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摘要
The magnetization vector (M) over right arrow was measured in the reversible region of the mixed state of a high-quality Tl(2)Ba(2)Ca(2)Cu(3)O(10) single crystal as a function of temperature and for different magnetic field amplitudes and orientations. These measurements allowed to study the (M) over right arrow components perpendicular and parallel to the CuO(2) layers (M(perpendicular to) and M(parallel to), respectively) under arbitrary values for the corresponding components of the applied magnetic field, H(perpendicular to) and H(parallel to). For temperatures close to T(c) (in the critical fluctuation region), we observed M(perpendicular to)(H(perpendicular to), H(parallel to)) approximate to M(perpendicular to)(H(perpendicular to), 0) and M(parallel to)(H(perpendicular to), H(parallel to)) approximate to 0, as expected for an extremely anisotropic material. However, deviations from this behavior are observed at lower temperatures in the London region. In particular, the M. amplitude under a constant H(perpendicular to) decreases on increasing H(parallel to). In turn, in spite of the experimental uncertainties affecting M(parallel to) (mainly associated with the rotating sample holder), its amplitude under a constant H(parallel to) becomes observable on increasing H(perpendicular to). Both effects lead to an angular slippage of the magnetization vector (M) over right arrow from the c crystallographic axis when the applied magnetic field is tilted from that axis. The M(perpendicular to) behavior is phenomenologically explained in the framework of Lawrence-Doniach approaches for single layered superconductors by just assuming a slight angular dependence of the so-called vortex structure constant. However, the observed M(parallel to) is orders of magnitude larger than expected, a fact that is related to the multilayered nature of the compound studied.
- 出版日期2011-10-5
