Experimental observation of two-dimensional fluctuation magnetization in the vicinity of Tc for low values of the magnetic field in deoxygenated YBa2Cu3O7−x
Year: 2006
Type: article
Abstract: We have measured isofield magnetization curves as a function of temperature in two single crystals of deoxygenated $\mathrm{YBaCuO}$ with ${T}_{c}=52$ and $41.5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Isofield magnetization curves were obtained for fields running from 0.05 to $4\phantom{\rule{0.3em}{0ex}}\mathrm{kOe}$. The reversible region of the magnetization curves was analyzed in terms of a scaling proposed by Prange, but searching for the best exponent $\ensuremath{\upsilon}$. The scaling analysis carried out for each data sample set with $\ensuremath{\upsilon}=0.669$, which corresponds to the three-dimensional-$xy$ exponent, did not produced a collapsing of curves when applied to $M$ vs $T$ curves data obtained for the lowest fields. The resulting analysis for the Y123 crystal with ${T}_{c}=41.5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, shows that lower field curves collapse over the entire reversible region following Prange's scaling with $\ensuremath{\upsilon}=1$, suggesting a two-dimensional behavior. It is shown that the same data obeying Prange's scaling with $\ensuremath{\upsilon}=1$ for crystal with ${T}_{c}=41.5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, as well as low field data for crystal with ${T}_{c}=52\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, obey the known two-dimensional scaling law obtained in the lowest-Landau-level approximation.
Source: Physical Review B
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2020172595