New vortex-matter size effect observed in Bi(2)Sr(2)CaCu(2)O(8 + delta) |
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| Authors: | Wang Y M Fuhrer M S Zettl A Ooi S Tamegai T |
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| Institution: | Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA. |
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| Abstract: | The vortex-matter 3D to 2D phase transition is studied in micron-sized Bi(2)Sr(2)CaCu(2)O(8 + delta) single crystals using local Hall magnetization measurements. At a given temperature, the second magnetization peak, the signature of a possible 3D--2D vortex phase transition, disappears for samples smaller than a critical length. We suggest that this critical length should be equated with the 2D vortex lattice ab-plane correlation length R(2D)(c). The magnitude and temperature dependence of R(2D)(c) agree well with Larkin-Ovchinnikov collective pinning theory. |
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