Far infrared optical properties of high Tc superconductors LnBa2Cu3Ox (Ln=Y, Ho, Er, Sm, GD, Dy, Eu, Pr) |
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| Authors: | S Onari T Hiroaki A Ono S Hidaka T Arai and T Mori |
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| Institution: | (1) Institute of Applied Physics, University of Tsukuba, 305 Tsukuba, Japan;(2) Department of Electrical Engineering, Ibaraki National College of Technology, Nakane Fukayazu, 866 Katsuta, Japan |
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| Abstract: | Systematic measurements of the far infrared reflection spectra of high Tc superconductors LnBa2Cu3Ox for various Ln as shown in the title were performed. Infrared reflection spectra of tetragonal LnBa2Cu3Ox exhibit Reststrahlen vibration near 640, 590, 530, 355 and 250 cm–1, common to these materials, and the spectra of the orthorhombic LnBa2Cu3Ox exhibit the characteristics of free carriers except PrBa2Cu3Ox with weak phonon structures near 617, 570, 317 and 285 cm–1. PrBa2Cu3Ox is not a superconductor, and it has no characteristic broad band due to free carriers for all x in the range of 6 to 7. Lattice dynamical calculation was performed by the use of the shell model and the calculated results express quite well the characteristic features of infrared experiments. |
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