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PubbliTesi - La Tesi
Conductivity study in a ion-beam fabricated structure of YBCO superconductor
Scheda Sintetica
Autore: Marco De La Pierre
Relatore: Marco Truccato
Università: Università degli Studi di Torino
Facoltà: Facoltà di Scienze Matematiche, Fisiche e Naturali
Corso: Laurea Spec. in Scienza dei Materiali
Data di Discussione: 26/10/2007
Voto: 110 cum laude
Disciplina: Fisica dello Stato Solido
Tipo di Tesi: Sperimentale
Lingua: Inglese
Grande Area: Area Scientifica
Dignità di Stampa: Si
Settori Interessati: elettronica: sensori di campo magnetico SQUID
Descrizione:
This thesis deals with a whisker sample made up of the high-temperature superconductor YBCO. The first aim is to investigate whether the paraconductivity behaviour for this material can be accounted for by means of the model proposed by A.I.Larkin and A.A.Varlamov in the framework of the Ginzburg-Landau theory. Concerning this issue, estimates for the microscopic parameters introduced by the model have also been obtained. The second aim is to study how the elecrical properties of the YBCO whisker modify when reducing its cross-section area by means of a Focused Ion Beam device, from about 77 micron^2 to about 4 micron^2, over a length of about 150 micron. In this respect, a deep analysis has been carried out for the geometrical and morphological effects induced by the FIB etching.