Abstract
The specific heat of Nd(Y)Ba 2 Cu 3 O x single crystals without substitution of Nd for Ba has been measured for various oxygen contents. In comparison with YBa 2 Cu 3 O x , the maximum attainable transition temperature of the crystals is about 4 K higher and shifted from x = 6.92 to x = 7.0, the highest possible oxygen content. In spite of the difference in the T c (x) dependences, the jump in the specific heat ΔC/T c at T c in both systems increases continuously being maximum at x = 7.0. Bond valence sum calculations based on neutron diffraction data point to a retarded generation of holes with increasing oxygen content in the Nd system and a different hole distribution between the chains and the planes in comparison to YBa 2 Cu 3 O x accounting for the different behaviour of both systems.
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Tutsch, U., Schweiss, P., Hauff, R. et al. Calorimetric Investigation of NdBa2Cu3Ox Single Crystals. Journal of Low Temperature Physics 117, 951–955 (1999). https://doi.org/10.1023/A:1022519411755
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DOI: https://doi.org/10.1023/A:1022519411755