Phase transitions and optically induced phenomena in cooperative systems

Daniele Fausti

Research output: ThesisThesis fully internal (DIV)

3404 Downloads (Pure)

Abstract

Cooperative systems form one of the few “terra incognita” left in condensed matter science. Even though all the constituent laws are known, the interplay between lattice, orbital, spin and charge degrees of freedom gives rise to a big variety of unconventional properties of which the nature is still widely debated. The interaction between light and matter lies at the very fundament of our knowledge of nature. Absorption, scattering, or diffraction technique are extremely insightful tools to explore and understand the properties of cooperative systems. On the other hand, light irradiation can also strongly affect the delicate equilibrium between the different degrees of freedom in cooperative systems and can thereby trigger various physical phenomena. In this sense, via light irradiation, we can manipulate and investigate the properties of complex matter outside of their equilibrium state. This helps unraveling the nature of complex systems’ equilibrium properties and, simultaneously, gives access to novel states of matter not reachable under the equilibrium conditions. The work presented in this thesis consists of two major parts. In the first chapters we will make use of light as an "investigation tool". Through inelastic scattering we investigated the lattice and magnetic properties of two families of compounds whose properties are determined by the low dimensional character of the interactions between different degrees of freedom. In the second part we will present a new experimental tool we developed to study the “light-induced effects” on matter; time resolved Raman spectroscopy allows the distinction between thermally and non-thermally induced phenomena.
Original languageEnglish
QualificationDoctor of Philosophy
Supervisors/Advisors
  • Loosdrecht, Paul H.M. van, Supervisor, External person
Publisher
Print ISBNs9789036734769
Publication statusPublished - 2008

Keywords

  • Spingolven, Fononen, Coöperatieve verschijnselen, Boraten,
  • diëlektrische en optische eigenschappen, spectroscopie

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