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Study of Superconductivity of [Mg(B1-xCx)2]0.97 Cu0.03 and Doping Choice of Rare-earth Iron Oxyarsenide

Author: WeiGuiDan
Tutor: SunAiMin
School: Northwest Normal University
Course: Condensed Matter Physics
Keywords: MgB2 Doping Lattice constant Transition temperature Valence orbit average energy Iron-based arsenide Superconducting transition temperature
CLC: O511
Type: Master's thesis
Year: 2010
Downloads: 13
Quote: 0
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Abstract


This paper first introduces the development of superconductivity research and the basic theory of superconductivity , and MgB 2 and LaOFeAs basic properties and Research . Next comes the electronegativity and valence orbit average energy -related knowledge . Finally, this paper introduces the following two aspects of the research work : 1, C, Cu doped MgB 2 superconductivity effects , the use of solid-phase sintering prepared a series of carbon (C) , copper (Cu) -doped magnesium diboride (MgB 2 ) samples, and samples for detailed analysis . X-ray diffraction shows that with the increase in the amount of C-doped c-axis lattice constant is almost unchanged , a -axis lattice constant decreases slightly , which estimated the actual substitution of C , suggesting that this condition C in MgB 2 solubility at 12.5 % and 15 %, respectively. Variation of resistance with temperature (RT) indicates the amount of Cu doped determined, the transition temperature (Tc) with the doping concentration of C increases. 2 , we study currently arsenide doped iron-based atomic valence orbit average energy and the relationship between superconductivity and found all the cations and anions valence orbital average of the average energy focused on 11.407eV-11.705eV between the cation and anion valence orbital energy of the average of the average absolute difference mainly in 8.446eV-8.869eV between the average effect by the relationship with the transition temperature inferred current arsenide doped with iron base has not reached the optimum superconducting state. This will help to understand the lattice electrons electrostatic interaction between the superconducting mechanism , and later arsenide doped iron-based study has certain guiding significance.

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CLC: > Mathematical sciences and chemical > Physics > Low Temperature Physics > Superconductivity
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