Abstract
Since the time that YBa2Cu3Ox (YBCO) was found to be a superconductor, numerous studies of the synthesis of its ceramics, growth of its single crystals, and investigation of their superconducting properties have appeared. At present, YBCO is the most widely studied high-T c superconductor (HTSC). However, LnBa2Cu3Ox; (where Ln are rare earths from lanthanum to lutetium) belong to the same group of HTSC and have been studied much less, mainly because most of them have the same superconducting properties as YBCO (transition temperature 90 K or slightly less, depending on the preparation conditions).1 However, other properties of LnBa2Cu3Ox are also highly dependent on Ln. In particular, the crystal lattice dynamics change if one rare earth is replaced by another. Additional information on the mechanisms of high-temperature superconductivity may be gained by investigating the resulting effects. Prom this viewpoint, LnBa2Cu3Ox are definitely interesting.
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