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Superconductivity and Magnetism in R 2CaBa2Cu5O z (R=La, Pr, Nd and Eu) |
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| Authors: | Kiran Singh Wilfried Hermes Som Datta Kaushik Sarkarainadar Balamurugan Shovit Bhattacharya Neeraj Kumar Gaur Sudhindra Rayaprol Rainer Pöttgen |
| Affiliation: | 1. Department of Physics, Barkatullah University, Bhopal, 452 001, India 2. Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Corrensstrasse 30, 48149, Münster, Germany 3. UGC-DAE Consortium for Scientific Research, R-5 Shed, B.A.R.C Campus, Trombay, Mumbai, 400 085, India 4. Technical Physics and Prototype Engineering Division, B.A.R.C, Mumbai, 400 085, India |
| Abstract: | A series of compounds R 2CaBa2Cu5O z (R=La, Pr, Nd and Eu) have been synthesized by conventional solid state reaction and characterized for their structural, superconducting and magnetic properties. All compounds crystallize with the tetragonal LaBa2Cu3O z type structure, space group P4/mmm. Among the four compounds studied here, R=La, Nd and Eu are superconductors with superconducting transition temperatures (T c R=0) of 72, 40 and 55 K, respectively. On the other hand, neither superconductivity nor magnetic ordering is seen for R=Pr down to 3 K. The effect of the magnetic field on the susceptibility and (magneto) resistance for the superconducting samples has been investigated. The superconductivity of compounds with magnetic rare-earth ions Nd and Eu exhibit a profound influence of the magnetic field, whereas the application of the magnetic field has a limited effect on the La compound. The Pr compound is paramagnetic and does not exhibit magnetic ordering either. |
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