Raman scattering in the high Tc superconductors MBa2Cu3O7-x |
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| Institution: | 1. School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, 4000, South Africa;2. Department of Applied Chemistry, Doornfontein Campus, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa;1. College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, PR China;2. School of Chemistry and Environmental Science, Xiangnan University, Chenzhou, 423043, PR China;3. College of Science, Northwest A&F University, Yangling, Shaanxi, 712100, PR China;4. Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application, Xiangnan University, Chenzhou, 423043, PR China;5. College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, Hubei, 443002, PR China;1. Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Krakow, Poland;2. The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Science, ul. Radzikowskiego 152, 31-342 Krakow, Poland;3. AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, 30-055 Kraków, Poland;4. National Synchrotron Radiation Centre Solaris, Jagiellonian University, 30-392 Kraków, Poland;5. Elettra Sincrotrone Trieste, Strada Statale 14 - km163.5, in AREA Science Park, 34149 Basovizza, Italy |
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| Abstract: | We report Raman scattering measurements of MBa2Cu3O7 (M = Y, Sm, Eu) polycrystalline superconductors in the region of Cu-O stretching vibrations. Four peaks are seen. On the basis of the factor group analysis given here they are assigned to two Raman allowed and two ir-allowed LO modes. The latter are probably induced by disorder (e.g. O-vacancies). |
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