Abstract
Measurement of the linear thermal expansionα has been carried outfor Mn substituted YBa2(Cu1−xMnx)3Oy (0≤x≤2%) using a high resolution dilatometer over the temperature range 10–300 K. Across thesuperconducting transition, the jump in the coefficient of linear thermal expansionΔα was found to decrease with increasing Mn content. For the puresample, we observed a negative jump. While a threefold decrease inΔα with x = 0.5% was observed, only slight changes in the oxygen content and transition temperature havebeen noted, as a function of the Mn concentration. The above observations clearly suggestthat the substituent Mn is being incorporated into the superconductors as a whole and notin the form of a local cluster. Further, from the Ehrenfest relations, the pressure dependence ofTC (dTC/dP) and the discontinuity in the compressibility,ΔK, are expected to decrease with the Mn concentration.
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