Curriculum Vitae

Aurelio Agliolo Gallitto was born on November 5, 1966. He graduated in Physics at the University of Palermo in 1993. The thesis title was: Nonlinear Response and Electrical Conductivity of High-Tc Superconductors. His thesis work was mainly devoted to the investigation of third harmonic emission by the high-Tc superconductor YBa2Cu3O7. A phenomenological model was developed to account for the experimental data.

In the 1999, he finished his PhD in Physics at the Department of Physical and Astronomical Sciences, University of Palermo (Italy).

Title of thesis: Nonlinear Microwave Response of High-Tc Superconductors

Abstract: Nonlinear microwave emission by YBa2Cu3O7 (YBCO) and Ba0.6K0.4BiO3 (BKBO) crystals is investigated. Second- and third-harmonic signals are studied as a function of the temperature, applied magnetic field and input power level. A phenomenological theory based on the time variation of the order parameter induced by the microwave field is proposed, which accounts quite well for both second and third harmonic signals of YBCO near Tc at low applied field. A qualitatively agreement is obtained at high fields. The experimental data of BKBO are discussed in the framework of models previously reported in the literature. We show that there are several mechanisms responsible for harmonic emission in BKBO crystals: they play a different role depending on the temperature and the intensity of the applied field. We suggest that harmonic emission at temperatures far from Tc is due to nonlinear processes in weak links or flux motion. The nonlinear emission near Tc in both YBCO and BKBO crystals is ascribable to the time variation of the order parameter induced by the microwave magnetic field.

He collaborates with Prof. M. R. Trunin, and coworkers at the From October 1996 to December 1996 he worked at the Institute of Solid State Physics in Chernogolovka, Moscow, in the investigation of the microwave response of high-Tc superconductors.

Presently, he is researcher at the Department of Physical and Astronomical Sciences, University of Palermo (Italy). His research activity is devoted to the investigation of microwave properties of high-Tc superconductors with an emphasis on the nonlinear microwave response.