Thermodynamic fluctuations in -phase SmLa0.8Sr0.2CuO4−δ single crystal
| Autor: | Agustinus Agung Nugroho, R. Sutarto, Inge Magdalena Sutjahja, May-On Tjia, A.A. Menovsky, D. Darminto, J.J.M. Franse |
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| Rok vydání: | 2002 |
| Předmět: |
Physics
Condensed matter physics Field (physics) Energy Engineering and Power Technology Thermal fluctuations Thermodynamics Landau quantization Condensed Matter Physics Electronic Optical and Magnetic Materials Crystal Magnetization Condensed Matter::Superconductivity Ginzburg–Landau theory Electrical and Electronic Engineering Single crystal Scaling |
| Zdroj: | Physica C: Superconductivity. 369:291-294 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/s0921-4534(01)01261-8 |
| Popis: | Series of M – T measurements have been conducted on the T ∗ -phase SmLa 0.8 Sr 0.2 CuO 4− δ single crystal ( T c on ≈24 K) in a broad range of magnetic field (1000 Oe–10 kOe) applied along the crystal c -axis. The result clearly establishes the existence of a crossing point (M ∗ , T ∗ ) , signifying an intrinsic thermal fluctuations effect in this system. The effective CuO 2 interlayer distance deduced from this analysis is s ≈15.50 A, in a good agreement with the XRD refinement result. The effective dimensionality of fluctuations associated with the thermodynamic scaling properties of magnetization is analyzed on the basis of Ginzburg–Landau (GL) theory with the order parameter restricted to the lowest Landau level (GL-LLL) as well as the XY fluctuations model. It is shown that the data for the field above or equal to 8000 Oe exhibit distinct scaling behavior characteristic of the 2D GL-LLL fluctuation model. It also shows a clear departure from this and the corresponding 3D model in the lower field regime considered in this work. |
| Databáze: | OpenAIRE |
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