Magnetization measurements on high-quality single crystals of (Formula presented)-(Formula presented)Cu(Formula presented) [where BEDT-TTF denotes bis(ethylenedithio)tetrathiafulvalene] are performed in the magnetic field perpendicular to the conducting layers. An anomalous second peak on magnetization curves observed at (Formula presented) (≈ 150 Oe) is attributed to the dimensional crossover in the vortex system. At the dimensional crossover field (Formula presented), the temperature dependence of the irreversibility field changes from the power-law dependence in the three-dimensional (3D) regime below (Formula presented) to the exponential dependence with (Formula presented) in the quasi-2D regime above (Formula presented). It is also found that the different magnetic field dependence of the critical current density above and below (Formula presented) is well described by the collective pinning theory.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1996 Jan 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics