Calorimetric Investigation of NdBa2Cu3Ox Single Crystals

Details Calorimetric Investigation of NdBa2Cu3Ox Single Crystals Calorimetric Investigation of NdBa2Cu3Ox Single Crystals

1999-12-20

arxiv.org/abs/cond-mat/9912361v1

Physics

Condensed Matter

Superconductivity

5 pages with 2 figures, to be published in J. of Low Temp. Physics 117 (3/4) (1999)

Scientific paper

The specific heat of Nd(Y)Ba2Cu3Ox single crystals without substitution of Nd for Ba has been measured for various oxygen contents. In comparison with YBa2Cu3Ox, 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 Tc(x) dependences, the jump in the specific heat DeltaC/Tc 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 YBa2Cu3Ox accounting for the different behaviour of both systems.

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