Anisotropic coherence lengths of YBa 2 Cu 3 O 7‐δ  from specific heat measurements near  T   c | Zendy

Schnelle W. | Zendy; Ernst P. | Zendy; Wohlleben D. | Zendy

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Anisotropic coherence lengths of YBa 2 Cu 3 O 7‐δ from specific heat measurements near T c

Author(s) -

Schnelle W.,

Ernst P.,

Wohlleben D.

Publication year - 1993

Publication title -

annalen der physik

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.009

H-Index - 68

eISSN - 1521-3889

pISSN - 0003-3804

DOI - 10.1002/andp.19935050202

Subject(s) - anisotropy , condensed matter physics , physics , coherence length , gaussian , coherence (philosophical gambling strategy) , crossover , specific heat , superconductivity , optics , quantum mechanics , artificial intelligence , computer science

We present a detailed analysis of high resolution measurements of the specific heat anomalies at the T c of three YBa 2 Cu 3 O 7‐δ ‐samples. The anomalies can be described by the sum of a mean field (MF) step and a contribution from gaussian fluctuations of the order parameter. These fluctuations are threedimensional (3D) near T c and show a crossover to 2D‐behaviour some K away from T c . By means of a Lawrence‐Doniach type description of the fluctuations we estimate the anisotropic coherence lengths ξ and ξ⊥. The values are consistent with data of the fluctuation contribution to the susceptibility above T c . We give data for Δ C MF and discuss the relevance of critical fluctuations. The influence of the oxygen content δ on the broadening and splitting of the transition is shown.

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