| 摘要(英) |
LaOFeAs₁-xPx is one of the iron-based superconductor with layer structure. We studied the effects of P-doping and temperature on the structure and charge distribution of iron-based superconductor LaOFeAs₁-xPx (x=0.4-0.56). By refining X -ray diffraction and neutron diffraction patterns with General Structure Analysis System (GSAS) program, we could get the information of structure and the distribution of charge density after using fourier transform.
In our study, the lattice constants decrease as the P-doping increase at room temperature. The thickness in the Fe-As layer and the P-doping are not directly related, and the bond length and bond angles are not either. The lattice constants decrease as the temperature decrease. The max variation in three samples (x=0.4, 0.44, 0.48) of lattice constants form 3 K to 350 K is about 0.3%.
There is the same trend of the charge distribution at 75 K, 195K and room temperature between three samples (x=0.4, 0.44, 0.48). The trend is that the charge between Fe-As layer and La-O layer will increase. The shift of charge may bring about growth and decline of magnetic. |
| 參考文獻 |
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