Doping dependent metal to insulator transition in the (Bi,Pb)-2212 system: The evolution of structural and electronic properties with europium substitution
Shabna Razia, Sarun Pallian Murikoli, Vinu Surendran, and Syamaprasad Upendran†
National Institute for Interdisciplinary Science and Technology (CSIR), Trivandrum, India-695019
Abstract The present work investigates the effect of europium substitution on the (Bi, Pb)-2212 system in the concentration range 0.5 ≤ x ≤ 1.0. Phase analysis and lattice parameter calculations on the powder diffraction data and the elemental analysis of EDX show that the Eu atoms are successfully substituted into the (Bi, Pb)-2212 system. Resistivity measurements (64--300 K) reveal that the system exhibits superconductivity at x ≤ 0.5 and semiconductivity at x > 0.5. With the complete suppression of superconductivity which is known to be a quasi-two dimensional phenomenon in these materials, a metal to insulator transition takes place at x=0.6 and the predominant conduction mechanism is found to be variable range hopping between localized states, resulting in macroscopic semiconducting behaviour. The results of electrical and structural properties of the doped (Bi, Pb)-2212 compounds suggest that the decrease of charge carrier concentration and the induced structural disorder are the more effective and dominant mechanisms in the origin of the metal to insulator transition and suppression of superconductivity due to Eu substitution at its Sr site.
Received: 19 September 2008
Revised: 02 April 2009
Accepted manuscript online:
PACS:
74.62.Dh
(Effects of crystal defects, doping and substitution)
Fund: Project supported by Kerala State
Council for Science, Technology and Environment, Council of
Scientific and Industrial Research and the University Grants
Commission of India.
Cite this article:
Shabna Razia, Sarun Pallian Murikoli, Vinu Surendran, and Syamaprasad Upendran Doping dependent metal to insulator transition in the (Bi,Pb)-2212 system: The evolution of structural and electronic properties with europium substitution 2009 Chin. Phys. B 18 4000
[1]
Effects of preparation parameters on growth and properties of β-Ga2O3 film Zi-Hao Chen(陈子豪), Yong-Sheng Wang(王永胜), Ning Zhang(张宁), Bin Zhou(周兵), Jie Gao(高洁), Yan-Xia Wu(吴艳霞), Yong Ma(马永), Hong-Jun Hei(黑鸿君), Yan-Yan Shen(申艳艳), Zhi-Yong He(贺志勇), and Sheng-Wang Yu(于盛旺). Chin. Phys. B, 2023, 32(1): 017301.
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.