Abstract
At the very beginning of the studies on high-Tc oxides, results of our tunneling experiments /1/ suggested that the rough features of the high-Tc superconductivity could still be described by the BCS’s universal theory. The superconducting coherence lengths of (La1-xMx)2CuO4 (M=Sr and Ba) crystals estimated from the upper critical magnetic field /2/ also suggested that the mean field description should at least approximately be valid even for the surprisingly high value of their transition temperatures. It meant that the superconducting behaviors did not essentially depend on the detailed origin(s) of the electron-electron pairing force and therefore did not easily give the useful clue to elucidate the mechanism of the superconductivity. Then, we felt it quite important to carry out detailed and careful studies not only on the superconducting state but also on the normal state. Much effort to prepare large single crystals of (La1-xSrx)2CuO4 and YBa2Cu3O7-δ has been made /3,4/ and the obtained crystals have been used by ourselves or in collaboration with many other groups in various kinds of experiments, transport studies /5/, Raman scattering /6/, neutron scattering /7–9/ and so on. However, for certain experiments where the oxygen number should be well controlled, powder specimens are realized to be much more suitable than single crystal specimens.
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After writing this paper, I learned the result obtained by J.D. Axe et al. /28/. Their preprint discussed the structure of (Lag0.95Ba0.05)2CuO4 below the structural transition at about 60K.
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Sato, M. et al. (1989). Recent Experimental Studies on High-Tc Oxides at IMS. In: Kamimura, H., Oshiyama, A. (eds) Mechanisms of High Temperature Superconductivity. Springer Series in Materials Science, vol 11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74407-5_28
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