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Microstructural model of La2−xSrxCuO4 and the nature of “1/8”-anomaly

✍ Scribed by Olga Ivanenko; Kirill Mitsen

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
193 KB
Volume
460-462
Category
Article
ISSN
0921-4534

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✦ Synopsis

The microstructural model of La 2Àx Sr x CuO 4 based on coexistence of microdomains with distinctive types of long-range doped hole ordering is proposed. It is shown that the regions of bulk superconductivity coincide with the existence areas of two types of domain in which the percolation over negative-U center (NUCs) takes place and the deep of T c at x $ 1/8 falls on the narrow area (0.11 < x < 0.12) where the percolation over NUCs is impossible.

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The anomaly of the specific heat of La2-xSrxCuO4+δ near Tc
✍ P. Ernst; W. Schnelle; M. Breuer; R. Borowski 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 353 KB

## Abstract 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 fie