Influence of Dysprosium Addition on the Phase Formation and Transport Properties of Hg-1223 Superconductor
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ORIGINAL PAPER
Influence of Dysprosium Addition on the Phase Formation and Transport Properties of Hg-1223 Superconductor I. R. Metskhvarishvili 1,2 & G. N. Dgebuadze 1 & T. E. Lobzhanidze 3 & B. G. Bendeliani 1,2 & M. R. Metskhvarishvili 2 K. P. Giorgadze 3 & V. M. Gabunia 1,4
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Received: 1 May 2020 / Accepted: 29 July 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract We study the influence of dysprosium (III) oxides on the superconductivity properties of Hg-1223 material. Dysprosium-free Hg1223 and dysprosium-doped HgBa2Ca2Cu3DyxO8+δ (x = 0.00–0.075 wt%) superconductors are synthesized by sealed quartz tube technique. Our results demonstrate that a presence of dysprosium oxide not only makes the Ba2Ca2Cu3Oy multiphase precursor more reactive and enhances the kinetics of the reaction, but also leads to the promotion of the high-Tc phase and enhancement of the transport critical current densities Jc. Keywords Hg-1223 . Dysprosium (III) oxides . Critical current . ac susceptibility . High harmonics
1 Introduction The Hg-1223 phase of the mercury system superconductors generates a considerable interest because only this system sets a record in transition temperature in superconductivity state at Tc ≈ 135 K [1, 2] and Tc ≈ 165 K under high pressures of 30 GPa [3–5]. Consequently, this property makes the Hg1223 phase an attractive material for its practical utilization. Preparation of Hg-based superconductor materials is multistage and labor-consuming. Firstly, in order to obtain the superconducting Hg-1223 phase with optimal properties, the characteristics of the Ba2Ca2Cu3Oy multiphase precursor are critical. An important characteristic is a degree of homogeneity of existing cations [6] and oxygen content [7] in the * I. R. Metskhvarishvili [email protected] 1
Department of Cryogenic Technique and Technologies, Ilia Vekua Sukhumi Institute of Physics and Technology, Mindeli str. 7, 0186 Tbilisi, Georgia
2
Faculty of Informatics and Control Systems, Georgian Technical University, Kostava str. 77, 0175 Tbilisi, Georgia
3
Department of Chemistry, Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, Chavchavadze Ave. 3, 0179 Tbilisi, Georgia
4
Petre Melikishvili Institute of Physical and Organic Chemistry of the Iv. Javakhishvili Tbilisi State University, Jikia str 5, 0186 Tbilisi, Georgia
precursor. The second problem of the Hg-1223 synthesis is that the HgO has relative instability and low decomposition temperatures and dismisses on O2 gas and Hg steam in the process of syntheses and sintering. In this case, if a metallic ion is substituted partially by a higher valence ion, the Hg1223 phase can be stabilized and its superconducting behavior is improved. Many research works have been devoted to substitutions or additions of elements with cations Re+4, Sb+3, Pb+4, and Tl+3 having oxidation states higher than Hg+2 [8–19]. In addition, like other high-temperature superconductors, Hg-based superconductors have weak bonds and weak flow anch
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