Daniele Torsello

Daniele Torsello's picture

Ph.D. in Fisica , 32nd cycle (2016-2019)

Ph.D. obtained in 2020

Dissertation:

Influence of disorder on the fundamental properties of Iron Based Superconductors (Abstract)

Tutors:

Gianluca Ghigo

Research presentation:

Poster

Profile

Research topic

Influence of disorder on the fundamental properties of Iron Based Superconductors

Research interests

Fisica della Materia Condensata / Condensed Matter Physics
Superconduttività e sue Applicazioni / Superconductivity and its Applications

Biography

Since my Bachelor degree in Materials Science at Università degli studi di Milano Bicocca I have developed a strong interest for Solid State Physics. What fascinates me the most is the possibility to develop models that connect the atomic structure expertise of materials to their useful macroscopic properties, resulting in an understanding of fundamental mechanisms that in turn allows one to tune such properties to exploit them for practical applications. After my Bachelor, encouraged also by my supervisor Prof. Emiliano Bonera, I decided to enroll in the international Master Degree program ”Advanced Materials Science”, organized by University of Augsburg, Technische Universität München and Ludwig Maximilian Universität. During the first year of the master program I have had the chance to work for 3 months in two research groups, the Computational Materials Science group lead by Prof. Rossitza Pentcheva at Ludwig Maximilian University and the Theoretical Physics group lead by Prof. Ulrich Eckern at University of Augsburg studying the thermoelectric properties of Lanthanum Cobaltate from a computational point of view.
While working with the latter group I understood that, in order to have a deeper understanding of the physics of materials, I needed to improve my comprehension of the mathematical formalism. For this reason I decided to drop the Advanced Materials Science program, despite the good grades I was collecting, and to start a Master Degree in Theoretical Physics at Università degli Studi di Torino. The interdisciplinarity of my path has proven useful during my Master thesis, under Prof. Marco Truccato supervision, on the study of the ”Role of oxygen knock-out in the change of the electrical properties of Bi-2212 induced by synchrotron radiation nanoprobes”. From this work I
have learnt the important role that computational methods can have in the understanding of physical phenomena, in particular if kept in close connection with experimental research.
This is the approach I am following also in my PhD, in which I am focusing on the effects of ion-irradiation-induced disorder on critical temperature, penetration depth and microwave electrodynamics of doped BaFe2As2 single crystals. The materials are investigated by comparing measurements obtained for the pristine materials and after irradiation with 3.5-MeV protons, 250-MeV Au ions and 1.2-GeV
Pb ions. In order to evaluate the amount of disorder introduced in the sample, Monte Carlo simulations of the irradiation process are performed with the PHITS and SRIM codes, yielding the longitudinal range of the ions in the materials and an estimate of the dpa values in
the crystals. The samples are characterized by a planar waveguide resonator technique, in a cavity perturbation approach, before and after each irradiation session. One of the open issues concerning iron-based superconductors is whether the s± wave model for the order parameter is able to account for the overall effects of disorder, including the low rate of decrease of the critical temperature with the defects concentration. To address this issue, experimental data is compared to calculations made on the basis of the three-band Eliashberg equations, suitably accounting for the impurity scattering.

Scientific branch

PHYS-03/A - Experimental Physics of Matter and Applications
(Area 0002 - Physical sciences)

Awards and Honors

  • Invited seminar nella serie di eventi "Talks : Condensed Matter Physics" alla iowa State University (2019)
  • Presentazione orale alla conferenza SuperFOx2018 (2019)
  • Periodo di ricerca presso Ames Laboratory e Iowa State University in USA (2019)
  • Poster presentation alla scuola ESAS2017 (2019)
  • Poster presentation alla scuola Capri Spring School on Transport in Nanostructures (2019)
  • Presentazione orale alla conferenza FisMat2017 (2019)
  • Presentazione all'evento PhD pitch di IEEE (2019)
  • Organizzazione e coordinazione del workshop internazionale “Evaluation of radiation hardness of materials for nuclear fusion plants” cofinanziato vincendo il bando Cassini 2018 Junior. (2019)
  • Premio per la miglior poster presentation alla scuola internazionale Advanced School on Ion Beam Driven Materials Engineering: Accelerators for a New Technology Era organizzata da ICTP e IAEA (2019)
  • Invited contribution alla conferenza internazionale Vortex 2019 (2019)
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Teaching

Collegi of the degree programmes

Teachings

Bachelor of Science

  • Fisica I. A.A. 2017/18, INGEGNERIA AEROSPAZIALE. Collaboratore del corso
  • Fisica I. A.A. 2018/19, INGEGNERIA AEROSPAZIALE. Collaboratore del corso
  • Fisica I. A.A. 2019/20, INGEGNERIA AEROSPAZIALE. Collaboratore del corso
  • Fisica II. A.A. 2018/19, INGEGNERIA AEROSPAZIALE. Collaboratore del corso
  • Fisica II. A.A. 2019/20, INGEGNERIA AEROSPAZIALE. Collaboratore del corso
MostraNascondi A.A. passati

Research

Institute

Laboratories

Research projects

Projects funded by competitive calls

Supervised PhD students

Publications

Publications by type

PoliTO co-authors

Last years publications

Works published during the Ph.D. View all publications in Porto@Iris

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