Thermodynamic fluctuations in T(*)-phase SmLa0.8Sr0.2CuO4-δ single crystal

I. M. Sutjahja*, D. Darminto, R. Sutarto, A. A. Nugroho, M. O. Tjia, A. A. Menovsky, J. J.M. Franse

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Series of M-T measurements have been conducted on the T(*)-phase SmLa0.8Sr0.2CuO4-δ single crystal (Tcon≈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 CuO2 interlayer distance deduced from this analysis is s≈15.50 Å, 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.

Original languageEnglish
Pages (from-to)291-294
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Issue number1-4
Publication statusPublished - 15 Mar 2002


  • Crossing point
  • GL-LLL theory
  • Magnetization
  • SmLaSrCuO single crystal
  • Thermodynamic scaling


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