Abstract.
From measurements of the specific heat of \(\mathrm{NdBa_2Cu_3O_{6 + \mathnormal{x}}}\) in the temperature range between 20 K and 300 K the electronic contribution C e (T)/T has been derived. The results depend strongly on the assumptions made for the normal-state reference, especially the phonon contribution. Taking into account entropy conservation between the superconductor and a hypothetical normal-state reference, we found a temperature independent electronic contribution of this normal-state reference without any sign of a pseudogap for both optimum doped and underdoped samples. For oxygen concentrations between x = 0.79 and x = 0.89 a broad hump in C e (T)/T is observed around 120 K, which we ascribe to pair formation above T c . The dependence of the hole concentration n h in the copper oxide planes on the oxygen concentration x in the copper oxide chains was calculated by means of bond-valence sums. We found that the optimum doping of the copper oxide planes is n h,opt = 0.24 for \(\mathrm{\mathnormal{R}Ba_2Cu_3O_{6 + \mathnormal{x}}}\) (R = Nd, Y) irrespective of the element on the rare-earth site.
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Received: 17 September 2004, Published online: 5 November 2004
PACS:
65.40.Ba Heat capacity - 74.25.Bt Thermodynamic properties - 74.72.-h Cuprate superconductors (high-T c and insulating parent compounds)
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Tutsch, U., Schweiss, P., Wühl, H. et al. The electronic contribution to the specific heat of NdBa \(\mathsf{_2}\mathsf{Cu_3}\mathsf{O_{6 + x}}\) . Eur. Phys. J. B 41, 471–478 (2004). https://doi.org/10.1140/epjb/e2004-00340-5
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DOI: https://doi.org/10.1140/epjb/e2004-00340-5