Specific heat of praseodymium doped yttrium barium copper oxide

Sankar, N. ; Sankaranarayanan, V. ; Vaidhyanathan, L. S. ; Rangarajan, G. ; Srinivasan, R. ; Thomas, K. A. ; Varadaraju, U. V. ; Rao, G. V. Subba (1988) Specific heat of praseodymium doped yttrium barium copper oxide Solid State Communications, 67 (4). pp. 391-395. ISSN 0038-1098

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Related URL: http://dx.doi.org/10.1016/0038-1098(88)91051-4


The specific heat of samples of Y1-xPrxBa2Cu3O7-y for x = 0.1 to 0.5 has been measured from 4.5 to 65 K using a quasi-adiabatic calorimeter. A plot of C/T vs T2 shows a linear behavior below 20 K. The excess specific heat due to praseodymium in all the compounds is obtained by subtracting the specific heat of YBa2Cu3O7-x from the that of doped compound. The excess specific heat shows a peak near 19 K and its height decreases with increase in x. The excess specific heat could be interpreted on the basis of Schottky anomalies due to Pr3+ and Pr4+ ions, the peak at 19 K arising from the former. The fraction of Pr3+ ion obtained from a fit to the specific heat curves decreases from 0.30 for x = 0.1 to 0.05 for x = 0.5.

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