interest boron which, moderate concentrations, causes diamond become p-type semiconductor and, at higher superconductor. Nevertheless, preparation superconducting boron-doped ion implantation hampered amorphization subsequent graphitization after annealing. The aim this work was explore possibility...
Crystalline Bi100−xSbx alloys are known as the first discovered topological insulators, well for their promising thermoelectric properties, while amorphous counterparts exhibit superconductivity (Tc > 6 K). However, strong tendency to crystallize has hindered both study and practical applications of Bi Bi–Sb alloys. To explore possibility obtaining superconducting phases enhancing we investigated ion-beam irradiation a method induce amorphization in We report experiments on pure using...
Abstract Recent findings of structural glasses with extremely high kinetic and thermodynamic stability have attracted much attention. The question has been raised as to whether the well-known, low-temperature “glassy anomalies” (attributed presence two-level systems [TLS] “boson peak”) persist or not in these ultrastable lower configurational entropy. To resolve previous contradictory results, we study a particular type glass, TPD, which can be prepared by physical vapor deposition...
Bismuth-antimony alloys are among the most studied topological insulators and also have very promising thermoelectric properties. In addition, in amorphous state they exhibit superconductivity with critical temperatures range 6.0–6.4 K. this work, we prepared different polycrystalline films of Bi100–xSbx (x = 0, 5, 10, 15), induced, through ion beam irradiation, significant damage their internal structure aim amorphizing material. Specifically, irradiated Bi ions 10–30 MeV range, exploiting...
We present low-temperature specific heat (Cp) measurements of a monoclinic P2_{1}/c crystal formed by quasiplanar molecules tetrachloro-m-xylene. The dynamic disorder frozen at the asymmetric unit (formed half molecule) consists reorientation around three-fold-like axis perpendicular to benzene ring. Such minimal gives rise typical glassy anomalies, as linear in contribution Cp ascribed two-level systems and broad maximum 6.6 K Cp/T^3 (the boson peak). discuss these results framework other...
The specific heat Cp of toluene, doped with 2 mol% ethanol to avoid rapid crystallization, has been measured in both glass and crystal states, special accuracy at low temperatures the range 1.8−20 K using thermal relaxation method. By making use complementary curves reference state, we have able obtain entropy curve eventually residual toluene zero-temperature limit, that is found be 5.1 J/(K⋅mol). This value clearly lower than others pre-viously reported literature, which lack knowledge...
Diamond properties can be tuned by doping and ion-beam irradiation is one of the most powerful techniques to do it in a controlled way, but also produces damage other aftereffects. Of particular interest boron which, moderate doses, causes diamond become p-type semiconductor and, at higher content, superconductor. Nevertheless, preparation superconducting boron-doped (BDD) ion implantation hampered amorphization subsequent graphitization after annealing. The aim this work was explore...
Abstract Recent findings of structural glasses with extremely high kinetic and thermodynamic stability have attracted much attention. The question has been raised as to whether the well-known, low-temperature “glassy anomalies” (attributed presence two-level systems [TLS] “boson peak”) persist or not in these ultrastable lower configurational entropy. To resolve previous contradictory results, a particular type glass studied, TPD, which can be prepared by physical vapor deposition...