Investigation of superconducting fluctuations and pseudogap in high temperature superconductors microwave method

Grbić, Mihael Srđan (2011) Investigation of superconducting fluctuations and pseudogap in high temperature superconductors microwave method. Doctoral thesis, Faculty of Science > Department of Physics.

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Abstract

We study the response of superconducting fluctuations by microwave absorption technique, above the transition temperature (Tc) in three families of cuprates - YBa2Cu3O6+x, HgBa2CuO4+δ and La2−xSrxCuO4. From the calculated values of σab(c) with and without applied magnetic field we determine the temperature span of fluctuations ab(c)T′. The doping dependence of ab(c)T′(p) and the implications of the measured data are discussed. Obtained results are compared with current theoretical and experimental findings on superconducting fluctuations and pseudogap. Within the scope of the thesis we calculated the electromagnetic field distributions of our resonating cavity, magnetic field distribution in an infinite rectangular anisotropic rod, and developed a numerical model for one−dimensional nonlinear heat propagation. Also, new parts of the measurement setup were made to ensure a better stability of the measurement process, and earlier measurements of Bi2Sr2CaCu2O8+δ were analyzed.

Item Type: Thesis (Doctoral thesis)
Keywords: microwave absorption ; high temperature superconductors ; penetration depth ; fluctuations ; conductivity ; Boltzmann equation ; cuprates ; modes ; resonating cavity ; heat equation ; heat distribution
Supervisor: Požek, Miroslav
Date: 2 February 2011
Number of Pages: 145
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 08 Dec 2013 13:27
Last Modified: 02 Jan 2014 10:53
URI: http://digre.pmf.unizg.hr/id/eprint/12

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