Now showing items 1-10 of 10

    • Disentangling a and ß relaxation in orientationally disordered crystals with theory and experiments 

      Cui, Bingyu; Gebbia, Jonathan Fernando; Tamarit Mur, José Luis; Zaccone, Asessio (American Institute of Physics (AIP), 2018-05-21)
      Article
      Open Access
      We use a microscopically motivated Generalized Langevin Equation (GLE) approach to link the vibrational density of states (VDOS) to the dielectric response of orientational glasses (OGs). The dielectric function calculated ...
    • Dynamics and local ordering of pentachloronitrobenzene: a molecular-dynamics investigation 

      Gebbia, Jonathan Fernando; Henao Aristizabal, Andrés; Negrier, Philippe; Aguilà Aviles, David; Tamarit Mur, José Luis; Pardo Soto, Luis Carlos (Royal Society of Chemistry (RSC), 2023-11-06)
      Article
      Open Access
      Plastic phases are constituted by molecules whose centers of mass form a long range ordered crystalline lattice, but rotate in a more or less constrained way. Pentachloronitrobenzene (PCNB) is a quasi-planar hexa-substituted ...
    • Emergence of glassy features in halomethane crystals 

      Moratalla Martín, Manuel Eduardo; Gebbia, Jonathan Fernando; Ramos Ruiz, Miguel Angel; Pardo Soto, Luis Carlos; Tamarit Mur, José Luis (American Physical Society (APS), 2019-01-02)
      Article
      Open Access
      Both structural glasses and disordered crystals are known to exhibit anomalous thermal, vibrational, and acoustic properties at low temperatures or low energies, what is still a matter of lively debate. To shed light on ...
    • Glassy Anomalies in the Low-Temperature Thermal Properties of a Minimally Disordered Crystalline Solid 

      Gebbia, Jonathan Fernando; Ramos, M. A.; Szewczyk, Daria; Jezowski, Andrzej; Krivchikov, Alexander; Horbatenko, Y.V; Guidi, T.; Bermejo, F. J.; Tamarit Mur, José Luis (2017-11-21)
      Article
      Open Access
      The low-temperature thermal and transport properties of an unusual kind of crystal exhibiting minimal molecular positional and tilting disorder have been measured. The material, namely, low-dimensional, highly anisotropic ...
    • Heat capacity anomalies of the molecular crystal 1-fluoro-adamantane at low temperatures 

      Szewczyk, Daria; Gebbia, Jonathan Fernando; Jezowski, Andrzej; Krivchikov, Alexander; Guidi, T.; Cazorla Silva, Claudio; Tamarit Mur, José Luis (Nature, 2021-09-20)
      Article
      Open Access
      Disorder–disorder phase transitions are rare in nature. Here, we present a comprehensive low-temperature experimental and theoretical study of the heat capacity and vibrational density of states of 1-fluoro-adamantane ...
    • Low-Temperature Heat Capacity Anomalies in Ordered and Disordered Phases of Normal and Deuterated Thiophene 

      Miyazaki, Yuji; NAKANO, Motohiro; Krivchikov, Alexander; Gebbia, Jonathan Fernando; Cazorla Silva, Claudio; Tamarit Mur, José Luis (2021-03-04)
      Article
      Open Access
      We measured the specific heat Cp of normal (C4H4S) and deuterated (C4D4S) thiophene in the temperature interval of 1 = T, K = 25. C4H4S exhibits a metastable phase II2 and a stable phase V, both with frozen orientational ...
    • Modelling shape-memory effects in ferromagnetic alloys 

      Gebbia, Jonathan Fernando; Lloveras Muntané, Pol Marcel; Planes Vila, Antoni; Castán Vidal, Teresa; Saxena, Avadh (Springer, 2015-07-21)
      Article
      Restricted access - publisher's policy
      We develop a combined Ginzburg–Landau/micromagnetic model dealing with conventional and magnetic shape-memory properties in ferromagnetic shape-memory materials. The free energy of the system is written as the sum of ...
    • Multiferroic and related hysteretic behavior in ferromagnetic shape memory alloys 

      Gebbia, Jonathan Fernando; Castán Vidal, Teresa; Lloveras Muntané, Pol Marcel; Porta Tena, Marcel; Saxena, Avadh; Planes Vila, Antoni (2017-08-29)
      Article
      Open Access
      We combine a Ginzburg–Landau model for a ferroelastic transition with the theory of micromagnetism to study the magnetostructural behavior leading to multicaloric effects in ferromagnetic shape memory alloys. We analyze ...
    • Propiedades vitreas emergentes en cristales moleculares 

      Gebbia, Jonathan Fernando (Universitat Politècnica de Catalunya, 2021-10-06)
      Doctoral thesis
      Open Access
      One of the most complex and unsolved problems in physics is the glass transition problem, in which the resulting state, the glass, exhibits unique and anomalous properties. During the transition, a kinetic freezing phenomenon ...
    • Secondary relaxation in the terahertz range in 2-adamantanone from theory and experiments 

      Cui, Bingyu; Gebbia, Jonathan Fernando; Romanini, Michela; Fernandez Perea, Ricardo; Bermejo, F. J.; Tamarit Mur, José Luis; Zaccone, Asessio (American Physical Society (APS), 2020-03-20)
      Article
      Open Access
      We applied the recently developed Generalized Langevin equation (GLE) approach for dielectric response of liquids and glasses to link the vibrational density of states (VDOS) to the dielectric response of a model orientational ...