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Micro-Calorimetric Study of Iron-Based Superconductor BaFe2(As(1-x)P(x))2
thesis
posted on 2013-05-28, 00:00 authored by Carlos ChaparroIn this thesis I present the specific heat measurements on a series of BaFe2(As1-xPx )2 single crystals with phosphorous doping ranging from near optimum doped x = 0.3 to strongly overdoped x = 0.55. These samples can be made with very high purity, the concentration of phosphorous was determined by x-ray energy dispersive spectra (EDS). A systematic study of the superconducting specific heat transitions reveal that BaFe2(As(1-x)P(x))2 follows the scaling ??C/Tc ?? Tc2 remarkably well. It is the first member of the iron-based layered superconductors that follows this particular trend called the BNC (Bud??ko, Ni, and Canfield) scaling of the specific heat transition. The clean-limit nature of this material imposes additional restraints on theories aimed at explaining the BCN scaling since models based on specific electron scattering mechanisms appear to be inconsistent with our results. Furthermore, we find the superconducting anisotropy is ?? ?? 2.6, independent of doping, indicative of the dominating role of the electron Fermi surface sheets in forming the superconducting state.
History
Date Modified
2017-06-05Defense Date
2013-05-07Research Director(s)
Morten R. EskildsenCommittee Members
Ulrich Welp Wai KwokDegree
- Doctor of Philosophy
Degree Level
- Doctoral Dissertation
Language
- English
Alternate Identifier
etd-05282013-190241Publisher
University of Notre DameProgram Name
- Physics
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