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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.