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Experimental aspects of Alpha, Beta angles distortion on superconductivity in 1111-type Iron-based superconductor | ||
| Journal of Interfaces, Thin Films, and Low dimensional systems | ||
| دوره 2، شماره 2، مرداد 2019، صفحه 157-165 اصل مقاله (1.26 M) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22051/jitl.2019.24394.1026 | ||
| نویسندگان | ||
| Vahid Daadmehr* ؛ Zahra Alborzi؛ Fatemeh Shahbaz Tehrani | ||
| Magnet & Superconducting Res. Lab., Department of Physics, Alzahra University, Tehran, 199389, I.R. Iran | ||
| چکیده | ||
| In this research, we aim to clarify the relationship between the structural distortion due to doping and the superconductivity existence in the FeAs4 structure. For this, we have prepared polycrystalline of NdFeAsO0.8F0.2, NdFeAs0.95Sb0.05O0.8F0.2 and Nd0.99Ca0.01FeAsO0.8F0.2 samples by one-step solid-state reaction method. The structural and electrical properties of the samples were characterized through the X-ray diffraction pattern and the 4-probe method, respectively. The XRD patterns, refined using the MAUD software and Rietveld’s method, have indicated formation of the tetragonal structure with the space group P4/nmm:2. The variation of the lattice structuralparameters for the NdFeAsO0.8F0.2 doping with Sb and Ca ions were obtained by the Rietveld refinement. The changes of bond lengths and the ⍺, β bond angles have been specified from the corresponding value of ⍺ and β regular FeAs4-tetrahedron with the Sb/As and Ca/Nd doping, where they affect the superconductivity existence. The α and β bond angles increase and decrease with the substitution of Sb/As and Ca/Nd doping, which leads to the contraction of the FeAs layer, and therefore the lattice parameter “c” decreases. The superconducting transition temperature was reduced from 56 K for NdFeAsO0.8F0.2 sample to 48 K and 46 K for Ca/Nd and Sb/As doping, respectively. It can be concluded from the structural and electrical properties that the superconducting transition temperature decreases with increasing the distortion of FeAs4-tetrahedron from the regular one. So, there is a relation between the structural properties and the superconductivity in the iron based superconductors-1111 regardless of the doping procedures. | ||
| کلیدواژه‌ها | ||
| Iron based superconductor؛ doping؛ superconductivity؛ transition temperature؛ bond length and angles of tetrahedron structure؛ FeAs4 tetrahedron | ||
| عنوان مقاله [English] | ||
| نمود تجربی تغییر زوایای آلفا و بتا در ابررسانایی ابررساناهای پایه آهن نوع 1111 | ||
| نویسندگان [English] | ||
| وحید دادمهر؛ زهرا البرزی؛ فاطمه شهباز طهرانی | ||
| گروه فیزیک، دانشکده فیزیک و شیمی، دانشگاه الزهرا، تهران، ایران | ||
| چکیده [English] | ||
| در این مقاله، با استفاده از روش واکنش حالت جامد یک مرحله ای پلی کریستالهای NdFeAsO0.8F0.2، NdFeAs0.95Sb0.05O0.8F0.2 و Nd0.99Ca0.01FeAsO0.8F0.2 تهیه شدند. خواص ساختاری و الکتریکی نمونه ها از طریق پراش اشعه ایکس و روش پروب چهار نقطه مشخص شدند. الگوهای XRD که با استفاده از نرم افزار MAUD و روش Rietveld تحلیل شده اند ساختار تتراگونال با گروه فضایی P4/nmm:2 را نشان می دهدند. تغییر پارامترهای ساختاری شبکه برای آلایش NdFeAsO0.8F0.2 با یونهای Sb و Ca با پالایش Rietveld حاصل شد. تغییرات طول و زاویه پیوند های ⍺ ، β از مقدار متناظر ⍺ و β در FeAs4 تتراهدرون منظم با بجانشینی ناخالصی Sb/As و Ca/Nd مشخص شده اند که بر دمای گذار ابررسانائی تاثیر می گذارند. دمای گذار ابررسانائی به ترتیب 56 کلوین برای نمونه NdFeAsO0.8F0.2به 48 و 46 کلوین به ترتیب برای آلایش Ca/Nd و Sb/As کاهش یافت. از نتایج مطالعات ما در مورد خواص ساختاری و الکتریکی می توان نتیجه گرفت که دمای گذار ابررسانایی با افزایش اعوجاج زوایا از حالت منظم تتراهدرون FeAs4 کاهش می یابد. بنابراین، ارتباطی بین خواص ساختاری و ابررسانایی در ابررساناهای پایه آهن نوع 1111 بدون در نظر گرفتن نوع آلایشهای متفاوت وجود دارد. | ||
| کلیدواژه‌ها [English] | ||
| ابررسانای پایه آهن, آلایش, دمای گذار ابررسانائی, طول و زاویه های پیوند ساختار تتراهدرون, تتراهدرون FeAs4 | ||
| مراجع | ||
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