The anomaly of the specific heat of La 2‐x Sr x CuO 4+δ  near  T   c | Zendy

Ernst P. | Zendy; Schnelle W. | Zendy; Breuer M. | Zendy; Borowski R. | Zendy

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The anomaly of the specific heat of La 2‐x Sr x CuO 4+δ near T c

Author(s) -

Ernst P.,

Schnelle W.,

Breuer M.,

Borowski R.

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.19935050203

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

The specific heat of three polycristalline samples of La 2‐x Sr x CuO 4+δ (x = 0.15, 0.15, 0.16) near T c was measured with a resolution better than 0.1%. The anomaly at T c is analysed for fluctuations for the first time. It is well described by a superposition of a mean field step and a contribution due to gaussian fluctuations. By a fit of a Lawrence‐Doniach type of model to the specific heat near T c we estimate Δ C MF and the anisotropic coherence lengths ξ and ξ⊥ of the superconductor.

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