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A comparison of high-T c superconductors: Specific heat in magnetic fields at very low temperatures

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Zeitschrift für Physik B Condensed Matter

Abstract

We discuss specific-heat,C(T), results on YBa2Cu3O7−δ(δ=0.13, 0.99) and Bi2Sr2CaCu2O8. For completion, we compare these with literature data on La1.85Sr0.15CuO4 and La2CuO4 by emphasizing the data at lowest temperatures,T≦0.45K. The strong upturn inC(T)/T found atB=0 is predominantly associated with a splitting of nuclear states by quadrupolar interactions. The shift of this upturn towards higher temperatures, when magnetic fields up to 8 T are applied, indicates additional hyperfine splitting. For YBa2Cu3O6.87 and Bi2Sr2CaCu2O8, subtraction of the nuclear specific heat from the raw data reveals a spin-glass derived contribution γ*(T,B), with γ* being strongly depressed upon both warming and applying externalB-fields. The probable source for γ* T are impurity phases (in YBa2Cu3O7−δ) and/or frustrated Cu2+ moments created by lattice defects. Any intrinsic linear specific heat, γi, due to, e.g., spinon excitations or normal electronic carriers, would have to imply γi<1 mJ/K2 molef.u. for each of these two compounds.

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Authors and Affiliations

  1. Institut für Festkörperphysik, Technische Hochschule Darmstadt, Hochschulstrasse 8, D-6100, Darmstadt, Federal Republic of Germany

    R. Caspary, M. Winkelmann & F. Steglich

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  1. R. Caspary
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  2. M. Winkelmann
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  3. F. Steglich
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Dedicated to Prof. Dr. G. von Minnigerode on the occasion of his 60th birthday

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Caspary, R., Winkelmann, M. & Steglich, F. A comparison of high-T c superconductors: Specific heat in magnetic fields at very low temperatures. Z. Physik B - Condensed Matter 77, 41–45 (1989). https://doi.org/10.1007/BF01313617

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  • DOI: https://doi.org/10.1007/BF01313617

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