2007/06/04 by T. Schneider, T Schneider · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Critical field #Crossover #Limiting #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetization #Physics of Superconductivity and Magnetism #Scaling #Superconductivity #Type-II superconductor #Vortex #cond-mat.supr-con
paper · pdf · doi:10.1209/0295-5075/79/57005
published in Europhysics Letters (EPL) 79(5), 57005 (Institute of Physics) · 4 pages, 5 figures
arxiv created 2007/06/04 · openalex publication_date 2007/08/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The effect of the magnetic field on the critical behavior of Sr 0.9 La 0.1 CuO 2 is explored in terms of reversible magnetization data. As the correlation length transverse to the magnetic field H i , applied along the i -axis, cannot grow beyond the limiting magnetic length L H i =(Φ 0 /( aH i )) 1/2 , related to the average distance between vortex lines, one expects a magnetic-field–induced finite-size effect. Invoking the scaling theory of critical phenomena we provide clear evidence for this effect. It implies that in type-II superconductors there is a 3D-to-1D crossover line H pi ( T )=(Φ 0 /( a ξ j 0 − ξ k 0 − ))(1- T / T c ) 4/3 with i ≠ j ≠ k and ξ i 0, j 0, k 0 − denotes the critical amplitude of the correlation length below T c . Consequently, below T c and above H pi ( T ) superconductivity is confined to cylinders with diameter L H i (1D). Accordingly, there is no continuous phase transition in the ( H , T )-plane along the H c 2 -lines as predicted by the mean-field treatment.